07 connection to the process v1.00_en

PCS 7 System Course
SIMATIC PCS 7 – Connection to the process
Training Documentation, V1.00, ST-PCS7SYS 7 - 1
Content 7
7 Connection to the process .....................................................................................3
7.1 Learning Targets.....................................................................................................................3
7.2 Component View and Plant View ...........................................................................................4
7.2.1 Component View ....................................................................................................................4
7.2.2 Plant View...............................................................................................................................5
7.2.3 Assignments ...........................................................................................................................5
7.3 Task and Checkpoint..............................................................................................................6
7.4 Basics for charts and blocks...................................................................................................7
7.4.1 Device control functions..........................................................................................................7
7.4.2 Charts .....................................................................................................................................9
7.4.3 Catalog for libraries, blocks and charts ................................................................................11
7.4.4 Inserting a block into a chart.................................................................................................13
7.4.5 Block properties ....................................................................................................................14
7.4.6 I/O Properties........................................................................................................................15
7.4.7 Interconnections ...................................................................................................................15
7.4.8 Compile and Download.........................................................................................................16
7.4.9 Test mode.............................................................................................................................19
7.5 Organization blocks ..............................................................................................................20
7.6 Run Sequence ......................................................................................................................22
7.6.1 How to Adapt the Run Sequence .........................................................................................22
7.6.2 Runtime properties ...............................................................................................................24
7.6.3 Optimization of the Run sequence .......................................................................................24
7.6.4 Runtime properties for experts: Activating/Deactivating runtime groups..............................26
7.6.5 Runtime properties for experts: Switching runtime groups on and off during operation ......27
7.7 Different groups of blocks.....................................................................................................28
7.8 Driver Blocks.........................................................................................................................29
7.8.1 General .................................................................................................................................29
7.8.2 Digital Input and output.........................................................................................................30
7.8.3 Analog Input and Output.......................................................................................................30
7.8.4 Module drivers ......................................................................................................................31
7.8.5 Process Image Partitions......................................................................................................33
7.8.6 Symbolic Addresses .............................................................................................................35
7.8.7 Pcs7DiIn in brief....................................................................................................................36
7.8.8 Pcs7AnIn in brief...................................................................................................................37
7.9 Trend Display........................................................................................................................39
7.10 Dynamic Display ...................................................................................................................40
7.11 Task and Checkpoint............................................................................................................40
7.12 Connection to the Process simulation in this training...........................................................41
7.12.1 Method in this training...........................................................................................................41
7.12.2 Overview...............................................................................................................................42
7.12.3 Digital Inputs .........................................................................................................................43
7.12.4 Digital Outputs ......................................................................................................................44

PCS 7 System Course
7 - 2 Training Documentation, V1.00, ST-PCS7SYS
7.12.5 Analog Inputs........................................................................................................................45
7.12.6 Analog Outputs .....................................................................................................................45
7.13 Task and Checkpoint............................................................................................................46

PCS 7 System Course
7 Connection to the process
7.1 Learning Targets
The participant will learn about
• the use of the Component view and the
Plant view in a Multiproject
• The basics of charts and blocks and
how to work in the CFC editor
• The use of symbolic names to every IO
signal
• The features for testing IO signals
The participant will be able to
• Configure charts containing drivers to
all signals of the Signal Box,
representing some live process signals
• have the Johnssons process simulation
installed and tested as a preparation for
creating the automation functions to the
training application

PCS 7 System Course
7.2 Component View and Plant View
7.2.1 Component View
After opening and creating a project, its Component View will be displayed. All data will
be assigned to physical stations and components.
1
3
2
4
5
1. Stations
2. Subnet objects: only renaming is possible here.
3. Shared declarations contain the elements Enumerations, Units and Equipment
Properties. They can be used by several tools and editors.
4. S7 Program folder: it is recommended to assign a unique and proper name to
prevent mistakes when identifying the station using this name. Blanks are not
permitted.
5. Symbol table: for every S7 Program (every CPU, every AS) there exists a unique
symbol table, for storing the relation between Symbolic names and addresses or
block types.
 Stations and components are to be inserted first before data can be edited. Subnet
object are inserted here only, they are edited by HW Config and NetPro.

PCS 7 System Course
7.2.2 Plant View
For PCS 7, another view is important: the Plant View for displaying the Plant Hierarchy.
The Plant Hierarchy shows the hierarchical relationships of your plant (units, equipment
modules …) in a tree of hierarchy folders. The folder names have to identify the
components of the plant.
Different Representation of the Master data library
• In the component view: An S7 program with the folders for
− Source files
− Blocks
− Charts
− and one folder for shared declarations
• In the plant view: The folders for
− Process tag types
− Models
− Shared declarations
7.2.3 Assignments
Configurable objects like charts and pictures are created in the Plant View window of
the project. An assignment to a station in the Component View will organize its real
target station (AS or OS).

PCS 7 System Course
7.3 Task and Checkpoint
Task: Plant Hierarchy
Goal
The starting point of the Plant Hierarchy
Checkpoint
Compare …
• the arrangement of folders on your
ES to what is listed in this task.

PCS 7 System Course
7.4 Basics for charts and blocks
7.4.1 Device control functions
Every device in the plant will be represented by a chart with blocks in the engineering
station, and a block icon/faceplate on the operator station. Predefined blocks are
available in a library.
1
2
3
4
3
5
7
6
1. Drive in the plant
2. Chart in the engineering station
3. Block representing the drive
4. Controlling, monitoring, interlocking …
5. Control signal to the drive
6. Block type in the library
7. Operating and monitoring
The control of motors, valves and other process devices (process tags) in process
control systems is done by device control functions.
They offer the control, monitoring, operating from devices by supplying the connection
to control devices and their feedback. They also include parameter setting and
diagnosing faults.
Blocks
In modular designed user applications in process control software, device control
functions are realized by technological blocks. The inner side of these blocks is hidden
for the users.

PCS 7 System Course
Block types and block instances
Predefined device control functions are offered in process control libraries.
For example, the control of a motor can be done in PCS 7 using a motor block MOTOR
from the standard library or the MotL from the Advanced Process Library (APL).
They differ in the scope of control features and their graphical representation for
monitoring and controlling.
Block types:
•Type name
•Data interface (input and
output parameters)
•Algorithm
•Available in libraries
•Central management/update
in the Master Data Library
Block instances:
•Are generated from the block type
•Many block instances possible
•In chart connectable and parameterizable
•Central update of all instances with the
related block type
Instance data blocks:
•Created for every block instance
DB x DB y DB z

PCS 7 System Course
7.4.2 Charts
Charts are the placeholders of blocks. Each chart has a name that is unique within a
CPU. Charts will hold the blocks using a graphical representation in the CFC editor. In
general a chart contains several block, which are connected to each other.
Sheet view and navigation
Each chart consists of up to 26 chart partitions each with 6 sheets. You can see all of
the sheets in the Overview:
sheet 1
sheet 2
sheet 3
sheet 4
sheet 5
sheet 6
Overview
Sheets
chart partitions,
initially one,
can be A … Z
Sheet bar Sheet bar
Sheet view Pull down list to
select a sheet
Text box for
chart comments

PCS 7 System Course
• After inserting a new chart into the Charts folder, and opening, the chart starts with
one partition, containing 6 sheets.
• You can switch between the sheet view and overview by clicking the button in the
tool bar, or double click in a sheet (on the white background).
• As an alternative, you can use the pull down list.
• The sheet bars are used for references of connections outside of the sheet.
• Use the text box to enter a chart comment. You can position a text box in the chart
just like blocks.
CFC editor tool bar:
1
2
3
4
5
6
7
8
9
1. Show the CFC catalog
2. Show the chart I/O view
3. Show the run sequence view
4. Show the technological I/O view
5. Compile charts
6. Download the S7 program
7. Switch to the CFC test mode
8. Open the Chart Reference Data
9. Zoom in/out the sheet view

PCS 7 System Course
7.4.3 Catalog for libraries, blocks and charts
Using the toolbar button Catalog, you can toggle the display of the catalog.
3 tabs
3 tabs at the bottom separate the catalog into 3 areas:
1 2 3 4
1. Libraries, where preinstalled and later added libraries can be displayed. In this view
the block folder of the library shows its content. When each block is assigned to a
family, blue books represent the families. Libraries contain blocks of the type FB
and FC. In general blocks of the PCS 7 libraries are used.
2. A library may contain a subfolder “Templates”, displaying the available templates:
predefined charts for control functions.
3. Blocks, initially containing a series of blue books, representing the so called Basic
Operations of CFC. They origin from the use of CFC for PLC programming. In
general the content is not used for PCS 7.
During the progress of the configuration of an AS, more blue books will appear
here, containing the block types that are used in the AS charts, grouped into
families.
The folder at the bottom of the list (in this picture “AS08”) will contain the same
series of blocks that has been copied into the blocks folder of that AS because of
the use in the charts.
4. Charts, listing the charts present in the charts folder of the AS (not the system
charts). The opened blue folder represents the active chart in the CFC editor.

PCS 7 System Course
Templates
Templates are predefined charts for control functions. They are available in the chart
folder (called “Templates”) of the PCS 7 library.
They can be used in an application in different ways:
• by copying into a project (plant hierarchy folder) and the adjusting the signals and
parameters.
• by copying into the Master Data Library of a Multiproject. Then it is to be used as a so
called “Process Tag Type”. More details later.
 See [302] PCS 7 CFC for SIMATIC S7 - Function Manual - 04_2012, 7.2.2 for more
details

PCS 7 System Course
7.4.4 Inserting a block into a chart
When you insert a block in your CFC chart, you generate an instance of this block type.
In this context, “instance” refers to an instance of the selected block type.
1
2
3
Drag
4
Block
header
You can drag blocks from the catalog (library) into a chart. The installed blocks are
assigned to the OB where the Runtime Group of the chart belongs to (this example:
OB35).
1. Block name (name of a block instance): CFC assigns a number as a name to a
block instance when it appears in a chart. The name should be changed using the
Block Properties dialog window.
 The name has a maximum length of 16 characters and is displayed in the block
header. Illegal characters: / ." %.
Remember when assigning names that the variable name must not be longer than
128 characters for transfer to the OS. This includes not only the block name but also
hierarchy path, chart name, separator and I/O names.
2. Name of the block type: This name cannot be changed in the CFC Editor.
3. Block comment: The comment, a user-specific text, appears in the block header.
The block header can display up to 14 characters of comment. Small blocks do not
display the comment.
4. Predecessor for blocks: One block per chart will have a light green colored
Runtime properties area in the block header (instead of dark green). This indicated
the block is de predecessor block. A new inserted block for this chart will be
inserted behind it in the run sequence.

PCS 7 System Course
7.4.5 Block properties
General
1
2
4
3
1. After a double click in the block header, the Properties dialog window appears, with
the General tab opened.
2. The name field is preset by just a number. Usually it is replaced by a more useful
name.
3. The comment field is preset by a brief block description. It can be changed.
4. Some areas in this dialog window may not be valid for a block type. The objects are
grayed out then.
I/Os
A second tab lists the properties of the individual inputs and output:
2
3
1
1
2
1. Inputs of a block
2. Outputs of a block
3. Several settings, initially with their default values. White fields can be changed.

PCS 7 System Course
7.4.6 I/O Properties
1 2
3
1. After a double click on a block input field, the Properties dialog window of the input
will appear. When an input has been designed as a structure, first the Select
Structure Element window appears.
2. The I/O Properties dialog window is displayed.
3. The main field is the Value field. When there is no connection configured to this
input, a value can be assigned.
Other settings are explained later.
7.4.7 Interconnections
For transferring a value from a block output to a block input, an interconnection can be
configured.
In general:
• To make an interconnection, you can click at the output and then at the input (or in
opposite order).
• Alternative you can drag from the output to the input (or in opposite order).
• An output may have several connections to several inputs.
• An input can have only one connection to an output.

PCS 7 System Course
Display of instances with invisible interconnected block I/Os
Indicator for an invisible
block I/O still being
interconnected
If interconnected block I/Os are made invisible, this is shown in the instance header
using a cyan triangle.
7.4.8 Compile and Download
Data flow of configuring in CFC
After creating the required functions in the charts, they are to be send to the CPU:
CFC Editor
S7 User Programm
CFC Charts
Parameters
Block instances
Block types
Block library
Download
Machine code
S7 target system
Code generation
Compilation
SCL source Compile

PCS 7 System Course
Compile
1
2
1. The Compilation process converts the functions in the charts into blocks, and
stores them in the offline blocks folder.
2. With the Scope, you select if the program is to be compiled entirely (only option for
the first time) or with changes only (compared to an earlier compilation).
Download
2
1
1. With Download, the blocks are copied to the CPU.
2. With the Download mode, you select if the entire series of block are copied to the
CPU (only option for the first time) or only the changed (new) ones (compared to an
earlier download).

PCS 7 System Course
Compile and Download
When the download button is clicked, without performing a compilation beforehand, a
message box appears, prompting that you can do both in one session:
1
2
43
1. Click on the Download button
2. A message box prompts you about compilation
3. Check the settings for compilation
4. Check the settings for Download
What you should know about downloading changes
In cases where plants change during operation but must not be set to STOP mode
under any circumstances, the possibility of downloading changes to them must be
ensured.
 If you want to ensure that your program retains its ability to download changes, you
should generate a backup copy after each completed download.
 See [302] PCS 7 CFC for SIMATIC S7 - Function Manual - 04_2012, 11.3 and 11.4
for more details about the system support for avoiding causes of CPU STOP
Downloading a modified program to a test CPU
With the option "Download to test CPU" in the S7 download dialog, you can download a
changed program for testing to a different CPU or to PLCSIM. The ability to download
changes is not lost.

PCS 7 System Course
7.4.9 Test mode
General settings for blocks
1
4
3
2
1. Toggle button for Test mode
2. Watch cycle, minimum is 1 second.
3. Switch to Watching on mode for the whole block
4. Switch to Watching off mode for the whole block
• Process mode: After switching on the Test mode, all blocks are in Watching off
mode.
• Laboratory mode: After switching on the Test mode, all blocks are in Watching on
mode.
General settings for I/Os
When a value is not
displayed in test mode…
…use the „mouse over“ to
have an info box displayed
with the current value.
Or click on the right to
perform an Add I/O…
…to have the current value
displayed continuously.
You can also toggle the Watched status of a block I/O by “Ctrl + click”.
You can watch
and alter the
setting there
In fact you are controlling a setting in the I/O properties.

PCS 7 System Course
7.5 Organization blocks
Function Blocks (FBs) in a chart represent functions with a program. The program code
is to be executed in a regular way.
Organization Blocks (OBs) form the interface between the operating system of the CPU
and the application. Different OBs (numbers) can be used. To every OB belongs a
trigger from the operating system.
Blocks are to be assigned to at least one OB.
Every OB represents a Start Event, controlled by the operating system of the CPU.
Tasks
Our main group of OBs is the OB30s: OB30 … OB38.
They represent cyclic execution (on a regular time base).
OB1
OB10...17 OB20...23
OB30...38
OB40...47
OB80...87OB100,101
OB121,122
OB Start event Priority
1 Free cycle 1
10...17 Time-of-day interrupt 2
20...23 Time-delay interrupt 3...6
30...38 Cyclic interrupt 7...15
40...47 Process interrupt 16...23
55...57 DPV1 interrupts 2
60 Multi-computing 25
70...73 Red. error (H-CPU) 25
80...87 Async. error al. 26,28
100,101 Startup 27
121,122 Synchr. error al. like error-
generating
OB
(See system software for S7-300/400,
System and Standard Functions)
S7
OS
*
*
****
* User-/process-specific start event
** CFC-/block-specific start event
By assigning PCS 7 blocks to these Cyclic Interrupt OBs (settings for a Runtime group),
a designed time interval is achieved.
Startup behavior
In a warm restart, execution of the program restarts at the beginning of the program with
a "basic setting" of the system data and user address areas. Non-retentive timers,
counters, and memory bits are reset. All data blocks and their contents are retained.
 ATTENTION!
Warm restart = Default setting for PCS 7 and normal applications
In some situations, the block behavior at startup must differ from the normal behavior. It
may e.g. be required to suppress alarm for a number of cycles after startup.
In that case, a block must additionally be assigned to a startup OB (OB100). Due to
settings on the level of block attributes, this kind of blocks will be installed in OB100 at
creation.

PCS 7 System Course
When you restart (warm restart) an S7-400 (for example by changing the mode selector
from STOP to RUN or by turning the power ON) organization block OB100 is processed
before cyclic program execution begins (OB 32 - OB 38). As default, all the PCS 7
blocks that have a special startup behavior are installed in OB100.
Cyclic interrupt OBs
The properties of the Cyclic Interrupt OBs can be watched via CFC’s Options menu:

PCS 7 System Course
7.6 Run Sequence
7.6.1 How to Adapt the Run Sequence
Principle of the run sequence
When you insert blocks in the chart, they are automatically installed in the run
sequence. The installation position is decided by the "Predecessor for Installation".
Certain blocks are also installed more than once in tasks depending on the entry in the
task list assigned to the block type by the system attribute (S7_tasklist). Blocks with
startup characteristics are, for example, also installed in OB100.
Chart Installation Pointer
3
2
Task (OB)
Runtime
groups
1
4
1. For every chart a Runtime group (blue folder) is created in the Run Sequence,
containing the individual blocks per chart. It is assigned a cyclic OB. This is
important in PCS 7, because it ensures that the channel drivers and technological
blocks will be executed in the same cycle in a run sequence.
2. The green background color represents a pointer, controlling the position (after this
one) for the next new chart.
3. The pointer can be moved using the indicated menu option.
4. Runtime Groups can be moved by dragging, within an OB or to another OB.

PCS 7 System Course
Setting Installation Pointers
Installation pointers determine the installation position for the next unit of the run
sequence. These are the different pointers:
• Chart installation pointer
• Block installation pointer
Chart installation pointer Block installation pointer
Before defining as
predecessor
After defining as
predecessor
You can modify the installation pointers as follows:
• Chart installation pointer (default OB 35)
In the run sequence editor select the required OB or a block from the OB level (not
within a runtime group) or a runtime group within the OB.
Select the runtime editor menu command
Edit > Predecessor for Installation Position.
• Block installation pointer
You cannot set the block installation pointer in the runtime editor.
In the CFC editor select the block after which all other blocks are to be installed.
In the chart, select the menu command
Edit > Predecessor for Insertion Position.
If the block specified as the predecessor for installation is deleted, the block
installation pointer is set to the block installed before the deleted block. This also
applies if the block is moved to a different chart. The block installation pointer in the
destination chart is not changed. The moved block retains the installation position it
had in the previous chart.

PCS 7 System Course
7.6.2 Runtime properties
At inserting of a block into a chart, the block is assigned Runtime Properties. The block
will be installed in a Runtime group that is part of an OB sequence (Task).
Runtime groups are there to structure and split the tasks of an OB. They are
automatically created at the creation of a chart.
Every block header in CFC contains a green rectangle showing the runtime properties.
A double click in this rectangle shows the block position in the Run sequence (using the
Runtime editor).
7.6.3 Optimization of the Run sequence
Changes can be made to the order of program code execution of blocks:
Manual
Change the position of the block by dragging to the new position (installs behind the
block you are pointing to):

PCS 7 System Course
Automatic
This function is used to optimize the program run sequence according to the data flow in
order to reduce dead times to a minimum during program runtime in the CPU: so based
on connections between blocks. Tasks and runtime groups are optimized separately.
Uncheck the optimization
The option Optimize Run Sequence is valid for all blocks of all charts of the related
chart folder.
Single charts can be unchecked for this optimization process:
Optimize the full task,
including all enabled
runtime groups
Optimize only the
enabled runtime
groups of a task
Exclude the full task
- including its
runtime groups -
from optimization
Single charts can
be unchecked for
optimization

PCS 7 System Course
7.6.4 Runtime properties for experts: Activating/Deactivating runtime groups
Uncheck this box if
you don't want the
blocks installed within
this runtime group to
be executed
Result in the CFC
editor: indication that
the instances aren't
executed
Result in the run
sequence editor:
indication that the
instances aren't executed
You can select/deselect the check box in order to enable/disable the runtime group for
processing, if it is not interconnected. An interconnection always has priority.
In the detail window of the runtime editor in the column "Inactive", the mode of the
runtime group is displayed.
• The name corresponds with that of the runtime properties field of a block.
• The character "!" means that the relevant runtime group is inactive.
• The character "?" means that the "EN" of the runtime group is interconnected or
accessed by SFC. Therefore the runtime group is not in static process mode (may be
active or inactive).
You can select or deselect the option for the selected runtime group, without initiating
the object properties using the shortcut menu commands:
Switch on Runtime Group and Switch off Runtime Group
Process Object view
It is also possible, to activate/ deactivate runtime groups in the PO-View in the SIMATIC
Manager. You can do this in the Tab „General“

PCS 7 System Course
7.6.5 Runtime properties for experts: Switching runtime groups on and off
during operation
Indication in the run
sequence editor
Indications in
the CFC editor
Indications in the
CFC editor
 See [103] PCS 7 V8.0 Engineering System - 12_2011, 8.12.3.9 for more information
how to adapt the run sequence.

PCS 7 System Course
7.7 Different groups of blocks
The picture below shows the main groups of blocks that will appear in charts:
ProcessImageInputs
Output moduleInput module
PII
ProcessImageOutputs
PIQ
Plantbus
ES OS
Process
Input drivers Output drivers
Signal
processing
Monitoring and
Controlling
Automation system (CPU)
Actuator
Sensor
Input drivers Read values from the PII as process feedback, and offer them to outputs
to be read by other blocks inputs for processing.
Signal processing Processing values without users interference.
Monitoring and Controlling Monitoring and Controlling functions, including an interface to the
Operator Station. Block Icons and Faceplates in the OS offer information
about states and modes and allow process operations.
Output drivers Write values to the PIQ as the commands to the process.
Process Images
The Process Image Inputs (PII) and Process Image Outputs (PIQ) form the interface
between the signals from the I/O modules and the user program in the CPU of an AS.
Update
The transfer of values between the I/O modules and the Process Images is controlled
by properties (settings) on the CPU and the I/O modules.
The update of the information should be in the same rate as the signal processing.

PCS 7 System Course
7.8 Driver Blocks
7.8.1 General
Drivers form the interface between the process signals and the application.
They are a relevant part of the control loop:
PII PIQ
Plantbus
ES OS
Chart
Pcs7DiIn
PV_In PV_Out
MotL
FbkRun Start
Pcs7DiOu
PV_In PV_Out
M
1
654
3
8
7
2
1. The control signal from a channel of the output module is wired to the (control logic
of the) motor.
2. The feedback signal from the (control logic of the) motor is wired to a channel of the
input module.
3. The signals from the input module are transferred to the Process Image for Inputs
(PII), situated on the CPU.
4. The input driver reads the signal from the PII, and brings it into the chart to be
used by control blocks.
5. A control block reads the process value from the input drivers. Its logic will
generate one or more control signals.
6. The output driver reads the control signal from the control block.
7. The output driver writes the control signal to the Process Image for Outputs (PIQ),
situated on the CPU.
8. The control signals are transferred to the output module. The output module
converts them to proper electrical signals.

PCS 7 System Course
7.8.2 Digital Input and output
Signal from PII
(representing the input
from the process)
Input
driver
Process value
to be used by
control blocks
Control signal
from control block
Output
driver
Signal to PIQ
(representing the
output to the process)
7.8.3 Analog Input and Output
Signal from PII
(representing the input
from the process)
Input
driver
Process value
to be used by
control blocks
Control signal
from control block
Output
driver
Signal to PIQ
(representing the
output to the process)

PCS 7 System Course
7.8.4 Module drivers
Module drivers are blocks created by the driver generator. This generator is activated by
default at the compilation of charts:
The driver generator …
• Finds an I/O module that belongs to the I/O address connected to the channel drivers
• Creates charts “@(1) … @(7)” with blocks (module drivers) for diagnosing
information when errors appear in the I/O circuits
• Makes connections between module drivers and channel drivers to supply the
channel drivers with information about the I/O modules.
Indicated above is one of the connections to the channel drivers.
This “line” offers diagnostic information to the channel driver, to be used in the
application.

PCS 7 System Course
 ATTENTION!
No changes are allowed to the system charts since these involve system functions
(indicated by "@"). This also applies to changes to the installation in OBs or runtime
groups.
 The content of runtime groups, created by the driver generator ("Generate Module
Drivers" @......) are not optimized since the correct order is already set here.
If optimization is executed after creating the module drivers, there is no guarantee
that the runtime groups of the driver blocks are in the order specified by the driver
generator. Therefore the module driver is restarted during the next compilation (the
"Create module driver" check box is activated).
Channel driver and Signal Status
After the generation of the module drivers, every channel driver will have connections to
a module driver. Through the connections diagnostic information is offered to the
channel driver.
The main output of the input driver, PV_Out is set up as a so called “structure”. It is
bundling the actual Process Value and the related Signal Status.
The Signal Status may have different values, and may finally result in icons displayed
on the Operator Station:

PCS 7 System Course
7.8.5 Process Image Partitions
The picture below shows an example of settings concerning the Process Image
Partitions.
Pcs7DiIn VlvL Pcs7DiOu
Pcs7DiIn
Chart OB33 (0,5s)
T
I
PII PIQPcs7AnIn PIDConL Pcs7AnOu
Chart OB32 (1s)
CPU: OB32 > PIP2 OB33 > PIP3
AI8
DI16
DO16
AO4
PIP2
PIP2
PIP3
PIP3
1
2
3
4
4
5 5
1. Assuming the function in the chart for a temperature control is to be processed
every 1 second. The chart is installed in the run sequence of OB32.
2. Assuming the function in the chart for a open/close valve control loop is to be
processed every 0,5 seconds. The chart is installed in the run sequence of OB33.
3. Setting has been made to the CPU, activating the PIP2 by OB32 and PIP3 by
OB33.
4. PIP2 is set in the properties of the input and output modules, whose signals are to
be transferred to and from the process images, triggered by PIP2 (related to OB32).
5. PIP3 is set in the properties of the input and output modules, whose signals are to
be transferred to and from the process images, triggered by PIP3 (related to OB33).
OB33
500ms
OB1
OB32
1000ms
300ms 300ms
200ms 200ms 200ms 200ms
100 100
0ms 500ms 1000ms 1500ms 2000mtime
The time sequence diagram above indicates with the same colored arrows as the
picture before, on what moment the transfer is done of the signals from the I/O modules
to and from the Process Images.

PCS 7 System Course
Settings for CPU and I/O module
Below the settings concerning the Process Image Partitions, to be made on the CPU
and I/O module.
 ATTENTION!
Each change to the cyclic interrupt time of a CPU requires compilation of the program
and a download with STOP of the CPU.
 See [103] PCS 7 V8.0 Engineering System - 12_2011, 8.9.4.8 for more details

PCS 7 System Course
7.8.6 Symbolic Addresses
All I/O signals will be assigned absolute addresses at the moment the modules are
positioned in the station configuration of the AS (tool HW Config).
In general Symbolic addresses (short: Symbols) will be assigned to every I/O address. It
is stored per every AS in the so called Symbol table:
• Entering via HW Config:
1
5
4
3
2
1. Select the I/O rack containing the module whose
symbolic addresses you want enter. The editing
table will show the modules.
2. In the editing table, select the module and open the
context menu.
3. Select Edit Symbols …
4. Enter the Symbols and optionally the Comments.
When ready, click OK.
5. The symbolic names are added to the symbol table.
• Connection to the channel driver: It is strongly recommended to use symbolic names
for all I/O signal. This is the way how to connect to the channel drivers:
1
3
2
1. In this example a digital output channel driver is to be connected to an
address. Click right on the output PV_Out and select
Interconnection to Address …
2. A table shows the existing boolean
symbols. Select the required symbol.
3. The connection is displayed in CFC
as a line to the sheet bar, with all
information from the symbol table in
the table column.

PCS 7 System Course
7.8.7 Pcs7DiIn in brief
Obtaining the standard value
The digital value of the process image (partition) is sent to output parameter PV_Out
with the signal status 16#80.
Holding the last value if raw value is invalid
If the module is to hold the most recent valid value when the raw value is invalid, you
must activate this function on Feature bit 30 (Issuing last valid value if raw value is
invalid).
Output substitute value if raw value is invalid
If the module is to output a substitute value SubsPV_In when the raw value is invalid,
you must activate this function on Feature bit 29 (Issuing substitute value if raw value
is invalid).
Output of invalid value if raw value is invalid
If the module is to output an invalid value (PV_Out = PV_In), you must activate this
function on Feature bit 28 (Output invalid raw value).
This function is pre-selected.
Signal status for PCS7 channel blocks
The block provides the standard function "Forming and outputting signal status for
blocks".
Simulating signals
The block provides the standard function "Simulating signals".
 For more information on the signal status for PCS7 channel blocks, see
[113] PCS 7 V8.0 Advanced Process Library - 12_2011, 1.1.6.9
For more information on simulating signals, see

PCS 7 System Course
7.8.8 Pcs7AnIn in brief
Obtaining the standard value
The standard value (a physical quantity) is obtained from the raw value using
parameters Scale and Mode. Set two scale values on the structured parameter Scale.
• High scale value (Scale.High)
• Low scale value (Scale.Low)
The settings of the parameter Scale are copied to the output parameter ScaleOut.
The output parameter can be interconnected to a corresponding input parameter of a
technological block (e.g. PV_OpScale).
The standard value is obtained using a linear characteristic. Scale.Low is the lowest
physical value that the process variable can take and Scale.High is the highest.
If Scale.Low = 0 and Scale.High = 100 a percentage is obtained.
Holding the last value if raw value is invalid
If the module is to hold the most recent valid value when the raw value is invalid, you
must activate this function on Feature bit 30 (Issuing last valid value if raw value is
invalid).
You can also influence this function via the input parameter DeltaVal.
• DeltaVal ≤ 0: the last value is retained and is not influenced
• DeltaVal > 0: the last or the next to last value is output
If you set the parameter DeltaVal > 0, the last PV_Out(k-1) or next to last
PV_Out(k-2) valid output value is output (PV_Out(k) is the current value, k is the
current time).
At parameter DeltaVal you can preset a permitted process value change (PV_Out)
between two calls. You have the following options:
• For invalid raw values and DeltaVal > 0:
− If |PV_Out(k-1) - PV_Out(k-2)| > DeltaVal, then PV_Out =
PV_Out(k-2) (last but one valid output value is output)
− If |PV_Out(k) - PV_Out(k-1)| ≤ DeltaVal, then PV_Out = PV_Out(k-
1) (last valid output value is output)

PCS 7 System Course
• For valid raw values and DeltaVal > 0:
|PV_Out(k) - PV_Out(k-1)| > DeltaVal, so for one cycle PV_Out =
PV_Out(k-1) is output, i.e. DeltaVal is used to limit the change made to the valid
raw value. In addition, the signal status at the output parameter PV_Out is set to
16#60 and the output parameter is set to Bad = 0.
The value of DeltaVal should be selected with due care. If the value is too low, the
quality code may flutter between16#80 and 16#60, regardless whether or not the raw
value is OK.
Output substitute value if raw value is invalid
If the module is to output a substitute value SubsPV_In when the raw value is invalid,
you must activate this function on Feature bit 29 (Issuing substitute value if raw value
is invalid).
Output of invalid value if raw value is invalid
If the module is to output an invalid value (PV_Out = PV_In), you must activate this
function on Feature bit 28 (Output invalid raw value).
This function is pre-selected.
Value acceptance delay
After a restart, or if the output parameter Bad changes its value from 1 to 0, the signal
status and the value of output parameter PV_Out are not updated until the number of
cycles for delayed acceptance of the value (input parameter CountLim) have elapsed.
During the value acceptance delay the signal status at the output parameters is PV_Out
= 16#00 and Bad = 1. The last value is retained during the value acceptance delay. If
CountLim = 0, the function is deactivated.
Signal status for PCS7 channel blocks
The block provides the standard function "Forming and outputting signal status for
blocks".
Simulating signals
The block provides the standard function "Simulating signals".
 For more information on the signal status for PCS7 channel blocks, see
For more information on simulating signals, see

PCS 7 System Course
7.9 Trend Display
The CFC editor has a build in tool for trending. It is available for short term trending
during commissioning and trouble shooting.
A maximum of 12 values can be recorded at one time.
1
2
4
5
7
3
6
1. From CFC’s View menu, select Trend Display.
2. The Trend Display window will share the work area of CFC with the chart windows.
Add, delete and rename a Trend Display. Make a proper arrangement of the
windows.
3. Choose suitable recording parameters: number of values (10 …16000), acquisition
cycle (1 …9 s, 10 … 90 s) and Recording mode.
4. Use dragging to assign any input or output of a block to each of the up to 12
channels of a Trend Display. Values from several blocks and from several charts
can be assigned.
5. Set the High and Low limit values to fit the vertical axis (for each channel).
When Boolean values are used, a predefined range in the vertical axis is used per
channel to display the values false and true. Determine the number of values to be
displayed in the horizontal direction.
6. The "Start" button is active only in test mode. After starting, the start button changes
into a “Hold” button and is relabeled accordingly. You can then use it to stop
recording at any time.
7. Export the stored data to a file. You should check the settings for export using the
menu command
Options > Customize > Export Trend Data

PCS 7 System Course
7.10 Dynamic Display
Similar to the Trend Display, the Dynamic Display can be used in CFC test mode. It
offers a table that can have values of several blocks of several charts. All values can be
watched, and values of inputs without connection can be changed.
1
3
2
1. From CFC’s View menu, select Dynamic Display.
2. The Dynamic Display window will share the work area of CFC with the chart
windows. Make a proper arrangement of the windows and use dragging to assign
any input or output of a block to a line of a Trend Display.
3. Add, delete and rename Dynamic Displays.
Task: Drivers for the Signal Box
Goal
4 charts containing drivers for the I/O signals of the Signal Box.
Checkpoint
Let us summarize …
• Why have the @(..) charts
appeared in the Charts folder?
• What is the use of it?

PCS 7 System Course
7.12 Connection to the Process simulation in this training
7.12.1 Method in this training
There are several reasons that we do not offer you a real process for practicing.
A suitable process simulation will replace it, offering you I/O to represent a process in
work.
The picture below gives you an impression of the relationship between process I/O and
the application running in the automation system, and the simulation representing the
process.
Name
Process
images
Process value
Symbol table
Johnsson
Process
simulation
DI
DO
AI
AO
Process
Pcs7DiIn
Pcs7DiOu
Pcs7AnIn
Pcs7AnOu
Control block
Motor block
Hardware Software
I/O Modules Driver blocks
The process simulation (running in the CPU as a Function Block) is using the original
Process Image as an interface to the application software in the automation system.
This makes it possible for you to configure functions with channel drivers, similar to real
applications.
The symbol table contains the corresponding signal names for the process values in the
Process Image and their addresses. These addresses should not overlap the addresses
of the real hardware.

PCS 7 System Course
Example for V311
Here you see the simulated valve V211 (D210 Dose tank inlet valve 1) as an example
and a part of the process simulation:
Pcs7DiIn
Pcs7DiIn
Pcs7DiOuVlvL blockV311_O
Process
images
V311_C
V311
Johnsson
V311
1
2
3
4
1. Simulation of V311, as a part of the Johnsson plant simulation. It is running in a
single function block on a chart called “@Johnsson”. This chart should only be
present in the Charts folder of your AS.
2. Control signal to the valve, using the valve tag name as the symbolic name
3. Feedback signals formed by limit switches:
− “V311_O” = opened
− “V311_C” = closed
4. A chart with a minimum of blocks to control and monitor the block. This chart is to
appear in the plant hierarchy.
7.12.2 Overview
The number of I/O is based on the devices in the plant.
The following table gives an overview of the number of devices and the related I/O:
number DI DO AI AO
open-close valves 25 50 25
status valves 5 5
motors 11 11 11
level measurement 13 13
temperature measurement 4 4
control valve 4 4 4
total 62 66 36 21 4
number of channels per module 16 16 4 4
number of modules 4,125 2,25 5,25 1
lowest address I 100.0 Q 100.0 IW 208 QW 208
highest address I 110.5 Q 105.1 IW 258 QW 214

PCS 7 System Course
7.12.3 Digital Inputs
signal
name
address data type description
V111_O I100.0 BOOL M110 Material tank Inlet valve Feedback Opened
P113_O I100.1 BOOL M110 Material tank Outlet pump Feedback On
V112_C I100.2 BOOL M110 Material tank Outlet valve Feedback Closed
V112_O I100.3 BOOL M110 Material tank Outlet valve Feedback Opened
V211_C I102.0 BOOL D210 Dose tank Inlet valve 1 Feedback Closed
V211_O I102.1 BOOL D210 Dose tank Inlet valve 1 Feedback Opened
V311_C I106.0 BOOL R310 Reactor Inlet valve Feedback Closed
V311_O I106.1 BOOL R310 Reactor Inlet valve Feedback Opened
P313_O I106.2 BOOL R310 Reactor Outlet pump Feedback On
V312_C I106.3 BOOL R310 Reactor Outlet valve Feedback Closed
V312_O I106.4 BOOL R310 Reactor Outlet valve Feedback Opened
M316_O I106.5 BOOL R310 Reactor Stirring motor Feedback On

PCS 7 System Course
signal
name
address data type description
V411_C I110.0 BOOL B410 Buffer tank Inlet valve Feedback Closed
V411_O I110.1 BOOL B410 Buffer tank Inlet valve Feedback Opened
V412_O I110.2 BOOL B410 Buffer tank Outlet valve Feedback Opened
V421_C I110.3 BOOL B420 Buffer tank Inlet valve Feedback Closed
V421_O I110.4 BOOL B420 Buffer tank Inlet valve Feedback Opened
V422_O I110.5 BOOL B420 Buffer tank Outlet valve Feedback Opened
7.12.4 Digital Outputs
signal name address data type description
P113 Q100.0 BOOL M110 Material tank Outlet pump
V112 Q100.1 BOOL M110 Material tank Outlet valve
V211 Q101.0 BOOL D210 Dose tank Inlet valve 1
V311 Q103.0 BOOL R310 Reactor Inlet valve
P313 Q103.1 BOOL R310 Reactor Outlet pump
V312 Q103.2 BOOL R310 Reactor Outlet valve
M316 Q103.3 BOOL R310 Reactor Stirring motor
V411 Q105.0 BOOL B410 Buffer tank Inlet valve
V421 Q105.1 BOOL B420 Buffer tank Inlet valve

PCS 7 System Course
7.12.5 Analog Inputs
signal name address data type description low range high range unit
LT114 IW208 WORD M110 Material tank Level 0 6000 kg
LT214 IW216 WORD D210 Dose tank Level 0 400 kg
LT314 IW224 WORD R310 Reactor Level 0 700 kg
TT315 IW226 WORD R310 Reactor Temperature 0 200 degr C
CV315_X IW228 WORD R310 Reactor Temperature control valve feedback
position
0 100 %
position
0 100 %
position
0 100 %
position
0 100 %
LT414 IW256 WORD B410 Buffer tank Level 0 12000 kg
LT424 IW258 WORD B420 Buffer tank Level 0 18000 kg
7.12.6 Analog Outputs
signal name address data type description low range high range unit
CV315 QW208 WORD R310 Reactor temperature control valve 0 100 %

PCS 7 System Course
Task: Installing the process simulation
Goal
A running process simulation of the Johnsson plant.
After this task the functions for the plant can be configured.
Checkpoint
Consider …
• What is the use of channel driver
blocks, why not just connecting to
the I/O addresses?

07 connection to the process v1.00_en

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Similar to 07 connection to the process v1.00_en

Similar to 07 connection to the process v1.00_en (20)

More from confidencial

More from confidencial (13)

Recently uploaded

Recently uploaded (20)

07 connection to the process v1.00_en