This document provides an overview of PROFIBUS basics, including: - PROFIBUS allows for high-speed data exchange between active stations like PLCs and passive stations like field devices using the same cable and components. - It supports functions like parameterization, I/O configuration, data exchange, and diagnostics between a master and slave devices in a cyclic manner. - The configuration tool allows users to select parameters and I/O for devices with electronic data sheets to enable plug-and-play functionality.

1. PROFIBUS Basics
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PROFIBUS Basics
s
Active Stations
Passive Stations (Field Devices)
PLC
PC
PROFIBUS

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All PROFIBUS services
High Speed Data Exchange
Peer to Peer
Hazardous Area
can be used together in one network
Therefore Communication is Transparent for
the User
Same Cable and Components for High Speed
Data Exchange and Peer to Peer

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High-Speed Data Exchange Features
Same priority for all field devices
Communication is permanent & cyclic
Amount of data specified during configuration
Only one master can write to outputs (safety
aspect)
Acyclic communication to field devices possible by
using extended functions (DP Extended/DPV1)
Alarm acknowledgment
Up to 244 bytes input AND 244 bytes output data
per field device
Fastest fieldbus system (up to 12Mbaud)

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System Configuration
PLC
PROFIBUS
GSD GSD GSD GSD GSD GSD
Plug & Play With Electronic Device Data Sheets
PROFIBUS
Configuration Tool
Electronic Device Data Sheets (GSD, GSE, GSF, GSG, GSI, GSP, GSS Files)

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High-Speed Data Exchange - Startup Sequence
Power ON/
Reset
Power ON/Reset of Master or Slave
Parameterization
Download of Parameters into the Field
Device (selected during Configuration
by the User)
I/O Configuration
Download of I/O Configuration into the
Field Device (selected during
Configuration by the User)
Data Exchange
Cyclic Data Exchange (I/O Data)
and Field Device reports Diagnostics

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High-Speed Data Exchange - Parameterization
Master Slave
Features Implemented in Device
Described in GSD File
Processed by Configuration Tool
Selected at Configuration
Examples:
Enable Channel Diagnostic
Operation Range for Analog Channels
(e.g. ±10V or 0..10V)
Fail Safe Behavior (e.g. Hold Last
Value)
Parameter Download (up to 244 bytes)
= Parameterization Data = Confirmation (Data Received)

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Parameterization (continued)
Parameter selection with Configuration Tool
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Fewer DIP Switches - NO Handheld - NO Extensive Additional Documentation
User defines every Function in ONE Tool.

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High-Speed Data Exchange - Configuration
Master
Configuration Download (up to 244 bytes)
= Configuration Data = Confirmation (Data Received)
Possible I/O Selections described in GSD File
Processed by Configuration Tool
Selected at Configuration
Examples
8DI (1 Byte), 8DO (1 Byte)
2AI (2 Words), 2AO (2 Words)
RS232 Interface, Counter Module
Slave

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Configuration Tool (continued)
I/O selection with Configuration Tool

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PROFIBUS Demo
Parameter &
I/O
Selection
Parameter &
I/O
Selection

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High-Speed I/O - Data Exchange & Diagnostics
Master Slave
= Output Data = Input Data
Master Slave
Slave indicates diagnostics to report
Data Exchange (up to 244 bytes)
= Diagnostic Indicator

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Data Exchange & Diagnostics (continued)
Master Slave
= Diagnostic Request = Diagnostic Response
Master Slave
Data Exchange (up to 244 bytes)
Diagnostic Request and Response (up to 244 bytes)

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Diagnostic Response (continued)
6 Bytes
Mandatory
Header Header Header
Device
Related
(Optional)
Identifier
Related
(Optional)
Channel
Related
(Optional)
Up to 244 Bytes
e.g. wrong
configuration
e.g. no load
power
e.g. module #4
has diagnostic
e.g. wire break or
short circuit

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High-Speed Data Exchange - Fail Safe
What happens if my bus fails:
valve open, valve closed,
valve 1/2 open…???
Optional feature Fail Safe specifies behavior of
Outputs in case of Communication Loss
Optional feature Fail Safe specifies behavior of
Outputs in case of Communication Loss

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Fail Safe (continued)
Optional Feature for Field Devices
Defined in Electronic Device Data Sheet
Manufacturer has the capability to allow the End
User to specify the action on loss of communication
Hold outputs at the last value received (e.g. valve 1/2 open)
Set outputs to a specified value (e.g. open or close valve
completely)
User defines action during Parameterization

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Fail Safe (continued)

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PROFIBUS Demo
Diagnostics &
Fail Safe
Diagnostics &
Fail Safe

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High-Speed Data Exchange Timing
10 Stations With 2 Byte I/O (160 In/Output Signals)
Bus Cycle Time 0.8ms

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High-Speed Data Exchange Timing
10 Stations With 128 byte I/O (10,240 In/ Output Signals)
Bus Cycle Time 2.0ms

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High-Speed Data Exchange Timing
Typical Cycle Time - Each Station With 2 Byte I/O
0.3 0.5
2.1
8.8
2.0
20.5
1.5
0.8
3.3
2.00.9
6.1
4.6
7.7
14.1
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
18.0
20.0
1 5 10 20 30 [Number of
Slaves]
[ms]
12MBaud
1.5MBaud
500kBaud

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PROFIBUS Summary
Extensive Parameterization Features
Extensive Diagnostic Features
Fail-Safe Behavior
Deterministic
Fast (Up to 12 MBaud)
Safe and Reliable
Easy Configuration
Capabilities for Complete Plant Solution from
Cell to Bit Level