Customization in ROMeo (CU,EDI,MAcro).pptx

Refresher for Variable Types
• Free-Dependent: Must equal the number of equations in f(x). Adjusted to satisfy f(x).
»25,000 for crude unit
• Fixed: Do not change.
• Free-Independent: “Optimization” variables. Manipulated to max / min objective.
Usually < 300 for Data Rec, < 50 for $ optimization (crude unit)

Model Specification
• All unit operations are created square
• Number of free vars = number eqns
• Fixed/free depend on unit’s specifications
• You can change var’s fixed/free status
• *It is possible to fix variables in ways that the model can’t be solved
• ROMeo lets you add equations and variables to the flowsheet.
• ROMeo forces you to maintain a square flowsheet:
• E.g., if you free up a variable, you must fix another or add an equation
• Prevents trouble

Overview of Customization Unit
• Change the Fix/Free status of variables
• Add equations and variables
• Must be square to avoid a degree-of-freedom mismatch.
© 2019 AVEVA Group plc and its subsidiaries. All rights reserved.
• Unit Customizations
• Can only access variables in that unit
• Visual indicator on the PFD drawing
• Flowsheet Customizations
• Can access any variable in flowsheet
• Can override unit customizations
The Customization feature lets you create custom specifications in place of the standard unit specifications
that are available in the AVEVA Process Optimization library model windows.

Assumptions and Restrictions
• You may fix only those variables that are currently free. Conversely, you may free only those variables
that are currently fixed.
• Although it is possible to have multiple Flowsheet Customization “units” on a flowsheet, a given variable
(including any unit or stream variable) can be freed only once at the flowsheet level.
• The data entry window of Flowsheet Customisation is similar in appearance to that of Unit
Customization. However, in Flowsheet Customization, the unit and stream variables for the entire
flowsheet are displayed in the left pane, while only the variables for the individual unit are available in
Unit Customization.
• The customization will report an error if you have customized the model in a non-square way
the number of valid independent variables + the number of new equations = the number of valid dependent variables + the number of new variables

Customization
Independent ⇔ Dependent
• Changing the status of a free/dependent
variable to fixed/ independent (thus, a
solution variable becomes a fixed
specification variable).
• Changing the status of a fixed/independent
variable to free/ dependent (thus, a variable
that was previously a fixed specification
variable becomes a solution variable).
• The validity of the variable is indicated by its
colour.
• Grey — Variable status is passive and invalid.
• Brown — Variable status is bad and invalid.
• Black — Variable status is active and valid.
• Only those stream properties that have been
selected for inclusion in the Calculated
Properties list are available to be fixed or be
used in equations (eg LHV).

Dimensional Consistency
• When creating user added variables and equations, pay very close attention to the
dimensions.
• If your equations are dimensionally inconsistent your results will be wrong.
• The software will check your equations for dimensional consistency, but will only issue
warnings—not errors.
• The key fact to understand is that the software does all calculations in internal Units of
Measure, which are SI.
Internal UOM

ROMeo internal
Units.
SI Units

Other Capabilities
• Conditional Equations.
• Mathematical Functions.

Exercise: Practice for Customization Unit

Exercise
• Create Customization to represent an inferential Calculation in four different ways.
1. Create same as inferential equation.
2. Create inferential using dimensional consistency – Convert to internal UOM.
3. Create inferential using dimensional consistency – Make equation dimensionless.
4. Create using dimensional consistency – specify UOM within equation structure.
• Compare the data
Create a Customization unit in ROMeo

Inferential Data.
• INF (C) = 0.7 * T101 (C) - 2.1 * P101 (kg/cm2g) - 0.1 * F101 (m3/h)
• INF - 0.7 * T101 (C) - 2.1 * P101 (kg/cm2g) - 0.1 * F101 (m3/h) ==0
Tag No. Ope. Data (1) UOM Coefficient (2) Internal UOM (1) * (2)
T101 100 C 0.7 K 70
P101 1.1 kg/cm2g -2.1 kPa -2.31
F101 70 m3/hr -0.1 m3/sec -7
Expected Value 60.69

INF1 - Same as inferential equation.

INF2 - Compensate to internal UOM.

INF3 - Make equation dimensionless

INF4 - Specify UOM within equation structure.

EDI Refresher
• Interface between ROMeo variables and external data bases
• Data transfer in both directions
• OPC
• OLEDB
• ODBC (Microsoft Open Data Base Connectivity)
• @aGlance - commercial client/server communication software for Historians
• PI (OSI)
• PHD (Honeywell)
• AIM* (Invensys)
• Not just measurements: Almost anything in Model window
• Upper and lower bounds
• Assay data
• Feed, Product, Utility prices
• Equipment On/Off status
• Key Performance Indicators (e.g. HX U and DP)
Most models have multiple data sources

EDI Components
• EDI consists of four components:
• Digital Types
• Digital Converters
• Data Sources
• IO Blocks

I/O Blocks
• Data to be transferred are organized as
• I/O Blocks, Port Groups, Ports
• Ports represents a connection between a database point and a ROMeo variable
• Perform actions on any of these for data transfer options.

Ports
• To connect an EDI port to a variable
• Drag and drop from the EDI window to a model window
• Or… automate the procedure using macros
• Design your EDI configuration based on purpose
T
T
T
T
T
Download same price to all sources
Download price to source
Dilution
Steam
T
T
T
T
T
…Or…
Simple and 1 place to enter prices
More flexible for lineup
changes
Sync. prices by
downloading the same
value to each source

Steps to create EDI port from GUI.
• Depending on desired design, Create a new EDI Port block
and group for OPC connection. Enable export if it an output
block.
• Right-click on the port group you want to add new tags to
and select New Port. Add port name from the table
• Enable export if it an output tag and accept the remaining
defaults. Click OK.
• Open Model window of the variable to which EDI port is to
be connected and then open EDI. You can then drag and
drop newly created EDI ports to model variable of their
respective user variables (Point to remember: To which
attribute will you connect ?)
• You can use this model-window approach to connect any EDI
port to any variable or parameter attribute. For example, you
can connect an EDI port to the Lower bound on a variable.

Overview of Macro
• A “program” you write to automate a task.
• Can perform some tasks that are not built in to
ROMeo.
• Uses the TCL scripting language.
• Can modify data and make function calls on
models (e.g. GenerateEstimates).
• Can be called by Real Time System.
• Coding can be done via Macro Editor connected
to Notepad++.
• Can be accessed from Macro Manager

Typical Uses for Macro
• Change the value of a variable
• Change the fix/free status of a variable
• Custom measurement screening
• Troubleshooting
• Set Lower bound on all molar flows to
0.001 lb-mole/hr
• Find all flowrates that have changed by
more than 10%
• Load assay from EDI to Mod Thermo
• Automatically reconfigure flowsheet
like furnace selection, HX bypass etc.

Sample Macro Code
• Set Lower bound on all molar flows to 0.001 lb-mole/hr
set flows [FindVariable * MolarFlow]
foreach i $flows {
SetValue $i LO [ConvertUOMValue Rate lb-mole/hr Internal 0.001]
}

Exercise: Practice for Macros
• If measurement < 0.01, send all flow to rundown and turn off storage

• In an online environment, the software
runs unattended, so macros must be
automatically executed.
• Configure “Macro” Task in RTS.
• Launch macro from Real time system.
• Allows model to automatically update to
plant lineup changes, switch from Datatec
specification to optimization, etc.
Executing Macros in the Online Environment

How to Create and Run Macros from ROMeo Model
• To create a macro, do the following:
• From the Input menu, choose Macro Manager.
• Right-click on Macros and create a
newsubcollection. Right-click on the new
subcollection and create a new macro
• Type the name you want to assign to the macro.
On the definition window, enter the macro code.
• Use “macro Editor for ease of writing large codes.
• Pressing “Execute” will run the macro.
• Pressing OK will save macro. If you cancel macro
will not be saved and executed action will be
reversed.

Customization in ROMeo (CU,EDI,MAcro).pptx

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