Fold temporary variable using function block instance output variable

Optimize output variables by using expression folding

Since R2022b

Model Configuration Pane: PLC Code Generation / Optimization

Description

The Fold temporary variable using Function Block instance output variable parameter optimizes the code for the output variables of function blocks generated from reusable Simulink^® subsystems, Stateflow^® charts, or MATLAB^® Function blocks by removing temporary variable assignments that are not required.

Settings

off (default) | on

Default: off

On

Generates optimized code for output variables of function blocks by folding temporary variables into a single expression.

Off

The generated code for function block instance output variables uses temporary variable assignments.

Recommended Settings

Application	Setting
Debugging	No impact
Traceability	No impact
Efficiency	On
Safety precaution	No impact

Programmatic Use

Parameter:PLC_FoldFBCallOutputVar

Type: string

Value: 'on' | 'off'

Default: 'off'

Limitations

This option is not supported for the Rockwell Automation^® Studio 5000 and OMRON Sysmac^® Studio target IDEs.

Do not use this option when you have enabled the PLC_UseCallOutputArgSyntax parameter. If you enable PLC_UseCallOutputArgSyntax, Simulink PLC Coder™ throws a warning during code generation and sets PLC_UseCallOutputArgSyntax to 'off'.

You cannot select this parameter when the Target IDE parameter is set to Schneider Electric - EcoStruxure Control Expert. When you set the Target IDE parameter to Schneider Electric - EcoStruxure Control Expert, Simulink PLC Coder sets this parameter to "off".

Version History

Introduced in R2022b