FB_BA_ProjectEx

This template is derived from the basic function block FB_BA_Project.

It provides the project version number for information purposes and ensures that persistent data is saved.

The writing of persistent data has 2 modes:

• Normal state of the system:

Commissioning is complete and the system is running.

The persistent data is written at a fixed interval tPrsData_DefaultPeriod, pre-set to 30 minutes. This protects the memory card. Parameterizing tPrsData_DefaultPeriod below 10 minutes resets this value to 30 minutes as a precaution.

• Commissioning mode:

By automatically detecting an online change, the system switches to commissioning mode and the persistent data is now saved at shorter intervals. The interval tPrsData_ComissioningPeriod, which is pre-set to 10 minutes, applies here. Parameterizing tPrsData_ComissioningPeriod below 30 seconds resets this value to 5 minutes as a precaution.

If no online change is detected after a fixed DETECT_COMISSIONING_DURATION time of 60 minutes, the routine returns to normal operation.

Syntax

FUNCTION_BLOCK FB_BA_ProjectEx EXTENDS FB_BA_Project
VAR_INPUT CONSTANT PERSISTENT
  tPrsData_DefaultPeriod         : TIME := T#30M;
  tPrsData_ComissioningPeriod    : TIME := T#10M;
END_VAR
VAR_INPUT CONSTANT
  bPrsData_ManualWriteData       : BOOL;
END_VAR
VAR_INPUT
  bWrtPrsOnPowerFail             : BOOL;
END_VAR
VAR_OUTPUT
  nPrsDataWritten                : UINT;
END_VAR