How to check if the control parameters in STEP 7 have changed?

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Top answer

To check the parameters, follow these steps:

After changing the effective parameter of the controller, this module changes the parameter "PAR_ACT" from 0 to 1.
Function block "FMT_PID" reads a controller parameter with system function SFC59 "RD_REC" from the module.
Function block "FMT_PID" writes a controller parameter with system function SFC58 "WR_REC" to the module, to check it.
The module compares the sent and received parameters of the controller, and if everything is OK changes the parameter "PAR_ACT" from 1 to 0.

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