Siemens SIMATIC S7-1200 Function Manual page 82

Using PID_Compact
4.2 PID_Compact V2
If one or more of the following errors occur in automatic mode, PID_Compact switches to
"Substitute output value with error monitoring" mode and outputs the last valid output
value:
– 0002h: Invalid value at Input_PER parameter.
– 0200h: Invalid value at Input parameter.
– 0400h: Calculation of output value failed.
– 1000h: Invalid value at Setpoint parameter.
If an error occurs in manual mode, PID_Compact continues using the manual value as
the output value. If the manual value is invalid, the substitute output value is used. If the
manual value and substitute output value are invalid, the output value low limit is used.
If the following error occurs during a pretuning or fine tuning, PID_Compact remains in
active mode:
– 0020h: Pretuning is not permitted during fine tuning.
When any other error occurs, PID_Compact cancels the tuning and switches to the mode
from which tuning was started.
As soon as no errors are pending, PID_Compact returns to automatic mode.
● Substitute output value while error is pending
PID_Compact outputs the substitute output value.
If the following error occurs, PID_Compact stays in "Substitute output value with error
monitoring" mode and outputs the output value low limit:
– 20000h: Invalid value at SubstituteOutput tag.
For all other errors, PID_Compact reacts as described for "Current value while error is
pending".
See also
Parameters State and Mode V2 (Page 265)
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Function Manual, 03/2017, A5E35300227-AC
PID control