Siemens S7-1200 System Manual page 427

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ErrorBit (DW#16#...)

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG

Invalid value at the SubstituteValue tag: Value has an invalid number

PID_Compact uses the output value low limit as the output value.

Note: If automatic mode was active before the error occurred,

ActivateRecoverMode = TRUE, and the error is no longer pending,

PID_Compact switches back to automatic mode.

Invalid value at the Disturbance parameter: Value has an invalid number

Note: If automatic mode was active and ActivateRecoverMode = FALSE

before the error occurred, Disturbance is set to zero. PID_Compact remains

in automatic mode.

Note: If pre-tuning or fine tuning mode was active and ActivateRecoverMode

= TRUE before the error occurred, PID_Compact switches to the operating

mode that is saved in the Mode parameter. If Disturbance in the current

phase has no effect on the output value, tuning is not canceled.

Note: If automatic mode was active before the error occurred and ActivateRecoverMode = TRUE,

PID_Compact remains in automatic mode.

Note: If pre-tuning or fine tuning mode was active before the error occurred and

ActivateRecoverMode = TRUE, PID_Compact switches to the operating mode that is saved in the

Mode parameter.

Note: If automatic mode was active before the error occurred and ActivateRecoverMode = TRUE,

PID_Compact outputs the configured substitute output value. As soon as the error is no longer

pending, PID_Compact switches back to automatic mode.

Note: If ActivateRecoverMode = TRUE before the error occurred, PID_Compact cancels the tuning

and switches to the operating mode that is saved in the Mode parameter.

Technology instructions

9.2 PID control