Siemens SIMATIC S7-1200 Function Manual page 370

Instructions
9.2 PID_3Step
ErrorBits Description
( DW#16#...)
2000 Invalid value at Feedback_PER parameter.
Check whether an error is pending at the analog input.
The actuator cannot be moved to the substitute output value and remains in its current position. Manual
mode is not possible in this state. You must deactivate position feedback (Config. FeedbackOn =
FALSE) to move the actuator from this state.
If automatic mode was active before the error occurred, ActivateRecoverMode = TRUE, and the error is
no longer pending, PID_3Step switches back to automatic mode.
4000 Invalid value at Feedback parameter. Value has an invalid number format.
The actuator cannot be moved to the substitute output value and remains in its current position. Manual
mode is not possible in this state. You must deactivate position feedback (Config. FeedbackOn =
FALSE) to move the actuator from this state.
If automatic mode was active before the error occurred, ActivateRecoverMode = TRUE, and the error is
no longer pending, PID_3Step switches back to automatic mode.
8000 Error during digital position feedback. Actuator_H = TRUE and Actuator_L = TRUE.
The actuator cannot be moved to the substitute output value and remains in its current position. Manual
mode is not possible in this state.
In order to move the actuator from this state, you must deactivate the "Actuator endstop" (Con-
fig.ActuatorEndStopOn = FALSE).
If automatic mode was active before the error occurred, ActivateRecoverMode = TRUE, and the error is
no longer pending, PID_3Step switches back to automatic mode.
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Function Manual, 03/2017, A5E35300227-AC
PID control