Siemens SIMATIC S7-1200 Function Manual page 365

State / Re- Description
tain.Mode
7 Error monitoring
The control algorithm is switched off and no longer changes the valve position.
This operating mode is activated instead of "Inactive" mode in the event of an error.
All the following conditions must be met:
Mode = 3 (automatic mode)
•
Errorbehaviour = 0
•
ActivateRecoverMode = TRUE
•
One or more errors have occurred in which ActivateRecoverMode (Page 372) is effective.
•
As soon as the errors are no longer pending, PID_3Step switches back to automatic mode.
8 Approach substitute output value with error monitoring
This operating mode is activated instead of "Approach substitute output value" mode in the event of an
error. PID_3Step moves the actuator to the substitute output value and then switches to "Error monitoring"
mode.
All the following conditions must be met:
Mode = 3 (automatic mode)
•
Errorbehaviour = 1
•
ActivateRecoverMode = TRUE
•
One or more errors have occurred in which ActivateRecoverMode (Page 372) is effective.
•
As soon as the errors are no longer pending, PID_3Step switches back to automatic mode.
PID control
Function Manual, 03/2017, A5E35300227-AC
Instructions
9.2 PID_3Step
365