Tag Activaterecovermode V2 - Siemens SIMATIC S7-1200 Function Manual

9.1.4.10

Tag ActivateRecoverMode V2

The ActivateRecoverMode tag determines the reaction to error. The Error parameter
indicates if an error is pending. When the error is no longer pending, Error = FALSE. The
ErrorBits parameter shows which errors have occurred.
Automatic mode
NOTICE
Your system may be damaged.
If ActivateRecoverMode = TRUE, PID_Compact remains in automatic mode even if there is
an error and the process limit values are exceeded. This may damage your system.
It is essential to configure how your controlled system reacts in the event of an error to
protect your system from damage.
ActivateRecov- Description
erMode
FALSE PID_Compact automatically switches to "Inactive" mode in the event of an error. The controller is only
activated by a falling edge at Reset or a rising edge at ModeActivate.
TRUE If errors occur frequently in automatic mode, this setting has a negative effect on the control response,
because PID_Compact switches between the calculated output value and the substitute output value at
each error. In this case, check the ErrorBits parameter and eliminate the cause of the error.
If one or more of the following errors occur, PID_Compact stays in automatic mode:
0001h: The "Input" parameter is outside the process value limits.
•
0800h: Sampling time error
•
40000h: Invalid value at parameter Disturbance.
•
If one or more of the following errors occur, PID_Compact switches to "Substitute output value with error
monitoring" mode:
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 the following error occurs, PID_Compact switches to "Substitute output value with error monitoring"
mode and moves the actuator to Config.OutputLowerLimit:
20000h: Invalid value at SubstituteOutput tag. Value has an invalid number format.
•
This characteristics are independent of SetSubstituteOutput.
As soon as the errors are no longer pending, PID_Compact switches back to automatic mode.
PID control
Function Manual, 03/2017, A5E35300227-AC
Instructions
9.1 PID_Compact
271