Instructions
9.2 PID_3Step
PID control
338 Function Manual, 03/2017, A5E35300227-AC
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.
Your system may be damaged.
If ActivateRecoverMode = TRUE, PID_3Step remains in automatic mode even if 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.
FALSE In the event of an error, PID_3Step switches to "Inactive" or "Approach substitute output value" mode.
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_3Step 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_3Step stays in automatic mode:
• 0001h: The "Input" parameter is outside the process value limits.
• 0800h: Sampling time error
• 40000h: Invalid value at Disturbance parameter.
If one or more of the following errors occur, PID_3Step switches to "Approach substitute output value
with error monitoring" or "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 one or more of the following errors occur, PID_3Step can no longer move the actuator:
• 2000h: Invalid value at Feedback_PER parameter.
• 4000h: Invalid value at Feedback parameter.
• 8000h: Error during digital position feedback.
• 20000h: Invalid value at SavePosition tag. Value has an invalid number format.
The characteristics are independent of ErrorBehaviour.
As soon as the errors are no longer pending, PID_3Step switches back to automatic mode.
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