Siemens S7-1200 System Manual page 436

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Technology instructions

9.2 PID control

ErrorBit (DW#16#...)

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

The actuator cannot be moved to the manual value and remains in its

current position.

Assign a valid value in ManualValue or move the actuator in manual mode

with Manual_UP and Manual_DN.

Invalid value at the SavePosition tag: Value has an invalid number format.

The actuator cannot be moved to the substitute output value and remains in

its current position.

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_3Step remains in

automatic mode.

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

= TRUE before the error occurred, PID_3Step 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.

The error has no effect during transition time measurement.

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

PID_3Step remains in automatic mode.

Note: If pre-tuning, fine tuning, or transition time measurement mode were active and

ActivateRecoverMode = TRUE before the error occurred, PID_3Step 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_3Step switches to "Approach substitute output value with error monitoring" or "Error

monitoring" mode. As soon as the error is no longer pending, PID_3Step switches back to

automatic mode.

Note: If ActivateRecoverMode = TRUE before the error occurred, PID_3Step cancels the tuning

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

The actuator cannot be moved to the substitute output value and remains in its current position. In

manual mode, you can change the position of the actuator only with Manual_UP and Manual_DN,

and not with ManualValue.

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG