Siemens S7-1200 System Manual page 430

Technology instructions
9.2 PID control
Parameter and type
ManualUP IN
ManualDN IN
ErrorAck IN
Reset IN
ModeActivate IN
Mode IN
ScaledInput OUT
ScaledFeedback OUT
Output_UP OUT
430
Data type Description
Bool
Manual_UP = TRUE:
•
– The valve is opened even if you use Output_PER or a position
feedback. The valve is no longer moved if the high end stop has
been reached.
– See also Config.VirtualActuatorLimit
Manual_UP = FALSE:
•
– If you use Output_PER or a position feedback, the valve is
moved to ManualValue. Otherwise, the valve is no longer
moved.
Note: If Manual_UP and Manual_DN are set to TRUE simultaneously,
the valve is not moved.
Bool
Manual_DN = TRUE:
•
– The valve is opened even if you use Output_PER or a position
feedback. The valve is no longer moved if the high end stop has
been reached.
– See also Config.VirtualActuatorLimit
Manual_DN = FALSE:
•
– If you use Output_PER or a position feedback, the valve is
moved to ManualValue. Otherwise, the valve is no longer
moved.
Bool Resets the ErrorBits and warning outputs. FALSE to TRUE edge
Bool Restarts the controller. (Default value: FALSE):
FALSE to TRUE edge:
•
– Switches to "inactive" mode
– Resets the ErrorBits and warning outputs
– Clears Integral action
– Maintains PID parameters
As long as Reset = TRUE, PID_3Step remains in "Inactive" mode
•
(State = 0).
TRUE to FALSE edge:
•
– PID_3Step switches to the operating mode that is saved in the
Mode parameter.
Bool The PID_3Step switches to the mode that is saved in the Mode
parameter. FALSE to TRUE edge:
Int The desired PID mode; Activated on the leading edge of the Mode
Activate input.
Real Scaled process value
Real Scaled valve position feedback
Note: For an actuator without position feedback, the position of the
actuator indicated by ScaledFeedback is very imprecise.
ScaledFeedback can only be used for rough estimation of the current
position in this case.
Bool Digital output value for opening the valve. (Default value: FALSE)
If Config.OutputPerOn = FALSE, the parameter Output_UP is used.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG