Input Parameters Of Pid_3Step V2 - Siemens SIMATIC S7-1200 Function Manual

Instructions
9.2 PID_3Step
9.2.4.4

Input parameters of PID_3Step V2

Table 9- 7 Input parameters of PID_3Step V2
Parameter
Setpoint
Input
Input_PER
Actuator_H
Actuator_L
Feedback
Feedback_PER
Disturbance
ManualEnable
ManualValue
316
Data type Default
REAL 0.0
REAL 0.0
INT 0
BOOL FALSE
BOOL FALSE
REAL 0.0
INT 0
REAL 0.0
BOOL FALSE
REAL 0.0
Description
Setpoint of the PID controller in automatic mode
A tag of the user program is used as source for the process
value.
If you are using parameter Input, then Con-
fig.InputPerOn = FALSE must be set.
An analog input is used as the source of the process value.
If you are using parameter Input_PER, then Con-
fig.InputPerOn = TRUE must be set.
Digital position feedback of the valve for the high endstop
If Actuator_H = TRUE, the valve is at the high endstop and is
no longer moved towards this direction.
Digital position feedback of the valve for the low endstop
If Actuator_L = TRUE, the valve is at the low endstop and is
no longer moved towards this direction.
Position feedback of the valve
If you are using parameter Feedback, then Con-
fig.FeedbackPerOn = FALSE must be set.
Analog position feedback of a valve
If you are using parameter Feedback_PER, then Con-
fig.FeedbackPerOn = TRUE must be set.
Feedback_PER is scaled based on the tags:
Config.FeedbackScaling.LowerPointIn
•
Config.FeedbackScaling.UpperPointIn
•
Config.FeedbackScaling.LowerPointOut
•
Config.FeedbackScaling.UpperPointOut
•
Disturbance variable or precontrol value
A FALSE -> TRUE edge activates "manual mode", while
•
State = 4, Mode remains unchanged.
As long as ManualEnable = TRUE, you cannot change the
operating mode via a rising edge at ModeActivate or use
the commissioning dialog.
A TRUE -> FALSE edge activates the operating mode that
•
is specified by Mode.
We recommend that you change the operating mode using
ModeActivate only.
In manual mode, the absolute position of the valve is speci-
fied. ManualValue is only evaluated if you are using Out-
put_PER, or if position feedback is available.
Function Manual, 03/2017, A5E35300227-AC
PID control