Pid_3Step V1 Input Parameters - Siemens SIMATIC S7-1200 Function Manual

Instructions
9.2 PID_3Step
9.2.5.3

PID_3Step V1 input parameters

Table 9- 10 PID_3Step V1 input parameters
Parameters
Setpoint
Input
Input_PER
Actuator_H
Actuator_L
Feedback
Feedback_PER
ManualEnable
ManualValue
350
Data type Default
REAL 0.0
REAL 0.0
WORD W#16#0
BOOL FALSE
BOOL FALSE
REAL 0.0
WORD W#16#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
•
A FALSE -> TRUE edge selects "Manual mode", while
•
State = 4, Retain.Mode remains unchanged.
A TRUE -> FALSE edge selects the most recently active
•
operating mode
A change of Retain.Mode will not take effect during ManualE-
nable = TRUE. The change of Retain.Mode will only be con-
sidered upon a TRUE -> FALSE edge at ManualEnable .
PID_3Step V1.1If ManualEnable = TRUE when the CPU
starts, PID_3Step starts in manual mode. A rising edge
(FALSE > TRUE) at ManualEnable is not necessary.
PID_3Step V1.0
At the start of the CPU, PID_3Step only switches to manual
mode with a rising edge (FALSE->TRUE) at ManualEnable .
Without rising edge, PID_3Step starts in the last operating
mode in which ManualEnable was FALSE.
In manual mode, you specify the absolute position of the
valve. ManualValue will only be evaluated if you are using
OutputPer, or if position feedback is available.
Function Manual, 03/2017, A5E35300227-AC
PID control