Siemens SIMATIC S7-1200 Manual page 168

PID is easy
8.2 PID_Compact instruction
Table 8- 4 Data types for the parameters
Parameter and type
Setpoint IN
Input IN
Input_PER IN
ManualEnable IN
ManualValue IN
Reset IN
ScaledInput OUT
Output OUT
1
Output_PER OUT
1
Output_PWM OUT
1
SetpointLimit_H OUT
SetpointLimit_L OUT
InputWarning_H OUT
InputWarning_L OUT
168
Data type Description
Real Setpoint of the PID controller in automatic mode. Default value: 0.0
Real Process value. Default value: 0.0
You must also set sPid_Cmpt.b_Input_PER_On = FALSE.
Word Analog process value (optional). Default value: W#16#0
You must also set sPid_Cmpt.b_Input_PER_On = TRUE.
Bool Enables or disables the manual operation mode. Default value: FALSE
On the edge of the change from FALSE to TRUE, the PID controller

switches to manual mode, State = 4, and sRet.i_Mode remains
unchanged.
On the edge of the change from TRUE to FALSE, the PID controller

switches to the last active operating mode and State = sRet.i_Mode.
Real Process value for manual operation. Default value: 0.0
Bool Restarts the controller. Default value: FALSE
If Reset = TRUE, the following applies:
Inactive operating mode

Input value = 0

Integral part of the process value = 0

Intermediate values of the system are reset (PIDParameter is

retained)
Real Scaled process value. Default value: 0.0
Real Output value. Default value: 0.0
Word Analog output value. Default value: W#16#0
Bool Output value for pulse width modulation. Default value: FALSE
Bool Setpoint high limit. Default value: FALSE
If SetpointLimit_H = TRUE, the absolute upper limit of the setpoint is
reached. Default value: FALSE
Bool Setpoint low limit. Default value: FALSE
If SetpointLimit_L = TRUE, the absolute lower limit of the setpoint is
reached. Default value: FALSE
Bool If InputWarning_H = TRUE, the process value reached or exceeded the
upper warning limit. Default value: FALSE
Bool If InputWarning_L = TRUE, the process value reached the lower
warning limit. Default value: FALSE
Easy Book
Manual, 11/2011, A5E02486774-04