Siemens SIMATIC S7 System Manual page 333

Parameter and type
Actuator_L IN
Reset IN
ScaledInput OUT
ScaledFeedback OUT
Output_PER OUT
Output_UP OUT
Output_DN OUT
SetpointLimitH OUT
SetpointLimitL OUT
InputWarningH OUT
InputWarningL OUT
State OUT
Error OUT
ErrorBits OUT
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05
Data type Description
Bool If Actuator_L = TRUE, the valve is at the lower end stop and is no
longer moved in this direction. Default value: FALSE
Bool Restarts the PID controller. Default value: FALSE
If Reset = TRUE:
"Inactive" operating mode

Input value = 0

Interim values of the controller are reset. (PID parameters are

retained.)
Real Scaled process value
Real Scaled valve position
Word Analog output value. If Config.OutputPerOn = TRUE, then Output_PER
is evaluated.
Bool Digital output value for opening the valve. Default value: FALSE
If Config.OutputPerOn = FALSE, then parameter Output_UP is
evaluated.
Bool Digital output value for closing the valve. Default value: FALSE
If Config.OutputPerOn = FALSE, then parameter Output_DN is
evaluated.
Bool Setpoint high limit. Default value: FALSE
If SetpointLimitH = TRUE, the absolute upper limit of the setpoint is
reached. In the CPU, the setpoint is limited to the configured absolute
upper limit of the actual value.
Bool Setpoint low limit. Default value: FALSE
If SetpointLimitL = TRUE, the absolute lower limit of the setpoint is
reached. In the CPU the setpoint is limited to the configured absolute
lower limit of the actual value.
Bool If InputWarningH = TRUE, the input value has reached or exceeded the
upper warning limit. Default value: FALSE
Bool If InputWarningL = TRUE, the input value has reached or exceeded the
lower warning limit. Default value: FALSE
Int Current operating mode of the PID controller. Default value: 0
Use Retain.Mode to change the operating mode:
State = 0: Inactive

State = 1: Pretuning

State = 2: Manual fine tuning

State = 3: Automatic mode

State = 4: Manual mode

State = 5: Safety mode

State = 6: Output value measurement

State = 7: Safety mode monitoring with active trigger

State = 8: Inactive mode monitoring with active trigger

Bool If Error = TRUE, at least one error message is pending. Default value:
FALSE
DWord Error message. Default value: DW#16#0000 (no error)
102BTechnology instructions
9.2 PID control
333