Siemens SIMATIC S7-1200 Function Manual page 392

Instructions
9.3 PID_Temp
Parameter Data type Default
SetpointLimit_L BOOL
InputWarning BOOL
_H
InputWarning BOOL
_L
State INT
Error BOOL
ErrorBits DWORD
392
Description
FALSE If SetpointLimit_L = TRUE, the absolute setpoint low limit is reached (Set-
point ≤ Config.SetpointLowerLimit) or Setpoint ≤ Config.InputLowerLimit.
The setpoint low limit is the maximum of Config.SetpointLowerLimit and Con-
fig.InputLowerLimit.
FALSE If InputWarning_H = TRUE, the process value has reached or exceeded the
warning high limit (ScaledInput ≥ Config.InputUpperWarning).
FALSE If InputWarning_L = TRUE, the process value has reached or fallen below the
warning low limit (ScaledInput ≤ Config.InputLowerWarning).
0 The PID_Temp state and mode parameters (Page 430) shows the current
operating mode of the PID controller. You can change the operating mode
using the input parameter Mode and a rising edge at ModeActivate. For pre-
tuning and fine tuning, you specify with Heat.EnableTuning and
Cool.EnableTuning whether tuning takes place for heating or cooling.
State = 0: Inactive
•
State = 1: Pretuning
•
State = 2: Fine tuning
•
State = 3: Automatic mode
•
State = 4: Manual mode
•
State = 5: Substitute output value with error monitoring
•
FALSE If Error = TRUE, at least one error message is pending in this cycle.
DW#16#0 The PID_Temp ErrorBits parameter (Page 439) shows the pending error
messages.
ErrorBits is retentive and is reset with a rising edge at Reset or ErrorAck.
Function Manual, 03/2017, A5E35300227-AC
PID control