Siemens SIMATIC S7-1200 Function Manual page 400

Instructions
9.3 PID_Temp
Tag
Config.InputUpperLimit
Config.InputLowerLimit
Config.InputUpperWarning
Config.InputLowerWarning
400
Data type Default
REAL 120.0
REAL 0.0
REAL 3.402822e+38
REAL -3.402822e+38 Warning low limit of the process value
Description
High limit of the process value
Input and Input_PER are monitored to ensure adherence
to this limit. If the limit is exceeded, an error is output and
the reaction is determined by ActivateRecoverMode.
At the I/O input, the process value can be a maximum of
18% higher than the nominal range (overrange). This
means the limit cannot be exceeded when you use an I/O
input with the pre-setting for high limit and process value
scaling.
When pretuning is started, the difference between high
and low limit of the process value is checked to determine
whether the distance between setpoint and process value
meets the necessary requirements.
InputUpperLimit > InputLowerLimit
Low limit of the process value
Input and Input_PER are monitored to ensure adherence
to this limit. If the limit is undershot, an error is output and
the reaction is determined by ActivateRecoverMode.
InputLowerLimit < InputUpperLimit
Warning high limit of the process value
Input and Input_PER are monitored to ensure adherence
to this limit. If the limit is exceeded, a warning is output at
the Warning parameter.
If you set InputUpperWarning outside the process
•
value limits, the configured absolute process value
high limit is used as the warning high limit.
If you configure InputUpperWarning within the process
•
value limits, this value is used as the warning high lim-
it.
InputUpperWarning > InputLowerWarning
Input and Input_PER are monitored to ensure adherence
to this limit. If the limit is undershot, a warning is output at
the Warning parameter.
If you set InputLowerWarning outside the process
•
value limits, the configured absolute process value low
limit is used as the warning low limit.
If you configure InputLowerWarning within the process
•
value limits, this value is used as the warning low limit.
InputLowerWarning < InputUpperWarning
Function Manual, 03/2017, A5E35300227-AC
PID control