Siemens SIMATIC S7-1200 Function Manual page 401

Tag
Config.SetpointUpperLimit
Config.SetpointLowerLimit
Config.ActivateCooling
PID control
Function Manual, 03/2017, A5E35300227-AC
Data type Default
REAL 3.402822e+38
REAL -3.402822e+38 Low limit of the setpoint
BOOL FALSE
Description
High limit of setpoint
Setpoint and SubstituteSetpoint are monitored to ensure
adherence to this limit. If the limit is exceeded, a warning
is output at the Warning parameter.
If you configure SetpointUpperLimit outside the pro-
•
cess value limits, the configured absolute process val-
ue high limit is used as the setpoint high limit.
If you configure SetpointUpperLimit within the process
•
value limits, this value is used as the setpoint high lim-
it.
SetpointUpperLimit > SetpointLowerLimit
Setpoint and SubstituteSetpoint are monitored to ensure
adherence to this limit. If the limit is undershot, a warning
is output at the Warning parameter.
If you set SetpointLowerLimit outside the process val-
•
ue limits, the configured process value absolute low
limit is used as the setpoint low limit.
If you configure SetpointLowerLimit within the process
•
value limits, this value is used as the setpoint low limit.
SetpointLowerLimit < SetpointUpperLimit
Activate cooling output
Config.ActivateCooling = FALSE
•
Only the outputs for heating are used.
Config.ActivateCooling = TRUE
•
The outputs for heating and cooling are used.
If you are using the cooling output, the controller must not
be configured as master controller (Con-
fig.Cascade.IsMaster must be FALSE) .
Instructions
9.3 PID_Temp
401