Siemens SIMATIC S7-1200 Function Manual page 405

Tag
Config.Output.Heat.PidLower-
Limit
Config.Output.Heat.Upper-
Scaling
Config.Output.Heat.Lower-
Scaling
PID control
Function Manual, 03/2017, A5E35300227-AC
Data type Default
REAL 0.0
REAL 100.0
REAL 0.0
Description
Low limit of the PID output value for heating
For controllers with deactivated cooling output (Con-
fig.ActivateCooling = FALSE), the PID output value (Pid-
OutputSum) is limited to this low limit.
For controllers with activated cooling output (Config
.ActivateCooling = TRUE), the value must be 0.0.
Heat.PidLowerLimit forms a value pair together with the
following parameters for scaling of the PID output value
(PidOutputSum) to the outputs for heating:
Heat.LowerScaling for OutputHeat
•
Heat.PwmLowerScaling for OutputHeat_PWM
•
Heat.PerLowerScaling for OutputHeat_PER
•
If you want to limit the value at the associated output, you
must also adjust these scaling values.
The permitted value range is determined by the configura-
tion.
Cooling output deactivated (Config.ActivateCooling =
•
FALSE):
Heat.PidLowerLimit < Heat.PidUpperLimit
Cooling output activated (Config.ActivateCooling =
•
TRUE):
Heat.PidLowerLimit = 0.0
Scaled high output value for heating
Heat.UpperScaling and Heat.PidUpperLimit form a value
pair for scaling of the PID output value (PidOutputSum) to
the output value for heating (OutputHeat).
The OutputHeat value is always located between
Heat.UpperScaling and Heat.LowerScaling.
Heat.UpperScaling ≠ Heat.LowerScaling
Scaled low output value for heating
Heat.LowerScaling and Heat.PidLowerLimit form a value
pair for scaling of the PID output value (PidOutputSum) to
the output value for heating (OutputHeat).
The OutputHeat value is always located between
Heat.UpperScaling and Heat.LowerScaling.
Heat.UpperScaling ≠ Heat.LowerScaling
Instructions
9.3 PID_Temp
405