Siemens Simatic S7-1500 - Page 405

Instructions
9.3 PID_Temp
PID control
Function Manual, 03/2017, A5E35300227-AC
405
Tag
Data type
Default
Description
Config.Output.Heat.PidLower-
Limit
REAL 0.0 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
Config.Output.Heat.Upper-
Scaling
REAL 100.0 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
Config.Output.Heat.Lower-
Scaling
REAL 0.0 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