Siemens SIMATIC S7-1200 Function Manual page 397

Tag
SubstituteOutput
PidOutputSum
PID control
Function Manual, 03/2017, A5E35300227-AC
Data type Default
REAL 0.0
REAL 0.0
Description
The substitute output value is used as PID output value as
long as the following conditions are met:
One or more errors are pending in automatic mode for
•
which ActivateRecoverMode is in effect
SetSubstituteOutput = TRUE
•
ActivateRecoverMode = TRUE
•
The values at the outputs for heating and cooling resulting
from the substitute output value are the result of the con-
figured output scaling (structures Config.Output.Heat and
Config.Output.Cool).
For controllers with activated cooling output (Con-
fig.ActivateCooling = TRUE), define:
a positive substitute output value to output the value at
•
the outputs for heating
a negative substitute output value to output the value
•
at the outputs for cooling
The permitted value range is determined by the configura-
tion.
Cooling output deactivated (Config.ActivateCooling =
•
FALSE):
Config.Output.Heat.PidUpperLimit ≥ SubstituteOutput
≥ Config.Output.Heat.PidLowerLimit
Cooling output activated (Config.ActivateCooling =
•
TRUE):
Config.Output.Heat.PidUpperLimit ≥ SubstituteOutput
≥ Config.Output.Cool.PidLowerLimit
PID output value
PidOutputSum displays the output value of the PID algo-
rithm. Depending on the operating mode, it is either calcu-
lated automatically or defined by the manual value or the
configured substitute output value.
The values at the outputs for heating and cooling resulting
from the PID output value are the result of the configured
output scaling (structures Config.Output.Heat and Con-
fig.Output.Cool).
The PidOutputSum is limited as defined in the configura-
tion.
Cooling output deactivated (Config.ActivateCooling =
•
FALSE):
Config.Output.Heat.PidUpperLimit ≥ PidOutputSum ≥
Config.Output.Heat.PidLowerLimit
Cooling output activated (ConfigActivateCooling =
•
TRUE):
Config.Output.Heat.PidUpperLimit ≥ PidOutputSum ≥
Config.Output.Cool.PidLowerLimit
Instructions
9.3 PID_Temp
397