Siemens SIMATIC S7-1200 Function Manual page 426

Instructions
9.3 PID_Temp
Tag
Retain.CtrlParams.Heat
.ControlZone
Retain.CtrlParams.Heat
.DeadZone
Retain.CtrlParams.Cool.Gain
426
Data type Default
REAL 3.402822e+38
REAL 0.0
REAL 1.0
Description
Active control zone width for heating
The control zone for heating is switched off with
Heat.ControlZone = 3.402822e+38.
Heat.ControlZone is only set automatically during pretun-
ing heating or pretuning heating and cooling if PIDSelf-
Tune.SUT.TuneRuleHeat = 2 is selected as method of the
parameter calculation.
For controllers with deactivated cooling output (Con-
fig.ActivateCooling = FALSE) or controllers with activated
cooling output and cooling factor (Config
.AdvancedCooling = FALSE), the control zone is symmet-
rically located between Setpoint – Heat.ControlZone and
Setpoint + Heat.ControlZone.
For controllers with activated cooling output and PID pa-
rameter switching (Config.ActivateCooling = TRUE, Config
.AdvancedCooling = TRUE), the control zone is located
between Setpoint – Heat.ControlZone and Setpoint +
Cool.ControlZone.
Heat.ControlZone is retentive.
Heat.ControlZone > 0.0
Active dead zone width for heating (see PID parameters
(Page 174))
The dead zone for heating is switched off with
Heat.DeadZone = 0.0.
Heat.DeadZone is not set automatically or adjusted during
tuning. You must correctly configure Heat.DeadZone
manually.
When the dead zone is switched on, the result can be a
permanent control deviation (deviation between setpoint
and process value). This can have a negative effect on
fine tuning.
For controllers with deactivated cooling output (Config
.ActivateCooling = FALSE) or controllers with activated
cooling output and cooling factor (Config
.AdvancedCooling = FALSE), the dead zone is symmetri-
cally located between Setpoint – Heat.DeadZone and
Setpoint + Heat.DeadZone.
For controllers with activated cooling output and PID pa-
rameter switching (Config.ActivateCooling = TRUE, Config
.AdvancedCooling = TRUE), the dead zone is located
between Setpoint – Heat.DeadZone and Setpoint +
Cool.DeadZone.
Heat.DeadZone is retentive.
Heat.DeadZone ≥ 0.0
Active proportional gain for cooling
Cool.Gain is retentive.
Only effective if the cooling output and PID parameter
switching are activated (Config.ActivateCooling = TRUE
and Config.AdvancedCooling = TRUE).
Cool.Gain ≥ 0.0
Function Manual, 03/2017, A5E35300227-AC
PID control