Siemens Simatic S7-1500 - Page 411

Instructions
9.3 PID_Temp
PID control
Function Manual, 03/2017, A5E35300227-AC
411
Tag
Data type
Default
Description
Config.Output.Cool.Minimum-
OffTime
REAL 0.0 Minimum off time of the pulse width modulation for cooling
(OutputCool_PWM output)
A PWM pause is never shorter than this value.
The value is rounded off to:
Cool.MinimumOffTime = n × CycleTime.Value
Cool.MinimumOffTime is only effective if the output for
cooling OutputCool_PWM is selected (Cool.Select = 1).
Only effective if the cooling output is activated (Config
.ActivateCooling = TRUE).
100000.0 ≥ Cool.MinimumOffTime ≥ 0.0
If you are using PID_Temp in a cascade, the master controller and slave controller exchange information via the Master
and Slave parameters.
You need to make the interconnection. For details, see the Master parameter.
Config.Cascade.IsMaster BOOL FALSE The controller is master in a cascade and provides the
slave setpoint.
Set IsMaster = TRUE if you are using this PID_Temp in-
stance as master controller in a cascade.
A master controller defines the setpoint of a slave control-
ler with its output. A PID_Temp instance can be master
controller and slave controller at the same time.
If the controller is used as master controller, the cooling
output must be deactivated (Config.ActivateCooling =
FALSE).
Config.Cascade.IsSlave BOOL FALSE The controller is slave in a cascade and receives its set-
point from the master.
Set IsSlave = TRUE if you are using this PID_Temp in-
stance as slave controller in a cascade.
A slave controller receives its setpoint (Setpoint parame-
ter) from the output of its master controller (OutputHeat
parameter). A PID_Temp instance can be master control-
ler and slave controller at the same time.
Config.Cascade.AntiWindUp-
Mode
INT 1 Anti-windup behavior in the cascade
Options are:
• Anti-windup = 0
The AntiWindUp functionality is deactivated. The mas-
ter controller does not respond to the limit of its slave
controllers.
• Anti-windup = 1
The integral action of the master controller is reduced
in the ratio "Slaves in limit" to "Number of slaves"
("CountSlaves" parameter). This reduces the effects of
the limitation on the control behavior.
• Anti-windup = 2
The integral action of the master controller is held as
soon as a slave controller is in the limit.
Only effective if the controller is configured as master
controller (Config.Cascade.IsMaster = TRUE).