Siemens SIMATIC S7-1200 Function Manual page 417

Tag
PIDSelfTune.SUT.CoolingMode INT
PID control
Function Manual, 03/2017, A5E35300227-AC
Data type Default
0
Description
The CoolingMode tag determines the manipulated variable
output to determine the cooling parameters (for pretuning
heating and cooling).
Options are:
SUT.CoolingMode = 0:
•
Switch off heating and switch on cooling after reaching
the setpoint.
The SUT.State = 700 phase is skipped.
Phase SUT.State = 500 is followed by phase
SUT.State = 900.
This option can improve the control response if the
gain of the cooling actuator is low compared to the
gain of the heating actuator. It results in a shorter tun-
ing time than with SUT.CoolingMode = 1 or 2.
SUT.CoolingMode = 1:
•
Switch on cooling in addition to heating after reaching
the setpoint.
The SUT.State = 700 phase is skipped.
Phase SUT.State = 500 is followed by phase
SUT.State = 800.
This option can improve the control response if the
gain of the cooling actuator is high compared to the
gain of the heating actuator.
SUT.CoolingMode = 2:
•
After heating up to the setpoint, a decision is automati-
cally made in phase SUT.State = 700 as to whether
heating is switched off. Phase SUT.State = 500 is fol-
lowed by phase SUT.State = 700 and then SUT.State
= 800 or SUT.State = 900.
This option requires more time than options 0 and 1.
Instructions
9.3 PID_Temp
417