Siemens SIMATIC S7-1200 - Page 647

Technology instructions
10.2 PID control
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
647
Setting
TO-DB parameter
Data
type
Value range
Description
Controller
structure
(heating)
"PIDSelfTune.SUT.
TuneRuleHeat",
"PIDSelfTune.TIR.
TuneRuleHeat"
Int "PIDSelf-
Tune.SUT.
TuneRuleHeat"
= 0..2,
"PIDSelf-
Tune.TIR.
TuneRuleHeat"
= 0..5
You can select the
tuning algorithm for
heating.
Possible selections:
• PID (Temperature)
(=default)
("PIDSelfTune.SUT.
TuneRuleHeat" = 2)
("PIDSelfTune.TIR.
TuneRuleHeat" = 0)
• PID
("PIDSelfTune.SUT.
TuneRuleHeat" = 0)
("PIDSelfTune.TIR.
TuneRuleHeat" = 0)
• PI
("PIDSelfTune.SUT.
TuneRuleHeat" = 1)
("PIDSelfTune.TIR.
TuneRuleHeat" = 4)
Any other combination
shows “User defined”,
but “User defined” is
not provided by default.
“PID (Temperature)” is
new for PID_Temp,
with a specific pretun-
ing (SUT) method for
temperature processes.
Proportional
gain (cool-
ing)
4
"Retain.CtrlParams.
Cool.Gain"
Real Gain >= 0.0 PID proportional gain
for cooling
Integral
action time
(cooling)
1,4
"Retain.CtrlParams.
Cool.Ti"
Real 100000.0 >=Ti
>= 0.0
PID integral action for
cooling
Derivative
action time
(cooling)
1,4
"Retain.CtrlParams.
Cool.Td"
Real 100000.0 >=Td
>= 0.0
PID derivative action
time for cooling
Derivative
delay coeffi-
cient (cool-
ing)
4
Retain.CtrlParams.
Cool.TdFiltRatio"
Real TdFiltRatio>= 0.0 PID derivative delay
coefficient for cooling
that defines the deriva-
tive lag time as a coef-
ficient from the PID
derivative time.