Siemens SIMATIC S7-1200 - Page 645

Technology instructions
10.2 PID control
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
645
PID parameters
The “Advanced settings” view, "PID Parameters” section is shown below with the cooling
and/or “PID parameterswitchover” feature deactivated.
Setting
TO-DB parameter
Data
type
Value range
Description
Enable
manual
entry
"Retain.CtrlParams.
SetByUser"
Bool Bool You must check this
checkbox to enter PID
parameters manually.
Proportional
gain (heat-
ing)
2
"Retain.CtrlParams.
Heat.Gain"
Real Gain >= 0.0 PID proportional gain
for heating
Integral
action time
(heating)
1,2
"Retain.CtrlParams.
Heat.Ti"
Real 100000.0 >=
Ti >= 0.0
PID integral action for
heating.
Derivative
action time
(heating)
1,2
"Retain.CtrlParams.
Heat.Td"
Real 100000.0 >=
Td >= 0.0
PID derivative action
time for heating.
Derivative
delay coeffi-
cient(heatin
g)
2
"Retain.CtrlParams.
Heat.TdFiltRatio"
Real TdFiltRatio >=
0.0
PID derivative delay
coefficient for heating
that defines the deriva-
tive lag time as coeffi-
cient from the PID
derivative time.
Proportional
action
weighting(h
eating)
2
"Retain.CtrlParams.
Heat.PWeighting"
Real 1.0 >=PWeighting
>= 0.0
Weighting of the PID
proportional gain for
heating in either direct-
or loopback- control
path.
Derivative
action
weighting
(heating)
2
"Retain.CtrlParams.
Heat.DWeighting"
Real 1.0 >=DWeighting
>= 0.0
Weighting of the PID
derivative part for heat-
ing in either direct- or
loopback- control path.