Siemens SIMATIC S7-1200 - Page 646

Technology instructions
10.2 PID control
S7-1200 Programmable controller
646 System Manual, V4.2, 09/2016, A5E02486680-AK
Setting
TO-DB parameter
Data
type
Value range
Description
Sampling
time of PID
algorithm
(heating)
1,2
"Retain.CtrlParams.
Heat.Cycle"
Real 100000.0
>=Cycle
> 0.0
Internal call cycle of the
PID controller for heat-
ing.
Rounded to an integer
multiple of the FB call
cycle time.
Deadband
width(heatin
g)
2,3
"Retain.CtrlParams.
Heat.DeadZone"
Real DeadZone>= 0.0 Width of the deadband
for heating control
deviation.
Control
Zone (heat-
ing)
2,3
"Retain.CtrlParams.
Heat.ControlZone"
Real ControlZone> 0.0 Width of the control
deviation zone for heat-
ing where PID control is
active. If control devia-
tion leaves this range,
output is switched to
maximum output val-
ues.
Default value is
"MaxReal" so control
zone is deactivated as
long as autotuning is
not executed.
Value "0.0" is prohibit-
ed for Control Zone;
with the value "0.0",
PID_Temp behaves like
a two-position controller
that is always heating
or cooling at full power.