Siemens SIMATIC S7-1200 - Page 649

Technology instructions
10.2 PID control
S7-1200 Programmable controller
System Manual, V4.2, 09/2016, A5E02486680-AK
649
Setting
TO-DB parameter
Data
type
Value range
Description
Control
Zone (cool-
ing)
3,4
"Retain.CtrlParams.
Cool.ControlZone"
Real ControlZone> 0.0 Width of the control
deviation zone for cool-
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.