Siemens SIMATIC S7-1200 - Page 634

Technology instructions
10.2 PID control
S7-1200 Programmable controller
634 System Manual, V4.2, 09/2016, A5E02486680-AK
Autotuning of temperature processes
The PID_Temp instruction provides two modes for auto tuning:
● “Pretuning” (parameter “Mode” = 1)
● “Finetuning” (parameter “Mode” = 2)
Depending on the controller configuration, different variants of these tuning methods are
available:
Configuration
Controller with heating
output
Controller with heating and
cooling output using cool-
ing factor
Controller with heating and
cooling output using two
sets of PID parameters
Associated
TO-DB values
• Config.ActivateCooling
= FALSE
• Con-
fig.AdvancedCooling
= irrelevant
• Config.ActivateCooling
= TRUE
• Con-
fig.AdvancedCooling =
FALSE
• Config.ActivateCooling
= TRUE
• Con-
fig.AdvancedCooling =
TRUE
Available tun-
ing methods
• “Pretuning heating”
• “Fine tuning heating"
(cooling offset cannot
be used)
• “Pretuning heating”
• “Fine tuning heating"
(cooling offset can be
used)
• “Pretuning heating and
cooling”
• "Pretuning heating”
• “Pretuning cooling”
• “Fine tuning heating”
(cooling offset can be
used)
• “Fine tuning cooling”
(heating offset can be
used)