Siemens SIMATIC Manual page 72

Examples for the Temperature Controllers
Parameter
Parameter
INV
DISV
GAIN
TM_LAG1
TM_LAG2
TM_LAG3
AMB_TEM
OUTV
After adding the analog input signal and a load (disturbance variable) and then
multiplying with the process gain, the process values pass through three 1st order
time lags. Finally, the value of the ambient temperature is added.
If the controller is initialized with COM_RST = TRUE, the output variable is set to
OUTV = (INV + DISV) * GAIN + AMB_TEM.
6-8
Comment
Input variable
Disturbance variable
Process gain
Time lag 1
Time lag 2
Time lag 3
Ambient temperature
Output variable
Description
Value of the manipulated variable of the controller
Temperature of the control zone
PID Temperature Control
A5E00125039-02