Siemens SIMATIC Manual page 76

Examples for the Temperature Controllers
Parameter
Parameter
INV_UP
INV_DOWN
DISV
GAIN
MTR_TM
LMNR_HLM
LMNR_LLM
TM_LAG1
TM_LAG2
TM_LAG3
AMB_TEM
OUTV
LMNR
QLMNR_HS
QLMNR_LS
Depending on the input signals INV_UP and INV_DOWN, the position feedback
signal LMNR is calculated by an integrator. The position feedback signal is limited
to LMNR_HLM and LMNR_LLM. When the limit is reached, the limit stop signals
QLMNR_HS or QLMNR_LS are set.
After adding a disturbance variable and then multiplying by the process gain, the
process values pass through three 1st order time lag elements.
If the controller is initialized with COM_RST = TRUE, the output variable is set to
OUTV = (LMNR + DISV)*GAIN + AMB_TEM.
6-12
Comment
input variable up
input variable down
disturbance variable
process gain
motor actuating time
actuator value high
limit
actuator value low limit
time lag 1
time lag 2
time lag 3
ambient temperature
output variable
position feedback
signal
high limit stop signal
low limit stop signal
Description
with temperature processes:
×
TM_LAG1 = 10...100
= 0 with temperature processes
temperature
TM_LAG2)
PID Temperature Control
A5E00125039-02