Siemens SIMATIC Manual page 67

Process Block for Simulation of a Temperature Heating Zone
The block simulates a typical temperature process for heating that can occur as a
control zone in an extruder, an injection molding machine, an annealing machine or
as a separate furnace.
The following schematic shows the block diagram of the process PROC_P:
DISV
HEAT_P
100
+
0
Parameter
Parameter
HEAT_P
DISV
GAIN
TM_LAG1
TM_LAG2
TM_LAG3
AMB_TEM
OUTV
The binary input signals are converted to continuous floating-point values (0 or
100). After adding the disturbance variable and multiplying by the process gain, the
process values pass through three 1st order time lag elements. 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 = DISV*GAIN + AMB_TEM.
PID Temperature Control
A5E00125039-02
GAIN
TM_LAG1
Comment
Heating pulse
Disturbance variable
Process gain
Time lag 1
Time lag 2
Time lag 3
Ambient temperature
Output variable
Examples for the Temperature Controllers
TM_LAG2 TM_LAG3
Description
Binary heating input signal
temperature of the control zone
AMB_TEM
+
OUTV
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