Manual

Chapter 2
1
Chapter
1-1
Overview of the Temperature Control Module
This chapter gives you information on:
the function of the barrel temperature control module
features of the barrel temperature control module
how the module communicates with PLC processors
The temperature control module is an intelligent I/O module that can
provide a maximum of 8 PID loops for temperature control. The module
has 8 analog inputs. Each analog input functions as the process variable
(PV) for a PID loop. The PID algorithm is performed on the module for
each of the loops. The control-variable (CV) output of each loop is sent
from the module to the PLC data table. The ladder logic must send the
control variable to an output module to close the loop.
Figure 1.1
A
1771TCM Module with 8 PID Logic Channels, showing one complete
PID Loop
PID Logic
CV PV
PID Logic
CV PV
PID Logic
CV PV
PID Logic
CV PV
PID Logic
CV PV
PID Logic
CV PV
PID Logic
CV PV
PID Logic
CV PV
1771TCM Module
Output Module
PLC Data Table
Sensor
CV
Actuator
CV
Temperature
Control
Process
Chapter Objectives
PID Loops for Temperature
Control