Rockwell Automation 1746-BTM Barrel Temperature Control Module User Manual - Manual (Page 13)

1 Publication 1746-UM010B-EN-P - April 2001
Chapter
1
Getting Started
This chapter gives you information on:
•
the function of the temperature control module
•
features of the temperature control module
•
time–proportioned output (TPO)
•
module addressing
•
response to slot disabling
Temperature Control Using
a BTM Module in an SLC
System The temperature control module is an intelligent I/O module that can
provide a maximum of 4 PID loops for temperature control. The
module has 4 analog thermocouple (TC) inputs. Each analog input
functions as the process variable (PV) for a PID loop. The PID
algorithm and tuning–assisted–process (TAP) algorithm are performed
on the module for each of the loops. The control–variable (CV)
output of each loop, either analog output or time–proportioned
output (TPO), is sent from the module to the SLC data table. Your
application ladder logic must access the CV value in the data table and
send the analog or TPO data to an output module to close the loop.
Figure 1.1
A 1746–BTM module with 4 PID logic channels, showing one complete PID loop
ATTENTION
!
Use the 1746–BTM module only for barrel
temperature control for injection molding
applications or extruders in a local I/O chassis. Any
other applications are not supported.
SLC data table
output module
analog or TPO
loop logic
loop logic
loop logic
loop logic
process to be
controlled
heater
TC
CV
CV
CV
CV
CV
CV
PV
PV
PV
PV
CV