Rockwell Automation 1771-TCM TEMPERATURE CONTROL - Manual (Page 8)

Chapter
1
Publication 1771Ć6.4.5 - January 1997
Interfacing with the
Temperature Control Module
This chapter describes how to interface the Temperature Control
module through the PLC processor to the configuration software.
This includes:
•
how the Temperature Control module configuration software
interacts with the PLC processor and the Temperature Control
module
•
sample ladder logic (utility ladder logic provided)
•
using the sample ladder logic program
•
how the Temperature Control module communicates with the
PLC processor
•
how the Temperature Control software interfaces with PLC
processors
•
block-transfer programming
•
data-table interface area
•
communication control bits
The Temperature Control module configuration software provides
easy-to-use screens to help you configure, tune, and operate
temperature control modules. The configuration software does not
communicate or transfer data directly with the module. Instead, the
software reads data from and writes data into an area of the PLC’s
data table, called the data table block. If you have multiple modules,
each must have a separate data table block.
The utility ladder logic running on the PLC processor then transfers
this data to or from the module using block transfer instructions.
You can select the area of the data table to be used by the software,
but the arrangement of the data within the data table block is fixed
by this software.
Utility ladder logic is provided with the configuration software. We
recommend that you use this utility ladder logic, since it contains all
the necessary block transfers and control instructions needed to use
the configuration software with the Temperature Control module,
and has been tested to operate correctly with both the module and the
software.
How the Temperature
Control Module
Configuration Software
Interacts with the PLC
Processor and the
Temperature Control
Module
Sample Ladder Logic