Rockwell Automation 1771-TCM TEMPERATURE CONTROL User Manual

Page 10

1–3

Interfacing with the Temperature Control Module

Publication 1771Ć6.4.5 - January 1997

The following graphic illustrates how the individual data blocks are
sent to and returned from the TCM module.

Configuration Block for Loop 2

26 words

Configuration Block for Loop 1

26 words

Configuration Block for Loop 3

26 words

Configuration Block for Loop 4

26 words

Configuration Block for Loop 5

26 words

Configuration Block for Loop 6

26 words

Configuration Block for Loop 7

26 words

Configuration Block for Loop 8

26 words

Gains Block

57 words

System Status Block

64 words

Calibration Write Block

20 words

AutoĆTune Block

57 words

1771ĆTCM Module

PLC Data Table

Input Byte

BlockĆTransfer

Calibration Read Block

14 words

BlockĆTransfer

Output Byte

Dynamic Block

34 words

BlockĆTransfer

SingleĆTransfer

The computer with the Temperature Control software communicates
with the PLC processor across a local DH+ link or a DF1 serial link.

Important: For configuring temperature control loops, you can not

have the computer on one DH+ link and have the PLC
processor on another (remote) DH+ link even if they are
in the same DH+ network.

As shown in the following graphic, after entering configuration
selections at the computer, you can download them to disk files
and/or the PLC processor’s data-table interface area for use by the
module. Later, you can upload configuration selections from either
the disk files or the PLC processor’s data-table interface area for
making changes.

How the Temperature

Control Software

Interfaces with PLC

Processors