Rockwell Automation 1771-TCM,D17716.5.108 TEMPERATURE CONTROL MOD - Manual (Page 23)

Chapter
3
3-1
Communicating With Your Module
In this chapter, we describe
I/O image
communication sequence
single-transfer programming
block-transfer programming
module update period
The temperature control module uses a word of input image table and a
word of output image table.
Output Image Table
Input Image Table
High Byte Low Byte
High Byte Low Byte
For blockĆtransfer
instructions, address
the low byte (0)
To read the 8 heat TPO bits or 8 cool TPO bits
singleĆtransferred from the module, read the bits of
the high (1) input byte. The control bits determine
whether these bits represent a heating function or
a cooling function at any given time.
For singleĆtransfer control, write to the high
(1) output byte (control bits) and read from
the low (0) input byte (control bits)
The low byte of the output image word is used exclusively for
block-transfer.
The high byte of the output image word is used exclusively for
single-transfer. You address these bits to control whether the
single-transfer input is for a heating function or a cooling function.
Chapter Objectives
I/O Image