Rockwell Automation 1746-NR8 SLC 500 RTD/Resistance Input Module User Manual - Manual (Page 49)

1 Publication 1746-UM003A-EN-P
Chapter
4
Channel Configuration, Data, and Status
This chapter examines the channel configuration word and the channel status
word bit by bit, and explains how the module uses configuration data and
generates status during operation. It gives you information about how to:
•
configure a channel
•
examine channel input data
•
check a channel’s status
Channel Configuration The channel configuration word is a part of the RTD module’s output image
as shown in the illustration below. Output words 0 through 7 correspond to
channels 0 through 7 on the module. Setting the condition of bits 0 through
15 in these words via your ladder logic program causes the channel to operate
as you choose (for example, RTD type, reading in °C). Output words 8
through 23 (Class 3 only) are used to further define the channel configuration
to allow you to choose a scaling format other than the module default when
using the proportional counts data format. You can use words 8 and 9 to define
a user-set range for channel 0, words 10 and 11 for channel 1, etc.
A bit-by-bit examination of the configuration word is provided in the table on
page 4-5. Programming is discussed in Chapter 5. Addressing is explained in
Chapter 3.