Rockwell Automation 1746-NI8 SLC 500 Analog Input Modules User Manual - Manual (Page 42)

Chapter
5
Publication 1746Ć6.8 - April 1997
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
•
scale the channel data
•
check a channel’s status
The channel configuration word is a part of the 1746-NI8 module’s
output image as shown below. The module output image uses 8
word values when the module is in Class 1 mode, and 12 word
values when the module is in Class 3 mode. A description of the
output image is shown below.
1746ĆNI8 Module Output Image - Channel Configuration
Class 1 Class 3
O:e.0 channel 0 configuration word bit mapped field • •
O:e.1 channel 1 configuration word bit mapped field • •
O:e.2 channel 2 configuration word bit mapped field • •
O:e.3 channel 3 configuration word bit mapped field • •
O:e.4 channel 4 configuration word bit mapped field • •
O:e.5 channel 5 configuration word bit mapped field • •
O:e.6 channel 6 configuration word bit mapped field • •
O:e.7 channel 7 configuration word bit mapped field • •
O:e.8 lower scale limit range 0 16 bit integer •
O:e.9 upper scale limit range 0 16 bit integer •
O:e.10 lower scale limit range 1 16 bit integer •
O:e.11 upper scale limit range 1 16 bit integer •
After module installation (and voltage or current is selected via the
DIP switches) each channel must be configured to establish the way
the channel operates. You configure the channel by entering bit
values into the configuration word using your programming device.
A bit-by-bit examination of the configuration word is provided in the
chart on page
5–2. Programming is discussed in chapter 6.
Addressing is explained in chapter 4.
The configuration word default setting is all zeros.
Channel Configuration