Rockwell Automation 1746-NI16V SLC 500 Analog Input Modules User Manual - Manual (Page 41)

Publication 1746-UM001A-US-P
Preliminary Operating Considerations 4-5
Output Image - Configuration Words
The module output image (defined as the output from the
processor to the module) contains information that you configure
to define the way a specific module channel works. Each output
word configures a single channel.
Example - If you want to configure channel 2 on the analog module
located in slot 4 in the chassis, your address would be O:4.2.
Chapter 5, Channel Configuration, Data, and Status, gives you
detailed bit information about the data content of the configuration
word. Also, see Chapter 7 for a detailed explanation and application
examples.
Input Image - Data Words and Status Words
The input image (defined as the input word from the module to the
processor) represents data words and status words.
Input words hold the input data that represent the value of analog
inputs for channels 0-15. This data word is valid only when the
channel is enabled and there are no channel errors.
Class 1 Input Words - Data
The data words for Class 1 are input words 0 through 7. Setting bits 1
and 0 in the output configuration word to 00 or 01 returns the data for
channels 0 through 7 or 8 through 15, respectively. Class 1 data mode
only returns a 14-bit integer ±3 LSB of the Class 3 resolution. The
remaining 2 bits, bits 1 and 0, indicate whether the input word is data
or status for channels 0 through 7 or 8 through 15.
Class 3 Input Words - Data
The data words for Class 3 are the input words 0 through 15. Data for
all 16 channels can be viewed simultaneously, and all data words are
16-bit integer values.
Input words also contain the status of channels 0 through 15. The
status bits for a particular channel reflect the configuration settings
that you entered into the output image configuration word for that
O : 4 . 2
Word
File Type
Word Delimiter Element Delimiter
Slot