Rockwell Automation 1790P-4R0 CompactBlock LDX I/O RTD/Resistance Input Module - Manual (Page 31)

1 Publication 1790-UM002A-EN-P
Chapter
3
Module Data, Status, and Channel Configuration
for DeviceNet
After installation of the RTD/resistance input module, you must configure
it for operation, usually using the programming software compatible with
the controller (for example, RSLogix 500™ or RSLogix 5000™) or scanner
(RSNetWorx for DeviceNet). Once configuration is complete and reflected
in ladder logic, you will need to get the module up and running and then
verify its operation. This chapter includes information on the following:
•
module memory map
•
accessing input image file data
•
configuring channels
•
running the module
Module Memory Map The module uses five input words for data and status bits (input image).
Input Image
The input image file represents data words and status words. Input words
0 through 3 hold the input data that represents the value of the analog
inputs for channels 0 through 3. These data words are valid only when
the channel is enabled and there are no errors. Input word 4 holds status
bits.
Accessing Input Image
File Data Five words of the processor input image table are reserved for the
module’s image data. You can access the information in the input image
file using the programming software configuration screen.
Channel 0 Data Word
Word 0
Word 1
Word 2
Word 3
Word 4
Channel 1 Data Word
Channel 2 Data Word
Channel 3 Data Word
Input Image
5 words
Input Image
File
Memory Map
Status Bits
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