Chapter 3 Module Memory Map; Input Image; Accessing Input Image File Data - Allen-Bradley CompactBlock LDX 1790D-T4T0 User Manual

Module Memory Map

Input Image

File
Accessing Input Image
File Data
1
Module Data, Status, and Channel Configuration
for DeviceNet
After installation of the thermocouple/mV 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
The module uses five input words for data and status bits (input image).
Figure 3.1 Memory Map
Input Image
5 words
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.
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.
AB Drives
Channel 0 Data Word
Channel 1 Data Word
Channel 2 Data Word
Channel 3 Data Word
Status Bits
3
Chapter
Word 0
Word 1
Word 2
Word 3
Word 4
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