Publication 1785-UM012D-EN-P - July 2005
4-6 Addressing I/O and Controller Memory
When planning your system design, consider the densities of the I/O modules
you are using and choose an addressing mode that most efficiently uses
controller memory.
Example of Efficient I/O Image Table Use.
Define the addressing mode for each I/O chassis by setting the chassis
backplane switch assembly. For more information, see Appendix E.
2-slot addressing (2 I/O chassis slot = 1 I/O group = 1 input image
word and 1 output image word = 16 input bits and 16 output bits.)
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Output Image Table
Word #
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Input Image Table
Word #
Controller memory
Rack x
0017 bits
0017 bits
Group 0
16-point I/O modules occupy 16 bits, an entire word, in
the image table.
Installing as a pair a 16-point input module and a
16-point output module efficiently uses the image table.
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Input
Terminals
Output
Terminals
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