Starting Your Processor
Chapter 5
5-7
Figure 5.5
Illustration of 2Slot Addressing with 8point Input and Output Modules
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17 16 15 14 12 10 07 06 05 03 02 01 00
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11868
input bits used
Output image table word
corresponding to the I/O group
Input image table word
corresponding to the I/O group
output bits used
input
terminals
2slot
I/O group
output
terminals
Using 16-Point I/O Modules
High-density (16-point) I/O modules provide 16 input terminals or 16
output terminals. 16-point I/O modules use a full word in the input or
output image table.
Important: 16-point modules may only be used in a complimentary
fashion in 2-slot addressing mode. Two 16-point modules, one input and
one output, can be used in a 2-slot I/O group (Figure 5.6).
