Addressing
Appendix A
A7
that performs the opposite (complementary) function; an input module
complements an output module and vice-versa.
You can use an 8-point module with 16-point module in a 2-slot group;
however, it too must perform the opposite function. In this arrangement,
eight bits in the I/O image table are unused.
Assigning I/O Rack Numbers
When you select 2-slot addressing, each pair of slots (one I/O group) is
assigned to the corresponding pair of words in the input and output image
tables. You assign one I/O rack number to eight I/O groups (Figure A.5).
Figure A.5
I/O
T
able and Corresponding Hardware for One Assigned Rack Number
For 2slot Addressing
0
0
1
2
3
4
5
6
7
Word #
Output Image T
able
When you select 2slot addressing
each pair of slots is assigned an
input image table word and an
output image table word.
1234567
IOIO IO IO IO IO IO IO
0
1
2
3
4
5
6
7
W
ord #
Input Image T
able
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