Allen-Bradley PLC-2/30 - Page 322

Addressing
Appendix A
A14
Assigning I/O Rack Numbers
When you select 1/2-slot addressing, each slot corresponds to two I/O
groups. You still assign one rack number to eight groups; however, with
1/2-slot addressing this requires only four slots. Thus, in a single 16 slot
chassis, you now can have four I/O racks (Figure A.10).
Figure A.10
Assigning
I/O rack Numbers with 1/2slot Addressing
Í
Í
ÍÍ
I/O Group No.
03 47 03 47 03 47 03 47
I/O Groups 0, 1
Rack 1 Rack 2 Rack 3 Rack 4
I/O Groups 2, 3
I/O Groups 6, 7
I/O Groups 4, 5
1771A4B I/O Chassis using 1/2slot addressing
Assigned Rack Numbers
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