Discrete I/O Modules 29
Publication 1746-IN005A-US-P
Note:
Combination I/O modules (Catalog Numbers 1746-IO4, 1746-IO8, 1746-IO12 and
1746-IO12DC:
For the first several seconds of any powerup or when power is applied to a rack that is
not under processor control, the output LEDs of the combination IO modules in the rack
will be illuminated.
Racks are not under processor control if one of the following conditions exist:
Modular Hardware Style (only):
Processor is absent from the rack or the rack interconnect cable is not properly
connected.
Modular Hardware Style and Fixed Hardware Style:
The processor does not have the firmware PROM installed or the processor is not
functioning properly.
Allen-Bradley Spares
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