Rockwell Automation T3122 ICS Regent Processor Modules - Manual (Page 13)

Processor Modules (T3110, 11, 12, 20, 21, and 22)
P D - 6 0 0 0 M a r - 0 6
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this ribbon cable; instead, simply lift the main processor board
to expose and access the I/O processor board.
Figure 6. Processor Circuit Board Assembly.
Replacing EPROMs
The three EPROMs in each module are labeled U42 and U43
(main processor) and U19 (I/O processor). Figure 7 shows the
locations of the EPROMs on each printed circuit board.