Extenders of the zone control panel provide an increase in the address field of zone selection at the ROM panel. Each of the RPZU-30, RPZU-50 and RPZU-70 expanders increases the addressable field of the ROM console by 20 signalling zones, extending it to 30, 50 and 70 zones respectively.
RPZU-30 expands the signalling-switching field of the console from 11 to the 30th zone; RPZU-50 expands the signalling-switching field of the console from 31 to the 50th zone; RPZU-70 expands the signalling-switching field of the console from 51 to the 70th zone.
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