Karel DS200, Техническое справочное и монтажное руководство

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Racks constitute the basis of the mechanical structure of DS200. There are two types of rack
structure used in the DS200 systems, namely Main Rack and Auxiliary Rack.
The both types of racks have 14 general-purpose slots for the same EX200 interfaces;
however, the CPU200 and DS200 CPUKON cards are situated only in the main rack.
Therefore, there are special slots for these cards in the main rack, whereas those slots are
not present in auxiliary racks. As a result, backplanes of the main rack and auxiliary racks
are different (BPL200-MAIN and BPL200-AUX) and they cannot be used interchangeably.