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Yes. As of firmware version 3.00-00-42 the 'A' or 'B' designation can be selected by using the LCD panel. The setting can be found by navigating to the PLC Operations - Hot Standby area.
***Using firmware versions previous to this the 'A' and 'B' designation was determined by the MAC address found on the lower front of the PLC. With both PLCs on-line, the lowest MAC address was 'A'.