Omron · CJ-series CJ2 CPU Unit
An Expansion Rack's starting word address exceeds CIO 0901, preventing the CPU from correctly addressing the I/O for the rack. The corresponding bit in A409.00 to A409.03 (Racks 0 to 3) will be turned ON, indicating the affected rack.
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Check the first word setting for the Rack indicated by A409.00 to A409.03.
Using a Programming Device (e.g., CX-Programmer), change the setting to a valid word address below CIO 0900.