Number of Genius Bus Controllers
Up to eight Genius Bus Controllers or Enhanced Genius Communications Modules can be included
in a Series 90-30 PLC system that has release 5.0 or later CPU firmware. A GBC cannot be
installed in a system with a GCM.
The I/O devices on a bus may be Genius I/O blocks, or standard Series 90-70 I/O modules in one or
more remote drops. The total number of I/O circuits that can be served by one Genius bus depends
on the types of I/O devices that are used and the memory available in the CPU.
Many Genius I/O blocks have both inputs and outputs on the same block. Blocks configured in the
programming software as having both inputs and outputs occupy the identical number of references
in both %I and %Q memory, regardless of the block’s software configuration. Unused references
cannot be assigned to other inputs or outputs, and should not be used in the application program
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