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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. Status LEDs The LEDs on the front of the GBC indicate its operating status and should be on during normal operation. OK Shows the status of the GBC module. This LED turns on after power up diagnostics are completed. COM Shows the status of the Genius communications bus. This LED is on steadily when the bus is operating properly. It blinks for intermittent bus errors and is off for a failed bus. It is also off when no configuration has been received from the PLC CPU. Compatibility Specific equipment or software versions required for compatibility with the GBC module are listed below. Series 90-30 PLC CPU: The GBC module can be used with CPU models: IC693CPU311K, 321K, 331L or later, or any version of the IC693CPU313, 323, 340, 341, 350, 351, 352, 360, 363, and 364. The CPU firmware must be release 5.0 or later. Logicmaster 90-30 version 5.0 (IC641SWP301L, 304J, 306F, 307F), VersaPro, or Logic Developer-PLC software is required. Series Six PLC To exchange global data with a Genius Bus Controller, the Series Six Bus Controller must be catalog number IC660CBB902F/903F (firmware version 1.5), or later.