ABB SPDSO14Bailey Infi 90

I/O Expander Bus

The I/O expander bus is a high-speed, synchronous, parallel bus. It provides a path between controllers and I/O modules. The controller sends control functions to the ASI module, and the ASI module provides input data to the controller. The P2 card edge of the ASI module and controller connect to the bus.

The I/O expander bus is parallel signal lines located on the module mounting unit backplane. A 12-position dipshunt placed in a socket on the MMU backplane connects the bus between the controller and I/O modules. Cable assemblies can extend the bus to eight module mounting units. A controller and its I/O modules form a subsystem within a Harmony control unit (HCU). The I/O expander bus between control and I/O subsystems must be separated. Leaving a dipshunt socket empty or not connecting the module mounting units with cables separates them.

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