GE IC660BSM021 Genius I/O Bus Switching Module

This bus switching module connects redundant Genius bus cables to I/O blocks. It automatically selects the active communication path for system reliability. You will install this module between the bus controller and field devices.

Key Technical Specifications

The IC660BSM021 manages two independent Genius bus cables simultaneously. It switches between primary and secondary paths within 5 milliseconds. The module also provides optical isolation between the two bus lines.

Hardware Architecture and Switching Logic

The IC660BSM021 uses a dedicated microprocessor for bus monitoring. Optical couplers provide 1500V isolation between primary and secondary buses. Two fault alarm relays trigger external warnings upon switching events. The module also includes 220 µF of capacitance for brief power hold-up.

Interface and Connectivity

Two 9-pin female D-sub connectors attach to primary and secondary bus cables. Two 3-position terminal blocks accept 24V DC power from an external source. Four front LEDs indicate power status and active bus selection. The module also features a rotary switch for setting the device address.

Practical Installation Notes

Install this bus switching module between the controller and I/O blocks. The IC660BSM021 requires termination resistors at both bus ends. Always connect the primary bus to port A and secondary to port B. Verify the baud rate matches all devices on the same network.