Genius I/O Module GE IC660BSM021 | 24/48V Redundant Bus Unit

GE Fanuc IC660BSM021 Bus Switching Module – Product Description

Product Summary

The GE Fanuc IC660BSM021 is a compact bus switching module designed for Genius I/O networks that require robust communication redundancy. It links distributed I/O blocks to dual serial buses, allowing seamless transfers between primary and backup paths during network disturbances. Moreover, the module enhances system availability by enabling automatic or operator-initiated switching, which supports stable automation performance in demanding environments. Its rugged electronics and extended temperature rating also allow reliable operation in diverse industrial installations.

Technical Specifications

General Information

• Manufacturer: GE Fanuc (General Electric)

• Model Number: IC660BSM021

• Series: Genius I/O

• Product Type: Bus Switching Module

• Weight: 0.79 lbs

• Status: Discontinued by manufacturer

Electrical Characteristics

• Voltage rating: 24/48 VDC

• Alternate model: IC660BSM120 (115 VAC / 125 VDC)

• Bus switching: Automatic or manual

• Control sources: CPU command or handheld monitor

Function & Diagnostics

• Connects I/O modules to two serial communication buses

• Provides redundant communication paths

• LED indicators show active bus and fault conditions

• Switches during cable failure or manual selection

Compatibility

• Works with Genius I/O blocks

• Supports distributed topologies with multiple BSM units

Mechanical & Environmental

• dimensions: 60 × 120 × 30 mm

• Mounting: DIN-rail or panel installation

• Operating temperature: –40 °C to +70 °C

• Storage temperature: –40 °C to +85 °C

• Humidity: 5–95% non-condensing

• Rugged housing for industrial environments

FAQ

1. What is the main purpose of the IC660BSM021?
It ensures communication redundancy by connecting Genius I/O blocks to two serial buses.

2. Can the module switch buses automatically?
Yes, switching can occur automatically or through manual commands from the CPU or monitor.

3. Does the IC660BSM021 support low-voltage applications?
This model supports 24/48 VDC systems, which fits many industrial control panels.

4. Is it compatible with all Genius I/O blocks?
It works with the full Genius I/O family in distributed system configurations.

5. What happens when the primary bus fails?
The module switches to the backup bus, maintaining communication with the I/O network.