GE Fanuc IC660BLM506 Bus Terminal Components Connector 150 Ohms Four Connection Pins

GE Fanuc IC660BLM506 Bus Terminal Components Connector 150 Ohms Four Connection Pins

More Information:

The IC660BLM506 is a terminating resistor engineered for use with GE Fanuc Automation’s Genius I/O Block modules—now part of Emerson Automation’s product portfolio. Specifically, this accessory is mandatory when the final node in a Genius I/O network is a Genius I/O Block module.
Genius I/O Blocks are standalone, distributed I/O devices that integrate I/O module functionality and communication adapter capabilities. Available in various I/O density configurations and supporting specific I/O types, these blocks transmit I/O data via the Genius I/O Protocol across a daisy-chained Genius Bus topology.

Featuring a 150-Ohm resistance rating, the IC660BLM506 is designed for compatibility with prefabricated cables. Installation is simplified: the resistor slides directly onto the female cable end, establishing both a connection to the Genius I/O terminals and the impedance required to terminate the bus.

Installation guidelines vary based on network configuration:

• For redundant Genius I/O buses where the last node is a Bus Switching Module (BSM), the terminating resistor need only be installed across the BSM’s S1 and S2 terminals—individual resistors for each bus are unnecessary.
• If a Bus Controller or PCIM device serves as the final node, onboard terminating resistors should remain unset. Instead, the IC660BLM506 (or another resistor of appropriate value) should be connected across the Serial 1 and Serial 2 connectors on the Bus Controller. This approach enables board replacement without disconnecting or disrupting the bus, as termination is maintained by the external resistor rather than onboard components.

The IC660BLM506 also exists as a prefabricated 150-Ohm terminating plug, weighing 2 pounds. This plug is installed in the Serial 1 and Serial 2 terminals when bus termination occurs at a GE Fanuc Genius I/O Block. It is compatible with both conventional bus cables and those fitted with pre-molded connectors, and should always be connected to the cable’s female end.

Industrial PLC systems utilizing Genius I/O devices often combine control, analog, and communication wiring—particularly in confined spaces. The Genius serial bus relies on computer-grade twisted-pair data cables, structured in a daisy-chain configuration where Serial 1 and Serial 2 lines are tapped at intermediate points along the bus. Signal polarization demands consistent bus connections.

Cable shields are segmented, with each segment DC-grounded at one end (“Shield Out”) and terminated with a small capacitor at the other (“Shield In”). This segmentation breaks extended ground loop paths, while capacitor termination reduces high-frequency common-mode noise and prevents large-amplitude ground loop currents in the shield at low frequencies.

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