GE Fanuc IC660BLM506 Terminating Plug Genis I/O Block 150 Ohms Four Connection Pins

GE Fanuc IC660BLM506 Terminating Plug Genis I/O Block 150 Ohms Four Connection Pins

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The IC660BLM506 is a terminating resistor designed for use with the Genius I/O Block module. Specifically classified as an accessory component, it is required exclusively when the final node of a Genius I/O network consists of a Genius I/O Block module. Genius I/O Blocks are standalone, distributed I/O devices that dual-function as both I/O modules and communication adapters. Each block comes with varying I/O densities and supports specific I/O types, all of which can exchange I/O data via the Genius I/O Protocol over the Genius Bus’s daisy-chain topology. This I/O platform was originally manufactured by GE Fanuc Automation and is now under the umbrella of Emerson Automation.
Featuring a resistance value of 150 Ohms, the IC660BLM506 is compatible with prefabricated cables. Installation is straightforward: simply slide the resistor onto the female cable end. This action establishes a connection to the Genius I/O terminals while providing the necessary impedance to terminate the bus. For redundant Genius I/O bus implementations where the last node is a Bus Switching Module (BSM), the terminating resistor should only be installed across the BSM’s S1 and S2 terminals—individual resistors for each bus are unnecessary. If the final node of the Genius I/O Bus is a Bus Controller or PCIM device, do not activate the onboard terminating resistors. Instead, install a resistor of appropriate value (such as the IC660BLM506) across the Serial 1 and Serial 2 connectors on the Bus Controller. A key advantage of this approach is that it allows board replacement without disconnecting or disrupting the bus connection, as termination is maintained by the separately installed resistor rather than the onboard ones.
The IC660BLM506 is a prefabricated 150-Ohm terminating plug. It is installed in the Serial 1 and Serial 2 terminals when a bus is terminated at a GE Fanuc Genius I/O Block, weighing 2 pounds. This plug is suitable for use with both conventional bus cables and those equipped with pre-molded connectors, and should be connected to the female end of the cable.
Industrial installation systems typically incorporate four types of wiring. PLC systems utilizing Genius I/O devices often combine control wiring, analog wiring, and communication wiring—especially in confined spaces. The Genius serial bus employs computer-grade twisted-pair data cables, constructed via daisy-chaining with Serial 1 and Serial 2 lines tapped at intermediate points along the bus. Consistent bus connections are critical due to signal polarization. The cable shield is divided into segments, each of which is DC-grounded at one end (Shield Out) and terminated with a small capacitor at the other (Shield In). This segmentation is intended to break up extended ground loop paths, while capacitor termination helps reduce common-mode noise from high-frequency interference and prevents high-amplitude ground loop currents in the cable shield at low frequencies.

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