GE IC660BLM506 Bus Terminator 150 Ohm for Genius I/O Block

Technical Specifications Breakdown

Key parameters for the IC660BLM506 are listed below for quick reference:

Application in Simplex and Redundant Bus Topologies

Simplex Bus Termination

In a simplex Genius I/O Bus, the IC660BLM506 is installed across the S1 and S2 terminals of the last Genius I/O Block. This ensures the bus is properly terminated without relying on onboard resistors, allowing module replacement without disconnecting the bus cable. Use a flat screwdriver to secure the plug onto the female cable end.

Redundant Bus Configuration

For redundant buses where the last node is a Bus Switching Module (BSM), install the terminating resistor only across the S1 and S2 terminals of the BSM. Do not add separate resistors on each bus. This approach maintains consistent impedance and simplifies maintenance.

Bus Controller or PCIM as Last Node

If a Bus Controller or PCIM is the final device, disable onboard terminating resistors and install this 150 Ohm plug across the Serial 1 and Serial 2 connectors. This method keeps the bus terminated even when boards are swapped, reducing downtime.

Installation Guidance for Engineers

1. Identify the last node on the Genius I/O Bus (simplex or redundant).
2. Use a flat screwdriver to slide the IC660BLM506 onto the female cable end of the prefabricated cable (e.g., IC660BLC001 or IC660BLC003).
3. Connect the plug across the Serial 1 and Serial 2 terminals of the Genius I/O Block, BSM, or Bus Controller.
4. Verify polarity — the Genius serial bus uses polarized twisted-pair cables; ensure consistent wiring.
5. For redundant buses, confirm that only one terminating resistor is installed at the BSM, not on each individual bus.

Maintenance and Reliability Considerations

Since the IC660BLM506 is a passive resistor with no moving parts, it requires minimal maintenance. However, inspect the connection periodically for corrosion or loose fit, especially in high-vibration or humid environments. The black housing provides basic environmental protection. Because this product is discontinued, verify availability and lifecycle status with AutoDCSTech before ordering.

Preventing Signal Reflection in Genius I/O Networks

In distributed control systems, improper bus termination leads to data errors and intermittent faults. The GE IC660BLM506 provides a precise 150 Ohm resistive load to eliminate signal reflections on the Genius I/O Bus. Designed for the Genius I/O Block series (formerly GE Fanuc, now Emerson Automation), this terminating plug ensures reliable communication in simplex and redundant topologies. Without correct termination, the last node can cause packet loss or bus instability, especially in long cable runs or high-noise industrial environments.

Compatibility and Integration

This terminating plug works with conventional bus cables and pre-molded connector cables. Compatible prefabricated cables include IC660BLC001 and IC660BLC003. The four connection pins ensure a secure fit on the female cable end.

Purchasing Guidance

When selecting a bus terminator for your Genius I/O network, ensure the resistance value matches the bus impedance — 150 Ohms for standard Genius I/O systems. The IC660BLM506 is a discontinued product, so contact AutoDCSTech to confirm current stock and lead times. AutoDCSTech offers genuine industrial automation parts with fast shipping.