Introduction to the IC695LRE001

GE Intelligent Platforms (now part of Emerson) designed the IC695LRE001 as a specialized serial bus transmitter for the PACSystems RX3i product line. This module serves as the critical bridge between the RX3i universal backplane and additional expansion or remote backplanes. In complex industrial automation setups, engineers often need to extend the physical reach of their I/O systems. The IC695LRE001 facilitates this by translating internal backplane signals into levels suitable for long-distance serial communication.

By utilizing this module, users can significantly increase their system’s I/O capacity without sacrificing performance. It occupies a single slot and integrates seamlessly into the RX3i architecture, maintaining the high standards of reliability expected in modern control environments.

Technical Specifications

The following table highlights the primary technical parameters of the IC695LRE001:

Core Functionality and Signal Translation

The primary role of the IC695LRE001 involves signal conversion. The RX3i universal backplane operates on specific logic levels that are not suitable for direct transmission over long cables. The IC695LRE001 translates these internal levels into differential signals. This conversion allows the system to communicate with remote backplanes located up to 700 feet away or expansion backplanes within a 50-foot range.

The module maintains an effective data rate of 500 kbps. This speed ensures that the CPU can refresh remote I/O data with minimal latency, which is essential for time-sensitive industrial processes. Because the module uses non-isolated differential communications, it provides a balance between high-speed data integrity and simplified circuit design.

Diagnostic LED Indicators

To simplify maintenance and troubleshooting, the IC695LRE001 features two distinct LED indicators located on the front panel:

1. Expansion OK: This LED illuminates when the universal backplane successfully applies 5V power to the module. It confirms that the transmitter hardware is powered and ready for operation.
2. Expansion Active: This indicator shows the real-time status of the expansion bus. When the module actively communicates with expansion or remote backplanes, this LED stays lit. If the communication link fails or the backplanes stop responding, the LED turns off, immediately alerting operators to a connectivity issue.

Installation and Placement Requirements

Successful deployment of the IC695LRE001 requires specific placement within the RX3i rack. Unlike standard I/O modules that fit into any universal slot, the IC695LRE001 must reside in the dedicated expansion connector. You will find this special connector on the far right side of the universal backplane.

The front of the module contains a high-density connector for the expansion cable. Users must ensure they use high-quality, shielded cables to reach the maximum distances of 50 feet for expansion or 700 feet for remote configurations. The module draws 132 mA from the 5V bus but requires 0 mA from the 3.3V bus, making it an efficient addition to the power budget of most RX3i systems.

Application Benefits

The IC695LRE001 offers several advantages for large-scale industrial applications:

• Scalability: It allows the system to grow by adding multiple backplanes to a single CPU controller.
• Distance Flexibility: The 700-foot remote capability enables the placement of I/O closer to the actual field sensors and actuators, reducing wiring costs.
• Reliability: As a genuine GE Fanuc / GE Intelligent Platforms component, it ensures full compatibility with the RX3i hardware and software ecosystem.