GE IC697RCM711C | Redundancy Communications Module

This redundancy communications module creates a hot standby pair of Series 90-70 CPUs. It synchronizes the program execution and I/O data between two controllers. The unit enables automatic failover when the primary CPU stops operating.

Technical specifications

Parameter	Specification
Brand	GE Intelligent Platforms
Model	GE IC697RCM711C
Product Family	Series 90-70
Category	Redundancy Communications Module (RCM)
Communication Type	Fiber optic (dual redundant links)
Data Rate	200 Mbit/s
Fiber Type	Multimode (62.5/125 µm)
Maximum Cable Length	500 meters between modules
Connector Type	2 x ST (fiber optic)
Supported CPUs	IC697CPU731, IC697CPU771, IC697CPU782
Synchronization Method	Hot standby with bumpless transfer
Power Supply	5V DC from backplane
Current Consumption	400 mA from +5V backplane
Status Indicators	4 LEDs (PWR, SYNC, ACT, FLT)
Number of Components	1 PCB, 2 fiber transceivers, 8 ICs, 4 LEDs
Dimensions (L x W x H)	Approx. 14 cm x 11 cm x 3.5 cm
Weight	Approx. 0.45 kg
Energy Storage	None (no battery or capacitor)
Operating Temperature	0°C to 60°C

Detailed Technical Analysis

This redundancy module links two Series 90-70 CPUs in a hot standby configuration. It continuously synchronizes the program execution and I/O data. If the primary CPU fails, the secondary takes over without interruption. The GE IC697RCM711C completes this bumpless transfer in milliseconds.

Now let us examine its communication features. The module uses dual fiber optic links for complete path redundancy. Each link operates at 200 Mbit/s for fast data synchronization. You can place the two CPUs up to 500 meters apart. The GE IC697RCM711C includes two ST-type fiber optic connectors.

The module draws 400 milliamps from the 5V backplane supply. It contains no batteries or capacitors for energy storage. Four front-panel LEDs provide clear operational status information. The SYNC LED confirms both CPUs are synchronized properly. The ACT LED shows which controller currently owns the I/O bus.

Installation and Configuration Guidelines

You install this module in a Series 90-70 rack adjacent to the CPU. Use two separate fiber optic cables for the redundant links. Connect the TX port on one module to the RX port on the other. The GE IC697RCM711C automatically negotiates the link status at startup.

Configure the redundancy parameters through the programming software. Set one CPU as the primary and the other as the secondary. The GE IC697RCM711C requires identical firmware versions on both units. Always test the failover function before putting the system into production.

Practical Applications

Engineers use this module for critical processes that cannot tolerate downtime. For example, chemical plants and power generation facilities need this redundancy. The GE IC697RCM711C also suits water treatment and pharmaceutical manufacturing. Its dual fiber links prevent a single cable break from disabling the system.

Summary

To conclude, this redundancy module provides automatic failover for Series 90-70 systems. It operates at 200 Mbit/s over 500 meters of fiber optic cable. Choose GE IC697RCM711C for high-availability control in mission-critical applications.