GE Fanuc IC695RMX128 RX3i RMX128 Redundancy Memory Xchange Module

Product Overview

The GE IC695RMX128 is a Redundancy Memory Xchange (RMX) Module for the Emerson PACSystems RX3i programmable automation controller platform. It provides 128 MB of reflective SDRAM memory and connects via single-mode fiber-optic LC connectors at 2.12 Gbaud for high-speed data synchronization between redundant RX3i CPUs or across a reflective memory network of up to 256 nodes.

Key Specifications

• Model Number: IC695RMX128
• Series: PACSystems RX3i
• Product Type: Redundancy Memory Xchange (RMX) Module
• User Memory: 128 MB SDRAM (reflective memory)
• Communication: Single-mode fiber-optic (LC type connector)
• Transmission Speed: 2.12 Gbaud
• Nodes per Network: Up to 256
• Resolution: Four networks of 32 bits each
• Packet Size: Dynamic, controlled by RMC128/RMX228
• Input Power: 580 mA @ 3.3 VDC / 220 mA @ 5 VDC
• Compatibility: IC695CMX128 (partner module), RX3i CPUs
• Hot Insertion/Removal: Yes
• Network Error Detection: Yes
• Configurable Network: Yes
• Max Distance (Redundant): 300 meters
• Backplane Support: Universal backplane (PCI bus)
• Slots Required: 1 slot
• Weight: 0.22 kg (220g) per Amikong; 2.50 lbs (1.13 kg) per DoSupply
• Dimensions: 3.5 × 13.2 × 13.6 cm (per Amikong)

Core Features

• 128 MB reflective memory for real-time data synchronization
• 2.12 Gbaud fiber-optic transmission for ultra-fast updates
• Supports up to 256 nodes in reflective memory topology
• Automatic data mirroring between primary and secondary controllers
• Network error detection and diagnostic features
• Hot-swap capability for online maintenance
• Single-slot design for space-efficient installation

Applications

• Hot standby CPU redundancy systems
• High-availability process control
• Real-time data sharing across distributed controllers
• Mission-critical automation requiring failover protection

FAQ

Q: What is the difference between IC695RMX128 and IC695CMX128?
A: The IC695RMX128 is the Redundancy Memory Xchange module (for redundant CPU pairs). The IC695CMX128 is the Control Memory Xchange module. In a redundant configuration, the RMX128 reflects the contents of the CMX128.

Q: Can I use IC695RMX128 in a non-redundant system?
A: No. The IC695RMX128 is specifically designed for redundancy systems only. For general-purpose memory exchange, use IC695CMX128 instead.

Installation Guide

1. Install one IC695RMX128 in the primary RX3i rack.
2. Install a second IC695RMX128 in the secondary (backup) RX3i rack.
3. Connect two high-speed fiber-optic cables between the RMX pair to form a 2-node ring.
4. Configure RMX nodes via RX3i programming software (no jumpers/DIP switches).
5. Verify fiber-optic link integrity via module status LEDs.

Selection Tips

• Mandatory: Must be used in pairs (primary + secondary) for redundancy.
• Use single-mode fiber-optic cable with LC connectors.
• Maximum distance between redundant controllers: 300 meters.
• For non-redundant memory exchange, use IC695CMX128 instead.
• Ensure programming software supports RMX configuration.