I. Basic Material Information
Brand: Emerson (formerly GE Fanuc)
Series: PACSystems RX3i PLC
Product Type: 128MB Reflective Memory Redundant Synchronous Module
Official Manual: GFK-2300 (English original version, no printed manual provided at factory, only electronic PDF available)
Installation Method: Single slot on RX3i rack, supports hot-swappable power-on
Protection Grade: IP20 (installed in control cabinet)
Core Hardware Parameters
Storage Specifications: 128MB with parity check SDRAM reflective memory
Communication Interface: LC single-mode optical fiber interface, transmission rate 2.12 Gbaud
Backplane Power Consumption: 3.3V/580mA, 5V/220mA Environmental parameters
Operating temperature: 0℃ to +55℃
Storage temperature: -40℃ to +85℃, humidity 5% to 95% without condensation
Networking capability: The reflective memory ring network of RX3i can support up to 256 PLC nodes for high-speed real-time data sharing
Two core application scenarios
Scenario 1: RX3i dual CPU redundant hot standby (most commonly used)
The main station IC695CMX128 and the slave station IC695RMX128 need to be used in pairs. They are connected through dual fiber cross-networking:
Millisecond-level synchronous main and standby CPU programs, I/O status, process data
When the main CPU fails, the standby CPU seamlessly switches without interruption, ensuring uninterrupted system operation
Fiber link redundancy. A single optical fiber break does not affect data synchronization
Scenario 2: Multi-PLC distributed reflective memory ring network
Multiple RX3i controllers equipped with RMX128 form an optical fiber ring network, achieving deterministic high-speed data interaction for multiple nodes, commonly used in power plants, rail transit, and large-scale assembly line multi-station collaborative control.
Panel indicator light definitions (quick fault troubleshooting)
Local side (LOCAL)
READY: Always on = Module hardware self-check is normal; Blinking / Off = Hardware failure, unrecognized backplane
ACTIVE: Always on = Current CPU is the master station and is synchronizing data; Blinking = Data transmission and reception in progress
Remote side (REMOTE)
READY: Hardware readiness of the opposite RMX/CMX module
ACTIVE: Normal optical fiber links and data synchronization between both ends
Fiber link status
LINK OK: Optical fiber physical link is connected; Off = Optical fiber break, connector dirtiness, transmission failure
FAULT: Always on = Parity check error, node address conflict, fiber ring network topology error
Differences of the same series models Table
Model Usage Usage Method
IC695CMX128 Redundant Master Module One CMX128 must be designated as the master in the redundant system
IC695RMX128 Redundant Slave / Ring Network Node Module Matched with CMX128 for redundant pair, or multi-unit networking
IC695RMX228 256MB Large Capacity Version For scenarios with large data flow synchronization
Installation Configuration and Replacement Key Points
Hardware Requirements: The redundant system must be paired with one master and one slave (CMX128 + RMX128), and two RMXs cannot be directly used for CPU redundancy
Fiber Connection: Cross-connect the two fiber paths (Port A connects to the opposite Port B, and Port B connects to the opposite Port A), forming a closed redundant link
Parameter Configuration: There is no hardware dip switch. All settings for reflecting memory node addresses and memory offsets are made in the Proficy Machine Edition software
Replacement Steps
Confirm that the firmware version of the module is compatible with the original equipment
After replacement, check the fiber link, observe that READY and ACTIVE are constantly on
Download the hardware configuration, test the master-slave switching and data synchronization functions
It is necessary to use single-mode LC optical fibers. Multi-mode optical fibers cannot communicate normally
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