Description
Product Introduction & Engineering Value
When a redundant PLC system changes from the primary controller to the standby controller, memory synchronization must occur without introducing inconsistent process data. The GE IC695RMX128 serves as the dedicated high-speed communication link that continuously mirrors controller memory between redundant PACSystems RX3i CPUs.
The module operates over a fiber-optic reflective memory network, allowing deterministic data exchange without increasing CPU processing overhead. Besides CPU redundancy, it can also function as a reflective memory node for high-speed controller-to-controller communication in distributed automation systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE Intelligent Platforms / Emerson |
| Model | IC695RMX128 |
| Product Family | PACSystems RX3i |
| Module Type | Redundancy Memory Xchange (RMX) |
| Memory Capacity | 128 MB SDRAM Reflective Memory |
| Communication Medium | Fiber Optic |
| Fiber Connector | LC Duplex |
| Network Speed | 2.12 Gbaud |
| Maximum Nodes | Up to 256 Reflective Memory Nodes* |
| Packet Size | Dynamic, 4–68 Bytes |
| Backplane Requirement | RX3i Universal PCI Backplane |
| Power Consumption | 580 mA @ 3.3 VDC, 220 mA @ 5 VDC |
| Hot Insertion | Supported (per system guidelines) |
| Typical Applications | CPU Redundancy, High-Speed Reflective Memory Networks |
*Reflective memory mode. Certain features are unavailable when the module is dedicated to CPU redundancy operation.
Field Application & The “Trench” Experience
A petrochemical complex operated two redundant PACSystems RX3i controllers to supervise compressor anti-surge control. During scheduled maintenance, technicians intentionally removed the primary controller to verify system redundancy.
Because the IC695RMX128 continuously synchronized application memory over the fiber-optic redundancy link, the standby CPU immediately assumed control without disturbing compressor operation. Operators observed only a redundancy status alarm while the process remained stable, eliminating what would otherwise have required a controlled shutdown.
Typical applications include:
- Steam turbine redundancy control
- Emergency shutdown support systems
- Continuous reactor process control
- High-speed data sharing between distributed PLC systems
- Utility control systems requiring deterministic controller synchronization
IC695RMX128
IC695RMX128
Transparency SOP: QA & Testing
Every New Surplus and professionally refurbished IC695RMX128 is subjected to documented quality verification before shipment.
- Mechanical inspection of housing, PCB, and optical connectors.
- Installation verification in an RX3i Universal Backplane.
- Fiber-optic transmitter and receiver performance testing.
- Reflective memory synchronization verification.
- Communication integrity testing under continuous data transfer.
- Firmware revision identification and validation.
- LED status and fault diagnostic verification.
- Burn-in operation followed by ESD-safe industrial packaging.
The Veteran’s Tech Trap Guide
⚠️ Install Only in the Main RX3i Rack
The IC695RMX128 requires an RX3i PCI Universal Backplane. It is not supported in IC694 expansion bases because those backplanes do not provide the required PCI architecture.
⚠️ Fiber Type Must Match
Single-mode and multi-mode optical modules cannot be connected directly. Verify the installed optical transceivers and fiber type before commissioning to avoid communication failures.
PRO TIP:
If a redundant system reports a broken redundancy link, inspect the optical cables and SFP/LC connections before replacing the RMX module. In field service, contaminated or damaged fiber connectors are far more common than RMX hardware failures.
⚠️ ESD Protection Is Critical
The optical transceiver is sensitive to electrostatic discharge. Emerson recommends using a grounded ESD strap during installation or maintenance to prevent damage to the communication interface.
Dynamic FAQ
Q1. What is the primary purpose of the IC695RMX128?
The provides high-speed memory synchronization between redundant PACSystems RX3i CPUs and can also function as a reflective memory node for deterministic controller-to-controller communication.
Q2. How much shared memory does the module provide?
The module contains 128 MB of reflective SDRAM, enabling deterministic memory sharing across the fiber-optic network.
Q3. Can the operate without a redundant CPU system?
Yes. When not configured as a redundancy link, it can operate as a standard reflective memory node compatible with the VMIC 5565 family, supporting high-speed deterministic data exchange between multiple controllers.
Q4. Is New Surplus inventory genuine?
Yes. New Surplus units are authentic OEM inventory that has never entered production service. Each module is inspected for part number verification, connector condition, and overall physical integrity before shipment.
Q5. How are refurbished modules tested?
Refurbished modules undergo functional power-up testing, optical communication verification, reflective memory synchronization testing, firmware validation, and extended operational burn-in before release.
Q6. Which CPUs are compatible with the ?
The module is designed for PACSystems RX3i controllers. In Hot Standby redundancy systems, it is commonly paired with redundant RX3i CPUs such as the IC695CRU320, and compatible CPU firmware versions are required for proper synchronization.
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