Description
Product Introduction
The GE Emerson PACSystems RX3i IC695CRU320-CD is a high-availability, bump-less redundancy CPU engineered for mission-critical automation applications where unexpected downtime translates directly to severe financial or safety losses. Built around a 1 GHz Intel Celeron processor with a massive 64 MB user memory capacity, this controller handles high instruction counts, multi-loop PID control, and extensive data logging without compromising scan speed.
Occupying a double-slot footprint on an RX3i Universal Backplane (IC695CHS012 or IC695CHS016), the IC695CRU320-CD leverages a PCI backplane bus architecture. The “-CD” hardware revision reflects upgraded internal hardware components for improved thermal and electrical robustness. Operating in a dual-rack primary/secondary configuration via fiber optic sync modules, it maintains real-time register mirror synchronization for instant failover if the primary unit encounters a fault.
Key Technical Specifications
| Parameter | Value |
| Processor Speed | 1 GHz Intel Celeron Microprocessor |
| User Memory | 64 Megabytes (Battery-backed RAM / Non-volatile Flash) |
| Hardware Revision | -CD |
| Redundancy Type | High-Availability Hot-Standby (Bump-less failover) |
| Physical Width | Dual Slot (Occupies 2 slots on RX3i Universal Backplane) |
| Backplane Interface | High-speed PCI Bus (Requires RX3i Universal Backplane) |
| Onboard Serial Ports | 2 Ports: 1 x RS-232 (Port 1), 1 x RS-485 (Port 2) |
| Supported Protocols | Modbus RTU Master/Slave, SNP Slave, Serial I/O Read/Write |
| Discrete I/O Capacity | Up to 32,000 Inputs and 32,000 Outputs |
| Analog I/O Capacity | Up to 32,000 Words Analog Inputs and Outputs |
Application Scenarios & The “Trench” Experience
When an off-grid turbine or chemical processing rack loses its main controller, standard single-CPU systems trip out entirely. Restarting a continuous process line can take days, requiring manual line purges and thousands in lost raw materials.
- Oil & Gas Processing – Managing main flare headers and emergency shutdown (ESD) loops where process interruptions trigger regulatory fines.
- Continuous Chemical Synthesis – Executing high-density batch recipes where a processor trip ruins multi-stage chemical reactions.
- Turbine Power Generation – Operating dual-redundant gas/steam turbine control systems requiring sub-cycle sync times.
Field Case Study: A chemical refinery experienced a sudden internal power supply fault on the primary CPU chassis during a full batch run. Because the system ran dual IC695CRU320-CD processors linked via fiber optic sync cards, the secondary standby unit took control in under 3 milliseconds. The batch completed without interruption, and field technicians replaced the failed power supply on the dark rack while the process stayed live.
IC695CRU320-CD
IC695CRU320-CD
Transparency SOP: Quality Assurance & Testing
High-availability redundant controllers leave zero margin for error. Every IC695CRU320-CD unit undergoes rigorous dual-rack bench validation before shipment.
- Inbound Mechanical Inspection: Verify housing alignment, PCI edge connector gold fingers, double-slot retaining clips, and confirm original OEM serial tags and “-CD” revision marks.
- Dual-Rack POST Verification: Slot the CRU320-CD into an RX3i Universal Baseplate (IC695CHS012) in a paired redundancy configuration. Confirm clean boot-up and LED diagnostic status (OK, RUN, FAULT, STAT).
- PME Software Diagnostics: Connect via PAC Machine Edition (PME), execute flash memory sector tests, clear diagnostic error tables, and log firmware revisions.
- Active Redundancy Failover Test: Link the CPU with an IC695RMX128 fiber sync module. Load a 64MB stress project and pull primary rack power to verify seamless, bump-less transfer of control to the secondary rack under load.
- Anti-Static ESD Packaging: Cap PCI edge connectors with protective covers, seal in static-shielding bags with fresh desiccant, and box in custom dense foam packaging.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ Strict Revision & Firmware Matching Required! In an RX3i redundant CPU pair, BOTH the primary and secondary racks must use matching hardware revision levels and firmware versions. Trying to pair an older IC695CRU320-AB running older firmware with a new IC695CRU320-CD will cause the redundancy handshake to fail during synchronization.
❗ Note the Double-Slot Physical Footprint! The IC695CRU320-CD takes up two physical slots on an RX3i Universal Baseplate (IC695CHS012 or IC695CHS016). Ensure your enclosure layout allows for double-width positioning next to the power supply.
⚠️ Keep Fresh RAM Batteries Installed! High-availability bump-less synchronization requires memory registers to stay active even when a rack is dark. If a dark standby rack’s lithium battery (IC698ACC701 / Energy Pack) dies, it will lose register state data and fail to perform a bump-less takeover if the primary rack drops out.
Frequently Asked Questions (FAQ)
Q: What is the significance of the “-CD” suffix on the IC695CRU320?
A: The “-CD” suffix indicates a specific hardware revision level. Revision “CD” updates internal components over earlier revisions (like -AB or -BC) for enhanced hardware reliability, while maintaining complete backward compatibility in non-redundant setups.
Q: Can I replace an older IC695CRU320-BC with this -CD revision?
A: Yes, if used as a standalone CPU. However, if used in a redundant dual-rack configuration, you must update both the primary and secondary CPUs to match hardware revisions and firmware versions to guarantee synchronization.
Q: Does the have onboard Ethernet ports?
A: No. The provides RS-232 and RS-485 serial interfaces. To add Modbus TCP, PROFINET, or SRTP Ethernet communications, install an expansion module such as the IC695ETM001 or IC695PNC001.
Q: Can I run this unit as a standard single CPU without redundancy?
A: Yes. The can operate as a standalone CPU in a standard RX3i system, giving you access to its full 64 MB user memory.
Q: What warranty is provided with this module?
A: Every new surplus and fully bench-tested pre-owned module shipped from our warehouse comes backed by a full 12-month replacement warranty.
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