Key Technical Specifications
| Parameter | Specification |
|---|---|
| Order Code | IC695CRU320CA-EL |
| Functional Model | CRU320 (Redundancy Update/Synchronization Module) |
| Manufacturer | GE Fanuc / Emerson Automation |
| Processor | 1 GHz Intel Celeron-M |
| User Memory | 64 MB battery-backed RAM + 64 MB non-volatile flash |
| Failover Time | ≤ 1 logic scan (minimum 3.133 ms) |
| Redundancy Sync Links | Up to 2 × IC695RMX128 / IC695RMX228 |
| Max Sync Data Transfer | Up to 2 MB per synchronization cycle |
| Serial Ports | 2 × integrated (RS-232 and RS-485, software-configurable) |
| Ethernet | Via rack-based IC695ETM001 module |
| Backplane | RX3i PCI bus (supports IC695 and IC694 series modules) |
| Power Requirement | 3.3 VDC @ 1.0 A; 5 VDC @ 1.2 A |
| Operating Temperature | 0°C to +60°C |
| Slot Occupancy | 2 slots |
| Coating | Conformal coated (CA suffix) |
| Programming Software | Proficy Machine Edition |
Product Introduction
I have watched a perfectly healthy RX3i rack get blamed for a process upset when the real culprit was a desynchronized standby CPU. The GE IC695CRU320CA-EL is not a standalone controller. It is the redundancy engine that sits inside an RX3i rack and continuously mirrors program state, register values, and I/O image data from the primary CPU to the standby CPU. When the primary fails, the handoff happens in one scan. That is the difference between a minor alarm and a shutdown report.Engineers specify this module when the process cannot tolerate a controller reboot. The 1 GHz Celeron-M processor, 64 MB RAM, and 64 MB flash give it enough headroom for large logic programs, and the conformal coating (“CA”) makes it more tolerant of humidity and chemical exposure than the non-coated version. Do not confuse it with the IC695CPU320. The CPU320 runs logic. The CRU320 keeps two CPUs in lockstep. Get that wrong and you will order the wrong card twice.
Quality SOP & Tech Pitfalls
The Lab Report (SOP)
- Visual and counterfeit inspection: check housing, connectors, conformal coating condition, and label authenticity.
- Label verification: confirm IC695CRU320CA-EL matches the physical module.
- Multimeter check: verify backplane power pins, insulation, and short-circuit risk with a Fluke 115 or equivalent.
- Power-up test: install in an RX3i test rack and verify LED status, boot sequence, and basic communication.
- Redundancy interface check: verify RMX sync link connectors and serial port presence.
- Firmware/logging: record firmware version, serial number, and hardware revision.
- Final packing: anti-static bag, moisture barrier, and pre-shipment photo documentation.
The Engineer’s Warning (Pitfalls)
- Firmware mismatch kills redundancy pairing. A CRU320 that powers up cleanly can still refuse to synchronize if its firmware level does not match the primary CPU and the companion CRU320. I once saw a standby rack sit in “sync pending” for three hours because nobody checked the firmware revision after a spare was pulled from another unit.
- Do not swap RMX modules casually. The IC695RMX128/228 sync links carry the redundancy data. Wrong RMX type, bad fiber, or reversed ports will prevent synchronization even if both CPUs look healthy.
- Photograph all LED states and RMX cabling before removal. The primary/standby roles, sync link status, and fault LEDs tell you more than the HMI alarm log.
Installation & Configuration Guide
1. Pre-Installation ⚠️
- Follow site LOTO and DCS change-management procedures.
- Confirm whether the system is in primary/standby mode and which rack is active.
- Photograph all LEDs, RMX sync cables, serial connections, and slot positions.
- Back up the current control program and redundancy configuration in Proficy Machine Edition.
2. Removal
- Label RMX sync cables, serial cables, and any Ethernet module connections.
- Remove the failed CRU320 from its two-slot position without forcing the backplane connector.
- Inspect the RMX modules and backplane slots for bent pins or contamination.
3. Installation
- Verify the replacement IC695CRU320CA-EL firmware matches the existing system. This prevents most synchronization failures.
- Seat the module firmly into the correct two-slot position.
- Reconnect RMX sync links exactly as labeled.
- Confirm the companion CRU320 and RMX modules are healthy before forcing a switchover.
4. Power-On & Testing
- Apply rack power and verify LED boot sequence.
- Check redundancy synchronization status in Proficy Machine Edition.
- Confirm primary/standby roles, sync link health, and I/O image consistency.
- Perform a controlled manual switchover test before relying on automatic failover.
Compatible Replacement Models
- ✅ Drop-in Replacement: IC695CRU320CA-EL with matching firmware, RMX sync modules, and RX3i rack configuration. Best option for minimum downtime.
- ⚠️ Software/Firmware Compatible: Another IC695CRU320CA or IC695CRU320 variant. May require firmware alignment, redundancy re-pairing, and sync link verification. Allow 2–6 hours depending on system access.
- ❌ Not a Direct Substitute: IC695CPU320, IC695CPE310, IC695CPE330, or non-RX3i controllers. These are standalone CPUs, not redundancy synchronization modules, and cannot replace a CRU320 without full system redesign.
Frequently Asked Questions (FAQ)
Is the IC695CRU320CA-EL a standalone CPU?
No. It is a redundancy synchronization module. It works with an RX3i CPU such as the IC695CPU320 or CPE series. It does not execute user logic by itself.What does the “CA” suffix mean?
“CA” indicates conformal coating, which improves resistance to moisture, dust, and chemical exposure. The “EL” suffix relates to certification/environmental marking; verify the exact meaning against the OEM nameplate and datasheet.Can I use any IC695CRU320 as a replacement?
Not automatically. The firmware level, RMX sync module type, and RX3i software version must all be compatible. A mismatched CRU320 may power up but fail to synchronize.What causes a CRU320 to fail synchronization?
Most cases come from firmware mismatch, bad RMX sync cables, failed RMX modules, incorrect slot placement, or a desynchronized standby CPU image.Can I hot-swap this module?
Only if the redundancy system is healthy and the site procedure allows online replacement. If the standby side is already faulted, do not pull modules until the configuration is backed up and the switchover plan is confirmed.What RMX modules does it need?
It typically uses IC695RMX128 or IC695RMX228 redundancy memory exchange modules for the sync link. Confirm the exact type against your existing rack.Do you offer warranty?
Warranty terms depend on the specific unit and order confirmation. Typical spare-module coverage can be arranged, but it must be stated in the sales agreement.
