Product Core Brief

• Brand: GE Fanuc / Emerson Automation
• Model: IC695CRU320-CD (Conformal Coated) / IC695CRU320-EH (Extended Rugged Temperature)
• Series: PACSystems RX3i
• Core Function: High-performance hot standby redundant CPU for RX3i universal backplane. Implements bumpless automatic failover between active/standby racks via IC695RMX128 fiber reflective memory module, designed for zero-downtime critical processes (power plants, water treatment, continuous manufacturing).
• Type: Two consecutive slot rack-mounted redundant controller
• Condition: New Original (New Surplus)
• Status: ⚠️ Discontinued OEM production; limited surplus inventory
• Key Spec Highlights: 1 GHz Celeron M, 64 MB battery-backed RAM + 64 MB nonvolatile Flash, dual onboard serial ports, minimum switchover time 3.133ms, max one logic scan switchover; CD = PCB conformal coating; EH = extended wide operating temperature variant.

Key Technical Specifications

• Processor: Intel Celeron M @ 1 GHz
• Memory · 64 MB battery-backed user RAM · 64 MB non-volatile Flash memory
• Reference Table Capacity · Discrete: 32K %I / 32K %Q bits · Analog: 32K %AI / 32K %AQ words
• Program Structure: Up to 512 program blocks; max block size 128 KB
• Supported IEC Languages: Ladder Diagram, Structured Text, FBD, SFC, ANSI C blocks
• Built-in Serial Interfaces · COM1: RS‑232 (programming / SNP) · COM2: Isolated RS‑485 (Modbus RTU / Serial I/O)
• Redundancy Architecture · Hot Standby (HSB) dual-rack architecture · Mandatory pairing with IC695RMX128 fiber reflective memory module · Synchronization bandwidth up to 2 MB of mirrored runtime data · Automatic or manual controlled failover
• Switchover Performance: Minimum 3.133 ms; maximum one complete logic scan
• Backplane Power Consumption · 3.3 VDC: 1.0 A · 5 VDC: 1.2 A
• Environmental Variants · -CD: Standard temp 0 ~ +60°C, PCB conformal coating for humid/dusty corrosive environments · -EH: Extended rugged -25 ~ +60°C, suitable for unheated outdoor cabinets
• Backplane Compatibility: Dual bus architecture (PCI high-speed bus + legacy Series 90‑30 serial I/O bus)
• Ethernet: Requires external IC695ETM001 / ETM001ER module for TCP/IP, SRTP, Modbus TCP, EGD
• Battery: IC695ACC302 lithium smart battery for RAM data retention
• Hot Swap: Not supported, two-slot CPU requires rack power isolation for replacement
• Certifications: UL, CE, Class I Div.2 hazardous location qualified

Product Introduction

Power, municipal water and continuous-process facilities require control systems immune to single controller failure. is the dedicated hot standby redundant CPU for RX3i platform. Two independent control racks each deploy one CRU320 + one IC695RMX128 fiber sync module. The active CPU continuously mirrors all tag states, program data and I/O tables to the standby controller. Upon active rack fault, bumpless switchover occurs without process interruption. -CD conformal coated version protects circuitry against condensation, dust and corrosive airborne contaminants. -EH extended temperature variant supports cold climate outdoor installations. Occupies two consecutive RX3i slots and cannot be mixed with single-slot standard CPUs in redundancy schemes.

Key Selling Points & Differentiators

1. GE enables true bumpless hot standby redundancy; minimal failover latency protects critical continuous processes against unplanned trips.
2. Two industrial-grade variants available: CD conformal coating for humid / corrosive environments; EH extended low-temperature grade for remote cold-site outdoor enclosures.
3. Every unit undergoes full bench validation on RX3i test chassis; redundancy synchronization simulation, serial protocol operation, LED diagnostics verified prior to shipment. Signed test documentation available on formal request. Warranty runs 12 months post delivery.
4. Native support for ANSI C program blocks, suitable for complex algorithmic control beyond standard ladder logic.
5. Not compatible with RX7i, Series 90‑70 or Series 90‑30 racks; designed exclusively for RX3i universal backplane architecture.
6. Supports legacy Series 90‑30 I/O migration alongside modern RX3i high-speed I/O, lowering retrofit capital expenditure.

Quality Transparency SOP

• Incoming Verification: Serial traceability validation, anti-counterfeit visual inspection, serial D-Sub port and battery socket hardware cross-check.
• Live Bench Test: Dedicated RX3i test rack, power-on self-test, program download validation, redundant synchronization simulation, continuous 24-hour thermal soak cycling.
• Electrical Tests: 500 V megger insulation resistance testing, backplane power rail stability verification.
• Hardware Verification: Confirm LED array and serial communication circuits operate per datasheet; no unauthorized component rework performed.
• Final QC & Packaging: Anti-static shielding, shock-dampened transit carton, signed QC Pass label. Test images and logs available on request. No zero-failure performance guarantee.

Technical Risk Avoidance Section

Variant Mix-Up Risk Risk: Deploy standard non-coated CPU into corrosive environments or use standard temp model in sub-zero cabinets leading to intermittent faults. Prevention: Match suffix to site environment: CD = conformal coating; EH = wide temperature range. Do not arbitrarily interchange suffix variants without engineering review. Field note: Multiple remote pump stations experienced CPU communication instability after installing non-extended-temperature CPUs during winter low-temperature operation.

Mandatory RMX128 Requirement Risk Risk: Redundancy cannot function without paired IC695RMX128 reflective memory fiber module in each rack. Prevention: Verify complete bill of materials: 2 × CRU320 + 2 × IC695RMX128 + matched single-mode fiber.

Two-Slot Occupancy Risk Risk: Rack layout planned for single-slot CPU; CRU320 requires two consecutive free slots. Prevention: Reserve two contiguous slots during chassis layout design.

Battery Expiry Risk Risk: Aging lithium backup battery loses RAM data retention after extended power outage. Schedule battery replacement concurrent with CPU exchange.

ESD Damage Risk Risk: Unprotected handling damages memory and communication circuits without immediate visible fault indicators. Prevention: Use grounded wrist straps; keep module sealed inside anti-static packaging until rack insertion.

Critical Summary: Confirm cabinet temperature, atmospheric corrosion conditions and rack slot layout before procurement. This is a two-slot redundant-only CPU, cannot be substituted with IC695CPU320 non-redundant single-slot controller without full redundancy architecture redesign.

FAQ

1. Q: Can GE -CD / EH be installed into RX7i or Series 90‑70 racks? A: No. Built exclusively for RX3i universal backplanes; mechanical and electrical interfaces incompatible with other GE PLC families.
2. Q: What is the diffeen and -EH? A:

• : 0 ~ +60°C, PCB conformal coating for dusty, humid, mild corrosive environments
• : -25 ~ +60°C extended rugged temperature range for unheated outdoor cabinets Core control functionality, memory and redundancy features are identical.

1. Q: Can I mix CD and EH suffix CPUs in one redundant pair? A: Not recommended. Ambient operating specifications differ; Emerson official practice requires identical part number suffix for primary/standby pair.
2. Q: Does this module support hot-swap replacement while the RX3i rack remains energized? A: Hot swap is not supported. Isolate rack power supply before removing or installing the two-slot CPU.
3. Q: What lead times apply for available inventory? A: In-stock units ship within 1–3 business days. Backordered allocations require 5–7 week lead times subject to global surplus availability.
4. Q: What failure modes fall outside warranty coverage? A: The 12-month limited warranty covers manufacturing defects. Damage from expired backup battery, ESD, improper fiber wiring, operation outside published temperature range is excluded.
5. Q: What is the difference between and IC695CPU320? A: