Product Core Brief

• Brand: GE Fanuc / Emerson Automation
• Model: IC695CPU320HU
• Series: PACSystems RX3i
• Core Function: High-performance single-slot standalone CPU for RX3i universal backplane; HU suffix = High Ambient / Extended high-temperature rugged variant. Executes real-time control logic for manufacturing, water treatment, power auxiliary and remote field automation. Can participate in hot standby redundancy architecture when paired with IC695RMX128 reflective memory fiber module.
• Type: Single-slot rack-mounted main controller
• Condition: New Original (New Surplus)
• Status: ⚠️ Discontinued OEM production; limited surplus inventory
• Key Spec Highlights: 1 GHz Intel Celeron M, 64 MB battery-backed RAM + 64 MB Flash memory, dual onboard serial ports, operating temperature -25°C ~ +70°C, single slot form factor, supports IEC standard languages + ANSI C blocks.

Key Technical Specifications

• Processor: Intel Celeron M @ 1 GHz
• Memory · 64 MB battery-backed SRAM (requires IC695ACC302 lithium battery) · 64 MB non-volatile Flash memory
• I/O Reference Capacity · Discrete: 32K %I / 32K %Q bits · Analog: 32K %AI / 32K %AQ words
• Supported Programming Languages: Ladder Diagram LD, Structured Text ST, FBD, SFC, ANSI C program blocks
• Built-in Serial Interfaces · COM1: RS‑232 D-Sub (programming, SNP slave) · COM2: Isolated RS‑485 (Modbus RTU Master / Slave, Serial I/O)
• Redundancy Support: Hot Standby capable with IC695RMX128 fiber reflective memory module (two separate racks)
• Ethernet: Requires external IC695ETM001 / ETM001ER module for SRTP, Modbus TCP, EGD
• Backplane Power Consumption · 3.3 VDC: 1.75 A · 5 VDC: 1.20 A
• Environmental Grade (HU variant): Operating -25 °C ~ +70 °C Standard IC695CPU320: 0 ~ +60°C
• Front Panel LEDs: CPU OK, RUN, Outputs Enabled, I/O Force, Battery Fault, System Fault, COM1 / COM2 Activity
• Backplane Compatibility: Dual bus architecture (PCI high-speed bus + legacy Series 90‑30 serial I/O bus)
• Hot Swap: Not supported; rack power should be isolated for CPU replacement
• Configuration Software: Proficy Machine Edition (PME)
• Certifications: UL, CE, Class I Division 2 hazardous location qualified

Product Introduction

Field installations with poorly ventilated enclosures, outdoor skids and tropical environments demand controllers tolerant of elevated cabinet temperatures. is the high ambient extended-temperature version of IC695CPU320 standalone RX3i CPU. It occupies only one RX3i rack slot, conserving chassis space for I/O and communications modules. It supports direct migration of legacy Series 90‑30 I/O, and can be configured for hot standby redundant control when matched with IC695RMX128 fiber synchronization hardware. Dual serial ports enable direct connection to Modbus field instruments, HMIs and legacy serial devices. All Ethernet communications rely on external IC695ETM001 series modules. Single-slot form factor allows direct drop-in spare replacement during planned maintenance windows.

Key Selling Points & Differentiators

1. GE offers extended high ambient temperature range (-25°C ~ +70°C), suitable for hot, unventilated control cabinets where standard IC695CPU320 cannot reliably operate.
2. Single-slot design saves rack space compared to two-slot IC695CRU320 redundant-only CPU.
3. Every unit undergoes full bench validation on an RX3i test chassis; program download, serial protocol testing, redundancy initialization simulation and LED diagnostics verified prior to shipment. Signed test documentation available on formal request. Warranty runs 12 months post delivery.
4. Native ANSI C language support enables complex mathematical and algorithmic control beyond standard IEC ladder logic.
5. Not compatible with RX7i, Series 90‑70 or Series 90‑30 main racks; designed exclusively for RX3i universal backplane architecture.
6. Backward compatible with Series 90‑30 I/O modules, lowering capital cost for legacy system retrofit projects.

Quality Transparency SOP

• Incoming Verification: Serial traceability validation, anti-counterfeit visual inspection, D-Sub serial port and battery socket hardware cross-check.
• Live Bench Test: Dedicated RX3i test rack, power-on self-test, full program download validation, Modbus serial master/slave test, 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

Suffix Variant Mismatch Risk Risk: Deploying standard IC695CPU320 (0~60°C) in high-temperature cabinets leads to thermal shutdown and intermittent faults. Prevention: Select HU variant for sites with sustained enclosure temperature above 55°C. Field note: Multiple tropical wastewater pumping stations experienced periodic CPU faults after technicians installed standard CPU320 inside non-air-conditioned field cabinets.

CPU320HU vs CRU320 Architecture Confusion Risk Risk: Attempting to use single-slot CPU320HU as drop-in replacement for two-slot IC695CRU320 redundant CPU without reviewing rack layout. Prevention: CRU320 is dedicated redundant two-slot CPU; CPU320HU is single-slot standalone CPU. Redundancy architecture layout must be revalidated if switching model types.

Backup Battery Expiry Risk Risk: Aging IC695ACC302 lithium battery loses RAM and RTC data retention after extended power outages. 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 maximum cabinet operating temperature and rack slot layout before procurement. This is a single-slot standalone CPU, cannot be directly substituted with two-slot IC695CRU320 without rack layout and redundancy scheme redesign. Operates exclusively on RX3i universal backplanes.