Description
Product Introduction & Engineering Value
In continuous-process industries, an unexpected PLC processor failure can result in hours of lost production. The GE IC695CRU320-BB was developed for PACSystems RX3i applications that require controller redundancy, allowing a standby processor to assume control automatically if the primary CPU becomes unavailable.
The module combines a 1 GHz processor, large application memory, dual serial communications, and redundant synchronization capability. It is commonly deployed in power generation, refinery, water treatment, and other facilities where controller availability is a design requirement rather than a convenience.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | GE Intelligent Platforms / Emerson |
| Model | IC695CRU320-BB |
| Product Family | PACSystems RX3i |
| CPU Type | Redundancy CPU |
| Processor | 1 GHz Intel® Celeron® M |
| User Memory | 64 MB Battery-Backed RAM |
| Flash Memory | 64 MB Non-Volatile Flash |
| Embedded Communications | RS-232 and RS-485 |
| Supported Protocols | SNP, Serial I/O, Modbus RTU |
| Floating Point Support | Yes |
| Backplane Support | RX3i PCI Bus and High-Speed Serial Bus |
| Program Blocks | Up to 512 |
| Maximum Block Size | 128 KB |
| Operating Temperature | 0°C to 60°C |
| Redundancy Support | Requires paired CRU320 CPU and IC695RMX128 Memory Xchange Module |
| Hardware/Firmware Revision | -BB / Firmware 6.00 |
IC695CRU320-BB
IC695CRU320-BB
IC695CRU320-BB
Field Application & The “Trench” Experience
A refinery utilities department operated redundant boiler feedwater PLCs because an unexpected shutdown would interrupt steam production across multiple process units. During routine maintenance, one CPU unexpectedly developed an internal hardware fault.
The standby IC695CRU320-BB immediately assumed control without interrupting the process. Operators observed only a redundancy alarm while pumps, valves, and burner management continued operating normally. The failed processor was replaced during the next scheduled maintenance window rather than during an emergency outage.
Typical applications include:
- Boiler feedwater control in combined-cycle power stations
- Refinery utility and flare management systems
- Continuous pulp digester process control
- Municipal water treatment plants requiring redundant PLC architecture
Transparency SOP: QA & Testing
Before shipment, every New Surplus or refurbished IC695CRU320-BB completes a documented inspection sequence.
- ✔ Visual inspection of enclosure, PCB, and backplane connectors
- ✔ CPU startup diagnostics in an RX3i test chassis
- ✔ SRAM and Flash memory integrity verification
- ✔ RS-232 and RS-485 communication testing
- ✔ Redundant synchronization test with a companion CRU320 CPU
- ✔ Firmware revision verification (BB hardware)
- ✔ Burn-in operation under simulated controller load
- ✔ Final ESD packaging and serial number documentation
The Veteran’s Tech Trap Guide
⚠️ A Redundant CPU Requires a Complete Redundant System
Installing a single IC695CRU320-BB does not provide Hot Standby protection. A complete redundancy architecture requires two CRU320 CPUs, compatible synchronization modules (IC695RMX128), and properly configured redundancy links.
⚠️ Don’t Ignore Hardware Revision Differences
The -BB revision corresponds to Firmware 6.00. Before replacing an existing controller, verify that both CPUs in the redundant pair are running compatible firmware revisions. Mixing revisions can prevent synchronization.
PRO TIP:
Always verify redundancy link health before replacing a CPU. Many “CPU faults” reported in the field are actually synchronization network issues involving cables, switches, or Memory Xchange modules.
⚠️ Battery Maintenance Is Still Important
Although the processor includes Flash memory, battery-backed RAM retains runtime information. A weak battery can complicate recovery after prolonged power outages.
Dynamic FAQ
Q1. What distinguishes the IC695CRU320-BB from a standard RX3i CPU?
The is designed specifically for Hot Standby redundancy. It operates with a second redundant CPU to provide automatic failover for applications requiring high availability.
Q2. What does the “-BB” suffix indicate?
The -BB suffix identifies a specific hardware revision associated with Firmware Version 6.00, which introduced several CPU enhancements over earlier revisions.
Q3. Does this CPU include Ethernet ports?
No. The includes RS-232 and RS-485 serial interfaces. Ethernet connectivity is provided through compatible RX3i communication modules.
Q4. Is New Surplus inventory genuine?
Yes. New Surplus modules are authentic OEM inventory that has never been installed in production equipment. Each unit is inspected for identification, physical condition, and connector integrity before shipment.
Q5. How are refurbished units tested?
Refurbished CPUs undergo complete functional verification, including CPU diagnostics, memory testing, serial communication checks, redundancy synchronization testing, firmware validation, and extended operational burn-in.
Q6. Can the be upgraded to newer firmware?
Yes. Emerson provides firmware updates for supported hardware revisions. Before performing an upgrade, verify compatibility with the installed PACSystems RX3i hardware, programming software, and redundancy configuration.
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