Description
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3. Product Introduction (Anti-Template)
The RX3i platform remains widely installed for discrete manufacturing, process control, and material handling. The IC695CPU315-BB is a dual-slot CPU module built around a 1 GHz Celeron M processor with 20 MB of battery-backed user memory and matching non-volatile flash storage.
It supports both the high-speed PCI backplane and the serial backplane, allowing continued use of existing Series 90-30 I/O in mixed systems. Plants standardized on RX3i keep this CPU available because controller failure takes the entire rack offline until a compatible replacement is installed and the application is restored.
IC695CPU315-BB
IC695CPU315-BB
IC695CPU315-BB
4. Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | IC695CPU315-BB |
| Processor | 1 GHz Celeron M |
| User Memory | 20 MB battery-backed RAM |
| Non-Volatile Memory | 20 MB Flash |
| Boolean Execution Speed | Approx. 0.047 ms per 1000 Boolean instructions |
| Discrete I/O Capacity | 32K bits |
| Analog I/O Capacity | 32K words |
| Program Blocks | Up to 512 (max 128 KB each) |
| Serial Ports | 2 (RS-232 and RS-485) |
| Serial Protocols | SNP, Serial I/O, Modbus RTU Slave/Master |
| Backplane Support | Dual (RX3i PCI + high-speed serial) |
| Slots Occupied | 2 |
| Power Requirements | +3.3 VDC ≈ 1.0 A; +5 VDC ≈ 1.2 A (typical) |
| Operating Temperature | 0°C to 60°C |
5. Field Application & Technical Pitfalls (The Engineer’s Guide)
This CPU is used as the main controller in RX3i systems for real-time logic, motion, and process applications. It supports programming in Ladder Diagram, Structured Text, Function Block Diagram, and C, and maintains compatibility with both modern RX3i I/O and legacy Series 90-30 modules.
Three pitfalls appear during replacement:
Battery condition – a depleted or incorrect battery pack can cause loss of user memory on power cycle. Use only approved packs (IC695ACC302 preferred).
Firmware compatibility – the replacement CPU must run firmware compatible with the installed application and any specialty modules (for example PROFINET controllers).
Slot and power budget – the module occupies two slots and draws significant backplane current; verify available power supply capacity before installation.
One plant replaced a CPU315 and experienced intermittent memory faults after power cycles. The new module was healthy; the installed battery pack was an older non-smart type that had reached end of life. Installing the recommended smart battery resolved the issue.
6. Quality Control (QC) SOP & Transparency
- Inbound Verification – OEM labeling, part number (including -BB revision), and date codes are photographed and checked against the packing list; any signs of prior field use are noted.
- Live Rig Testing – module is installed in a known-good RX3i rack, powered, and verified for successful power-up diagnostics and status LED behavior.
- Parameter Testing – basic communications (serial ports) and memory integrity are checked where test equipment is available.
- Final QA & Packaging – unit is sealed in an anti-static bag with desiccant, fitted with a QC-passed label showing test date and technician ID, then double-boxed for shipment.
7. Frequently Asked Questions (FAQ)
What is the IC695CPU315-BB?
It is a 1 GHz Celeron M CPU module for the GE Fanuc / Emerson PACSystems RX3i platform with 20 MB of user memory.
How much user memory does it have?
20 MB of battery-backed RAM plus 20 MB of non-volatile flash.
Does it support Series 90-30 I/O?
Yes. The dual backplane design allows use of both RX3i PCI modules and compatible Series 90-30 serial-bus modules.
What serial protocols are supported?
SNP, Serial I/O, and Modbus RTU (Slave and Master).
What warranty comes with a new-surplus unit?
Twelve months from shipment against defects in materials and workmanship when installed within the published ratings.
How do I confirm the module is healthy after installation?
Install the CPU, apply power, verify status LEDs indicate a healthy state, confirm the programmer can connect, download or verify the application, and check that I/O scanning and communications function without faults.
