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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Processor | 1 GHz Intel Celeron M |
| User Memory | Up to 20 MB battery-backed RAM; 20 MB non-volatile flash |
| Boolean Execution Speed | 0.047 ms per 1000 Boolean instructions (typical) |
| Discrete I/O | 32 Kbits (%I / %Q) |
| Analog I/O | Configurable up to 32 Kwords (%AI / %AQ) |
| Program Blocks | Up to 512 (max 128 KB each) |
| Floating Point | Yes |
| Serial Ports | 1 × RS-232 + 1 × RS-485 |
| Supported Protocols | Modbus RTU Slave, SNP, Serial I/O |
| Power Requirements | 1.2 A @ +5 VDC; 1.0 A @ +3.3 VDC |
| Battery Options | IC695ACC302 (recommended) or IC693ACC302 (IC698ACC701 not compatible) |
| Backplane | Universal Backplane only (dual PCI + high-speed serial bus) |
| Operating Temperature | 0 to 60 °C (32 to 140 °F) |
| Clock Accuracy | TOD: ≤2 s/day; Elapsed Time: 0.01 % max |
| Local Racks Supported | Up to 8 |
4. Product Introduction
The GE Fanuc / Emerson IC695CPU315-CD is a 1 GHz Celeron M CPU for the PACSystems RX3i platform. It provides 20 MB of battery-backed RAM and 20 MB of non-volatile flash memory, supports floating-point math, and executes Boolean logic at approximately 0.047 ms per 1000 instructions. Two embedded serial ports (RS-232 and RS-485) support Modbus RTU Slave, SNP, and Serial I/O protocols.
The dual backplane bus (high-speed PCI plus Series 90-30-style serial) allows use of both modern RX3i modules and legacy Series 90-30 I/O. The CD hardware revision specifically corrected an RS-485 (COM2) serial-port issue present in earlier revisions. The module installs only in an RX3i Universal Backplane and remains a common mid-range CPU for systems that need more memory than the CPU310 while remaining cost-effective compared with the higher-memory CPU320.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| CPU will not power / OK LED off | Backplane power or seating issue | ❌ Low | Measure +5 V and +3.3 V on Universal Backplane; reseat module | Verify power supply and slot contact |
| Program lost after power cycle | Dead or missing battery | ✅ High | Measure battery voltage; check BATT LED | Install fresh IC695ACC302 (or IC693ACC302) battery |
| RS-485 (COM2) communication failures | Pre-CD hardware issue or cable problem | ✅ High (pre-CD) / Medium | Confirm revision is CD or later; test with known-good cable | Use CD or later revision; verify RS-485 pinout and termination |
| Serial ports unresponsive | Protocol or baud mismatch | ✅ Medium | Test with terminal program at matching settings | Confirm Modbus/SNP/Serial I/O configuration |
| Module not recognized | Wrong backplane or firmware mismatch | ✅ High | Confirm Universal Backplane and compatible firmware | Use only IC695CHS Universal Backplane |
| Slow scan or watchdog | Excessive logic or I/O load | ✅ Medium | Monitor scan time in Machine Edition | Optimize logic; verify total rack current |
If the CPU continues to fault after these checks, photograph the faceplate LEDs, note the serial-cable configuration, and capture the diagnostic logs before contacting technical support.
IC695CPU315-CD
IC695CPU315-CD
6. Frequently Asked Questions (FAQ)
Q: What does the “-CD” suffix mean? A: It identifies the hardware revision. Revision CD corrected a known issue with the RS-485 (COM2) serial port that existed on earlier hardware. Functionally it is identical to later revisions for most applications.
Q: How much user memory is available? A: Up to 20 MB of battery-backed RAM and 20 MB of non-volatile flash. Discrete memory is fixed at 32 Kbits; analog memory is configurable up to 32 Kwords. Symbolic variables can use any remaining user memory.
Q: What battery should I use? A: The recommended battery is the RX3i Lithium Smart Battery IC695ACC302. The Series 90-30 pack IC693ACC302 is also compatible. The IC698ACC701 smart coin-cell pack is not compatible with the CPU315.
Q: Can this CPU use Series 90-30 modules? A: Yes. The dual backplane bus supports both high-speed RX3i PCI modules and legacy Series 90-30 serial-bus modules and expansion racks.
Q: What is the Boolean execution speed? A: Typical speed is 0.047 ms per 1000 Boolean instructions—noticeably faster than the earlier CPU310 (0.195 ms).
Q: Does it support floating-point math? A: Yes. Floating-point instructions are fully supported.
Q: Can this module be hot-swapped? A: RX3i supports controlled hot-swap under the proper conditions. Always follow Emerson’s documented procedures and remove field power when practical.
Q: Why is New Surplus priced lower than original list? A: These are unused original modules from OEM or distributor surplus inventory. Each unit is visually inspected, powered on a genuine RX3i Universal Backplane, and verified for basic LED and port response before shipment. Test documentation is available on request.
