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Phone: +86 16626708626Description
Key Technical Specifications
- CPU Type: 2003 CPU with expansion
- SRAM: 750 kB
- FlashPROM: 1.5 MB
- Supply Voltage: 24 VDC
- Power Consumption: 12.15 W
- Serial Interface: 1x RS232
- Network Interface: 1x CAN (electrically isolated, network-capable)
- Module Slots: 4 slots for screw-in I/O modules
- Expansion: 1x PCMCIA slot
- Hazardous Location Rating: cULus HazLoc, Class I Division 2, Groups A/B/C/D
- Certifications: CE, UKCA
Product Introduction
The B&R 7CP476-010.9 is a CPU module from B&R’s 2003 automation platform, built around 750 kB of SRAM and 1.5 MB of FlashPROM, running on a 24 VDC supply at 12.15 W. It carries an isolated CAN interface alongside RS232, four slots for screw-in I/O modules, and a PCMCIA expansion slot for additional memory or interface cards.
The Class I Division 2 HazLoc rating is what keeps this specific CPU in demand for petrochemical and process plants running legacy 2003-series racks in classified areas — swapping to a modern controller means requalifying the whole panel for the hazardous location, while a matched replacement CPU doesn’t. It’s a maintenance part for an installed base, not a platform for new designs.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| CPU won’t boot, no status LEDs | Power supply failure or blown fuse on the rack | ❌ Low | Measure 24 VDC at the CPU’s power terminals | Check rack power supply before condemning the CPU |
| CAN network dropouts | Bus termination fault, cable damage, address conflict | ❌ Low | Check CAN bus termination resistors and node addressing | Usually a network wiring issue, not the CPU module |
| Program memory corruption or won’t retain program | FlashPROM wear or battery failure (backup battery for SRAM retention) | ✅ High | Check backup battery voltage (3 V lithium button cell) | Replace battery first — often resolves apparent memory faults |
| PCMCIA card not recognized | Card seating issue or incompatible card type | ❌ Low | Reseat card, confirm card type matches supported list (FlashPROM/SRAM PC cards) | Usually a seating or compatibility issue, not a CPU fault |
| RS232 programming connection fails | Cable fault, wrong cable pinout, driver/software mismatch | ❌ Low | Test with known-good cable and confirm software connection settings | Rule out cable and software before replacing hardware |
| Intermittent I/O faults across all module slots | CPU backplane connector fault | ✅ High | Inspect backplane pins for corrosion or bent contacts | If backplane is clean and I/O faults persist, CPU replacement is likely needed |
If you’re not sure whether it’s the CPU or the backup battery, check the battery first — it’s the single most common cause of what looks like a dead CPU on this platform.
7CP476-010.9
7CP476-010.9
Frequently Asked Questions (FAQ)
Is the B&R 2003 platform still in production?
No. B&R’s 2003 series has been superseded by newer platforms for a long time now. What we stock is pulled and tested surplus or new-old-stock units, not current production. We’ll tell you exactly which one you’re getting before you buy.
Will my existing program and configuration transfer directly to a replacement CPU?
The program itself lives on the FlashPROM or a PCMCIA memory card, not baked into the CPU hardware. If you’ve got a backup card or a saved project file, reloading it onto the replacement CPU is straightforward. If your only copy of the program is on the failed unit’s onboard memory, that’s a different conversation — let us know before you order and we can talk through recovery options.
Do I need to match the exact backup battery type?
Yes — this platform uses a 3 V lithium button cell (950 mAh) for SRAM retention. Using an unspecified substitute risks losing your program on power loss. Order genuine or exact-equivalent cells, not a generic “close enough” battery.
Is this suitable for my Class I Division 2 hazardous area installation?
The 7CP476-010.9 does carry cULus HazLoc certification for Class I, Division 2, Groups A, B, C, D. Confirm your site’s exact area classification and gas group requirements against this rating before installing — Division 2 is not the same as Division 1, and getting that distinction wrong is a code compliance issue, not just a technical one.
Why buy surplus instead of trying to find new stock from B&R?
Because there is no new stock — B&R doesn’t manufacture this CPU anymore. A tested surplus unit from a working system is a more reliable bet than gambling on an untested pull sitting in someone’s parts bin, which is really the alternative you’re facing on a platform this old.
What testing do you run before shipping a used CPU like this?
Visual inspection for corrosion or damage, functional power-on test confirming boot sequence and status LEDs, CAN and RS232 communication verification, and a check of the PCMCIA slot function. Ask and we’ll send the test report and photos from the specific unit.
