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Phone: +86 16626708626Description
Key Technical Specifications
- Part Number: H4893P4673
- Manufacturer: HARLAND SIMON
- Product Type: Central processing module
- Series: Intella 400
- Application: Legacy PLC and industrial control systems
- Status: Discontinued by manufacturer
- Availability: Limited stock
- Condition: New Surplus
- Replacement Note: Confirm exact issue level and rack compatibility before installation
- Procurement Note: Commonly sourced as an obsolete spare
- Compatibility Note: Verify firmware and configuration match the original unit
Product Introduction
HARLAND SIMON H4893P4673 is a central processing module for legacy industrial control systems. It is typically used as a replacement CPU in older PLC and automation racks where the exact model and revision matter.
This part is sourced as new surplus and is usually bought to keep installed equipment running without changing the control platform. Verify the issue level, firmware, and backplane compatibility before ordering, since older HARLAND SIMON CPUs can vary by revision.
- H4893P4673
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LEDs on power-up | Rack power loss, blown fuse, or backplane failure | ❌ Low | Measure supply voltage at the rack terminals with a multimeter | Check the PSU and rack before replacing the CPU |
| CPU fault or system halt | Processor failure, firmware mismatch, or corrupted configuration | ✅ High | Read the diagnostic buffer and compare it with the original CPU | Verify the exact issue level and firmware before swap |
| Intermittent resets | Power instability or poor rack contact | ✅ Medium | Monitor supply voltage under load and inspect the edge connector | Clean contacts and confirm stable rack power |
| Communication timeout | Wrong CPU revision or host mismatch | ✅ High | Compare the installed module against the original part number and issue code | Do not install until compatibility is confirmed |
| Program not retained | Memory loss or backup configuration missing | ✅ Medium | Check whether the program was backed up before removal | Restore the site backup and retest |
| Visible board damage | Storage damage, corrosion, or handling issue | ✅ High | Inspect the board, pins, and solder area under bright light | Do not install; request photos and technical support review |
If you are stuck, contact technical support with photos, fault codes, and diagnostic logs.
Frequently Asked Questions
Can I use H4893P4673 as a direct replacement?
Usually only if the issue level, firmware, connector layout, and host system match the original unit. On legacy HARLAND SIMON hardware, the part number alone is not enough.
Is this part new, refurbished, or used?
This listing is best described as new surplus. It is unused inventory from legacy stock, not factory fresh production.
Why is this part considered obsolete?
The OEM no longer produces it, which is common with older control platforms. That is why buyers rely on surplus inventory for spares.
Can I hot-swap this CPU module?
Do not assume that. Power down the rack unless the OEM manual explicitly allows live insertion. Hot-swapping the wrong CPU can damage the backplane.
Will my program stay in memory after replacement?
Not always. Some systems store logic separately, while others depend on the CPU module and site configuration. Back up the original setup before removing anything.
Why is surplus pricing lower than OEM pricing?
Because the part comes from existing inventory, not current production. Lower price does not remove the need to verify revision and compatibility.
What should I check before installing it?
Match the exact part number, confirm the issue level, inspect the connectors, and verify rack power. A clear photo of the old CPU before removal saves a lot of rework.
