WhatsApp: +86 16626708626
Email: 
Phone: +86 16626708626Description
Key Technical Specifications
- Part Number: H4893P4681
- Manufacturer: HARLAND SIMON
- Product Type: Microprocessor card
- Series: Intella 120
- Application: Legacy industrial control and PLC systems
- Status: Obsolete / repairable in the surplus market
- Availability: Limited stock
- Condition: New Surplus
- Warranty Note: New units may carry 12-month return-to-base coverage from some sellers; reconditioned units often carry shorter terms
- Replacement Note: Verify exact issue level and host system compatibility before installation
Product Introduction
HARLAND SIMON H4893P4681 is a microprocessor card used in legacy Intella 120 industrial control systems. It is typically sourced as a replacement part for older automation equipment where the exact part number and revision matter.
This model appears in the surplus market as an obsolete, repairable card, so buyers should confirm condition, issue level, and compatibility before ordering. In practice, this is the kind of part you buy to keep an installed system running without changing the control architecture.
- H4893P4681
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 PSU and rack before replacing the card |
| CPU fault or system halt | Processor failure, firmware mismatch, or corrupted configuration | ✅ High | Read the diagnostic buffer and compare it with the original card | Verify the exact issue level 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 card 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 missing backup | ✅ 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 review |
If you are stuck, contact technical support with photos, fault codes, and diagnostic logs.
Frequently Asked Questions
Can I use H4893P4681 as a direct replacement?
Usually only if the issue level, firmware, connector layout, and host system match the original unit. With older 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 do some listings call it repairable?
Because obsolete control cards often enter the aftermarket in mixed condition. Some units are sold for repair, while others are sold as tested surplus, so you need to check the seller’s condition note.
Can I hot-swap this card?
Do not assume that. Power down the rack unless the OEM manual explicitly allows live insertion. Hot-swapping the wrong card 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 card 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 card before removal saves a lot of rework.
