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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Type | Single Cable RIO Interface / Drop Adapter |
| Data Rate | 1.544 Mbps |
| Connector | Single F-type coaxial port |
| I/O Capacity | 1024 input bits + 1024 output bits |
| Cable Topology | Linear and dual configurations supported |
| Power Requirement | 1.85 A at +5 V |
| Hold-Up Time | Adjustable 0.3 s to 100 s (100 ms steps) |
| Communication Time | < 1 ms for 256 I/O points |
| Address Configuration | DIP switches (drop address) |
| Indicators | READY, COMM ACTIVE, COMM ERROR, CURBUS ERROR |
| Module Width | 1.5 slots |
| Controller Compatibility | Modicon 984 on S908 RIO network |
| Weight | Approx. 1.6–1.81 kg (3.5–4.0 lbs) |
| Status | Discontinued by manufacturer |
4. Product Introduction
The Schneider Electric AS-J890-101-1004 is a single-cable Remote I/O processor module from the Modicon 800 Series. It serves as the drop adapter that links 800 Series I/O racks to a Modicon 984 controller over the S908 RIO network using a single F-type coaxial cable.
This module handles up to 1024 input and 1024 output bits at 1.544 Mbps and remains a common spare in legacy plants that still run 984/800 systems. DIP-switch addressing, built-in diagnostics, and LED status indicators make it straightforward to commission or replace in existing RIO drops.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No communication (COMM ERROR LED) | Cable fault, terminator missing, or wrong drop address | ✅ High | Verify coax continuity, terminators, and DIP switch address | Correct cabling and address before replacing module |
| READY LED off | Power or backplane issue | ✅ High | Measure +5 V at module; check rack power | Confirm supply and seating first |
| Intermittent COMM ACTIVE | Loose F-connector or noise | ✅ Medium | Reseat F-connector; inspect cable shield | Repair or replace coax run |
| CURBUS ERROR | Local I/O bus problem at the drop | ✅ High | Check 800 Series modules in the remote rack | Isolate faulty I/O card in the drop |
| Module not recognized by CPU | Address conflict or defective unit | ✅ High | Confirm unique drop number; reseat module | Replace module if address and power are correct |
If the fault persists, record all LED states, note the exact drop address settings, and capture any diagnostic codes from the 984 controller for technical support.
AS-J890-101-1004
AS-J890-101-1004
6. Frequently Asked Questions (FAQ)
Q: Is the AS-J890-101-1004 still manufactured?
A: No. It is discontinued. New-surplus and fully tested refurbished units are the available options for maintaining existing S908 RIO networks.
Q: What is the difference between the -101 and -102 versions?
A: The AS-J890-101 has a single RIO coaxial port. The AS-J890-102 has two ports for dual-cable (redundant) configurations. Confirm your network topology before ordering.
Q: How is the drop address set?
A: Via the onboard DIP switches. Address 1 is typically all switches off; the range covers up to 32. Always photograph the existing switch settings before removal and match them exactly.
Q: Can this module be used with Quantum controllers?
A: It is designed primarily for 984 controllers on the S908 network. Quantum systems normally use different RIO adapters (CRP/CRA series). Verify compatibility with your specific controller before installation.
Q: Does it support ASCII?
A: No. The AS-J890-101 does not support ASCII ports. Use a different adapter if ASCII communication is required.
Q: Can I hot-swap this module?
A: No. Power down the remote drop or the entire RIO segment before removal or insertion to avoid communication faults or hardware damage.
Q: Why choose a tested refurbished unit?
A: These modules undergo full communication and diagnostic testing under load. They restore existing RIO drops quickly while carrying a warranty, avoiding the long lead times and higher cost of scarce new-surplus stock.
