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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Number of Points | 16 |
| Output Type | 24 VDC True High |
| Operating Voltage | 20 … 28 VDC |
| Groups | 2 |
| Outputs per Group | 8 |
| Max Current per Point | 2 A continuous / 5 A for 10 ms |
| Max Current per Group | 6 A |
| Max Current per Module | 12 A |
| Leakage Current | 1 mA max @ 24 VDC |
| Response Time (OFF→ON / ON→OFF) | 1 ms |
| Logic Power (+5 V) | 32 mA |
| Logic Power (+4.3 V) | 260 mA |
| External Field Supply | 24 ± 4 VDC, 175 mA (excluding load) |
| Space Required | 1 slot |
| Weight | 1.25 kg (2.75 lbs) |
| Terminal Connector | AS-8534-000 |
| Fusing | One fuse per group |
4. Product Introduction
The Schneider Electric AS-B824-016 is a 16-point discrete output module from the Modicon 800 Series designed for Modicon 984 PLCs. It provides 24 VDC True High outputs arranged in two isolated groups of eight points each, suitable for driving relays, solenoids, motor starters, and other industrial loads.
This module remains a common replacement in legacy Modicon 984 systems still running in manufacturing, material handling, and process plants. Optical isolation, per-group fusing, and 2 A continuous rating per point make it a practical choice when maintaining existing 800 Series racks without a full system upgrade.
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No outputs turn on | Module not powered or fuse blown | ✅ High | Measure 24 VDC field supply; check group fuses | Replace blown fuse or verify supply first |
| Single group dead, other OK | Group fuse open or group wiring fault | ✅ High | Inspect fuse for that group of 8; measure voltage at common | Replace fuse; check field wiring |
| Output stuck ON | Shorted output transistor | ✅ High | Force OFF from PLC; measure voltage at terminal | Replace module if voltage remains present |
| Output stuck OFF | Open output or wiring problem | ✅ Medium | Force ON from PLC; measure voltage at terminal with load connected | Check load and wiring before replacing |
| Intermittent or noisy switching | Loose terminal or high leakage | ❌ Low | Tighten terminals; measure leakage current | Clean and retorque terminals first |
| Module draws excessive logic power | Internal failure | ✅ High | Monitor +5 V / +4.3 V current draw | Replace module if current exceeds ratings |
If the issue continues after these checks, photograph LED status, note the exact terminal voltages, and provide the diagnostic buffer or I/O status screen to technical support.
AS-B824-016
AS-B824-016
6. Frequently Asked Questions (FAQ)
Q: Is the AS-B824-016 still supported by Schneider Electric?
A: No. It is discontinued. Schneider lists migration paths to Modicon X80 modules (such as BMXDDO1602) with adapter cables for modernization projects. New-surplus and tested refurbished units remain available for legacy systems.
Q: Can I hot-swap this module in a running 800 Series rack?
A: No. Always power down the rack or the affected I/O section first. Hot-swapping discrete output modules on 800 Series hardware risks backplane damage or uncontrolled outputs.
Q: What is the difference between True High and True Low versions?
A: The AS-B824-016 is True High (sourcing). When the PLC turns the point ON, it supplies +24 VDC to the load. Confirm your field devices are wired for sourcing outputs before installation.
Q: Do I need a special terminal block?
A: Yes. The correct terminal connector is AS-8534-000. Using the wrong connector can cause pin misalignment or poor contact.
Q: Why are refurbished units significantly cheaper than new surplus?
A: Refurbished units have been removed from service, fully tested under load, and cleaned. New surplus units are unused stock that may still carry original packaging. Both are functionally verified before shipment.
Q: Will the configuration stay the same after replacement?
A: Yes. The I/O mapping and logic live in the 984 CPU program, not on the module. After physical swap you only need to verify the points force correctly.
Q: What are the most common installation mistakes?
A: Exceeding the 6 A group or 12 A module current limits, mixing True High and True Low wiring, and forgetting to replace the group fuses with the correct rating. Always calculate total load current and leave margin.
