Description
Product Introduction
The Schneider Electric Modicon AS-B824-016 is a 16-point 24 VDC discrete output module (True High design) engineered for installation in legacy Modicon 800 series I/O housings. Operating on a nominal 24 VDC external bus, this heavy-duty card converts central PLC logic commands directly into discrete output driving signals for field devices like intermediate relays, solenoid valves, contactors, and control panel pilot lights.
Built for demanding industrial environments, the AS-B824-016 features optical isolation between low-voltage CPU backplane logic and high-energy field circuitry. Its True High switching configuration provides sinking power control while maintaining independent point isolation within two separate 8-channel groups. This enables flexible multi-bus field wiring setups without adding interposing relay boards or redesigning existing control cabinet footprints.
Key Technical Specifications
| Parameter | Value |
| Product Line | Modicon 800 Series I/O |
| Module Type | Discrete Output (True High) |
| Operating Voltage | 24 VDC nominal (20 to 30 VDC range) |
| Number of Output Points | 16 (2 groups of 8 points per common) |
| Output Current per Point | 2.0 A maximum continuous |
| Maximum Current per Group | 6.0 A maximum |
| Total Module Capacity | 12.0 A maximum continuous |
| Response Time | 1.0 ms max (OFF-to-ON) / 2.0 ms max (ON-to-OFF) |
| Backplane Power Draw | 76 mA at +5 VDC / 480 mA at +4.3 VDC |
| Isolation | Optical isolation between field side and backplane logic |
| Front-Panel Protection | Front-accessible fuses (8A / 250V per group) |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
Application Scenarios & The “Trench” Experience
Picture this: It’s 2:30 AM on a graveyard shift during peak production. A hydraulic indexing station on a main packaging line grinds to a sudden halt because an inductive coil spike shorted a channel on an aging output card in slot 6 of a Modicon 800 rack. The supervisor is tracking downtime costs by the minute, and pulling a full PLC system upgrade is out of the question. You open the panel, verify the blown fuse indicator on the AS-B824-016, and pull an exact surplus drop-in card off the spare parts shelf to restore production before the next shift starts.
- Automotive Stamping & Conveyors: Direct switching of 24 VDC directional hydraulic valves and pneumatic actuators without intermediate relays.
- Material Handling & Warehousing: Driving heavy-duty solenoid brakes, divert gates, and stacker crane position indicator lights across long field runs.
- Water / Wastewater Treatment: Interfacing discrete control commands to low-voltage motor starter coils and valve positioner solenoids in damp MCC rooms.
AS-B824-016
AS-B824-016
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Modicon racks. Every surplus AS-B824-016 unit undergoes a rigorous verification process before leaving our warehouse:
- Inbound Inspection: Mechanical integrity check, pin alignment verification, and anti-counterfeit OEM label check.
- Live Rig Testing: Installed into a live Modicon 800 test rack to confirm backplane communications and verify clear CPU bus handshakes.
- Full Channel Load Checks: Individual channel testing under full 2.0 A load at 24 VDC to ensure output transistors and optocouplers switch cleanly without thermal drift.
- Protective Circuit Audit: Visual and continuity inspection of front-accessible fuse holders and trace continuity.
- Final QC & Anti-Static Packaging: Cleaned, tagged with QA test logs, and sealed inside heavy-duty ESD shielding bags.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Do Not Hot-Swap Under Power: Never insert or remove this module while the chassis backplane is powered up. Pulling this card live risks arcing across the legacy backplane connectors and frying neighboring processor cards or remote I/O adapters. Always drop rack power first.
- ❗ Respect Group Current Limits: While each point handles up to 2.0 A individually, each 8-channel group is capped at 6.0 A total (12.0 A max for the whole card). Simultaneous actuation of high-draw solenoids on a single group will pop the internal group fuse or damage internal copper traces.
- ⚠️ Check Inductive Flyback Suppression: Always verify that field solenoids and contactor coils have diode or MOV surge suppressors installed across their terminals. Inductive voltage spikes during turn-off are the number-one killer of 24 VDC solid-state output cards.
Frequently Asked Questions (FAQ for Conversion)
Q: Is the AS-B824-016 an input card or an output card?
A: The AS-B824-016 is a 16-point 24 VDC discrete output module (True High). If you require a 24 VDC discrete input module for the same Modicon 800 series rack, you need model AS-B825-016.
Q: Is this module hot-swappable?
A: No. Legacy Modicon 800 series racks do not support RIUP (Removal and Insertion Under Power). Shut off main control power to the slot prior to servicing.
Q: Are these modules brand new or refurbished?
A: Our stock primarily consists of New Surplus and Factory Sealed inventory sourced from plant consolidations and global liquidations. Every unit undergoes live bench testing on an actual Modicon rack prior to shipment.
Q: Why is your price lower than direct OEM channels?
A: Schneider Electric / Modicon transitioned the 800 series I/O product family to end-of-life status years ago. Traditional factory channels mark up legacy parts heavily to force expensive migration projects. We supply original certified surplus hardware to keep legacy lines running affordably.
Q: What warranty comes with the module?
A: Every AS-B824-016 unit includes a comprehensive 12-month full-replacement warranty.
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