Description
Modicon AS-B824-016 | 24VDC 16-Channel True High Output Module
Product Introduction
When an established Modicon 984 control architecture experiences output stage dropouts or component wear on its DC switching lines, maintaining process uptime depends on securing exact drop-in hardware. The Modicon AS-B824-016 is not a generic solid-state switch; it is an engineered 16-channel discrete DC output module built explicitly to handle 24VDC “True High” logic schemes within demanding industrial environments. Designed to slide directly into standard Modicon 800-series drop racks, the unit divides its 16 output points into two isolated groups of eight, ensuring localized fault containment.
Operating at the critical interface between controller logic and field actuators, the module delivers fast, low-latency switching responses—though your mileage may vary depending on external inductive load suppression and cabinet thermal profiles. It keeps legacy automation systems running efficiently without requiring a complete control architecture overhaul.
AS-B824-016
Key Technical Specifications
| Parameter | Specification |
| Manufacturer / Brand | Modicon (Schneider Electric / AEG) |
| Model Designation | AS-B824-016 (B824-016) |
| Module Type | 16-Channel Discrete DC Output Module (True High) |
| Operating Voltage | 20 to 28 VDC |
| Number of Outputs | 16 points (divided into 2 groups of 8 outputs per common) |
| Output Current Ratings | Max 2.0 A continuous per point; Max 6.0 A per group; Max 12.0 A per module |
| Isolation Rating | Optical coupler isolation per channel |
| Diagnostic Indicators | Front-panel individual channel status LEDs |
| Mounting Architecture | Standard Modicon 800 Series I/O rack backplane slot |
| Operating Temperature | 0°C to 60°C standard industrial thresholds |
Application Scenarios & Pain Points
- Automotive Assembly Line Conveyor Control: A manufacturing plant in the Midwest kept experiencing intermittent logic lockups on high-speed DC solenoid valves due to transient voltage feedbacks until swapping in a verified Modicon AS-B824-016 module, which restored clean channel isolation.
- Packaging Machinery Actuator Sequencing:
- Without AS-B824-016: Aging output cards suffered from degraded optical couplers, causing delayed signal propagation and dropped packaging steps.
- With AS-: Rapid 1ms switching response times ensure strict timing alignment across multi-axis pneumatic cylinder banks.
- Harsh Industrial Enclosures: Housed inside high-vibration local control cabinets, the module’s secure card retention clips maintain solid backplane engagement under continuous mechanical shock.
QA & Live Testing SOP (Trust Signal)
Legacy DC output cards require rigorous electrical testing to ensure optical isolation barriers and power MOS/transistor stages switch cleanly under load. Every AS- unit processed through our facility undergoes a strict evaluation protocol:
- Visual & Optical Inspection: Inspected under magnification for component thermal wear, electrolytic capacitor health, and pristine backplane connector gold fingers.
- Backplane Bus Verification: Inserted into a Modicon 800-series test chassis to confirm proper power rail startup and rack communication handshakes.
- Multi-Channel DC Load Testing: Energized via system logic commands while applying test loads across all 16 channels to verify clean voltage switching, current handling up to group limits, and proper LED status feedback.
- Protective Packaging: Sealed in heavy anti-static shielding bags and packed in custom cut-foam containers to prevent static discharge and transit shock.
Field Engineer’s Pitfall Guide
- ❗ Inductive Kickback Protection: Always ensure flyback (freewheeling) diodes are installed across DC inductive loads like solenoids and relay coils. Failing to suppress back-EMF will prematurely degrade or fry the module’s internal solid-state output switches.
- ❗ Group Current Limits: Never exceed the maximum group current rating (6.0 Amps per 8-point common group) or total module limit (12.0 Amps). Overloading a common rail will trip internal protection fuses or damage trace layouts.
- ❗ Hot-Insertion Hazards: Avoid sliding modules into live, powered drop racks unless the chassis is specifically rated for hot-swapping, as sparking can pit and damage backplane interface pins.
Intent-Driven FAQ
What does “True High” mean for the AS- output module?
“True High” indicates that the module sources current to the field load (positive DC voltage is switched out to the device when the output turns ON, relative to a common ground return).
Are these units supplied as New Surplus or refurbished working pulls?
We maintain inventory in both factory-sealed New Surplus (NSMP) packaging and thoroughly bench-tested, certified working pulls backed by an extensive operational warranty.
What terminal connector does this module require for field wiring?
The module utilizes a standard Modicon removable terminal block connector (commonly mapped to part reference AS-8534-000) for clean field wire termination.
Does the module require an external power supply?
Yes, in addition to the logic power drawn from the rack backplane, an external 24VDC power source (\pm 4 VDC) is required to supply power to the field load switching circuits.
