Schneider AS-BDAP-208 – 8-Point Relay Output Module | Modicon 984 Series
Engineering Background: The AS-BDAP-208 is a discrete relay output module engineered for the Schneider Electric Modicon 984 programmable controller platform — one of the most widely deployed PLC architectures in process automation, utilities, and heavy manufacturing. Designed to interface directly with the Modicon 984 I/O bus, this module delivers robust, electrically isolated relay switching for field devices operating across a broad voltage range.
Product Positioning: Targeted at maintenance engineers, system integrators, and MRO procurement teams managing legacy Modicon 984 installations, the AS-BDAP-208 provides a direct OEM-equivalent replacement with no firmware or rack reconfiguration required. Konmask.com maintains verified stock sourced through authorized industrial distribution channels, ensuring full traceability and authenticity.
Complete Technical Specifications
- Part Number / SKU: AS-BDAP-208
- Manufacturer: Schneider Electric (formerly Modicon)
- Series / Platform: Modicon 984
- Module Type: Discrete Relay Output
- Number of Output Points: 8
- Output Type: Relay (dry contact, normally open)
- Output Voltage Range: 24 VDC – 240 VAC
- Maximum Load Current: 2 A per point (resistive load)
- Isolation: Electrically isolated outputs
- Backplane Interface: Modicon 984 I/O bus
- Operating Temperature: 0 °C to 60 °C
- Storage Temperature: –40 °C to 85 °C
- Relative Humidity: 5% – 95% non-condensing
- Product Weight: 3,300 g (shipping weight)
- Compliance: CE, UL listed (verify current certification status with datasheet)
Proven Application Environments
- Oil & gas pipeline control and SCADA systems
- Water and wastewater treatment plant automation
- Power generation and substation control
- Pulp, paper, and chemical process control
- Automotive and heavy manufacturing assembly lines
- Building management and HVAC control systems
- Mining and materials handling conveyor control
Engineering Advantages
- Direct Drop-In Replacement: Fully compatible with existing Modicon 984 racks and backplanes — no re-engineering required.
- Wide Voltage Compatibility: Relay outputs support both AC and DC field devices, reducing the need for interposing relays.
- Electrical Isolation: Protects the PLC backplane from field-side voltage transients and ground loops.
- Proven Reliability: Modicon 984 I/O modules are field-proven across decades of continuous industrial operation.
- Minimal Downtime: Hot-swap capable within Modicon 984 rack architecture (verify with system documentation).
System Architecture & Signal Flow
The AS-BDAP-208 connects to the Modicon 984 CPU via the proprietary I/O bus on the backplane. The CPU writes output coil states to the module’s internal register map. Each of the 8 relay output points is driven by an internal relay coil; when energized, the normally-open contact closes, completing the field-side circuit. Field wiring connects to the module’s terminal block, which is isolated from the backplane logic circuitry. Status LEDs on the module faceplate provide real-time visual indication of each output state, enabling rapid field diagnostics without a programming terminal.
Sourcing & Quality Verification
- Stock Origin: Sourced through verified industrial distribution and decommissioned OEM-maintained installations.
- Inspection Standard: Each unit undergoes visual inspection, label verification, and functional pre-shipment checks.
- Authenticity: Konmask.com does not deal in counterfeit or remarked components. All units are traceable to documented supply chains.
- Condition: New surplus or refurbished units available — condition specified at time of quotation.
- Warranty: 12-month operational warranty against manufacturing defects (terms apply).
Procurement Process
- Confirm part number AS-BDAP-208 against your Modicon 984 system BOM or rack label.
- Submit your RFQ or purchase order via Konmask.com or email support@konmask.com.
- Receive stock availability confirmation and lead time within 1 business day.
- Approve proforma invoice; payment processed via T/T, PayPal, or agreed terms.
- Unit ships with inspection report, packing list, and tracking number.
- Post-delivery technical support available via email or phone.
Technical FAQ
Q: Is the AS-BDAP-208 compatible with Modicon 984-385 and 984-685 CPUs?
A: Yes. The AS-BDAP-208 is designed for the Modicon 984 I/O bus and is compatible across the 984 CPU family. Verify slot addressing with your system configuration documentation.
Q: Can relay outputs switch inductive loads such as motor starters or solenoids?
A: Yes, with appropriate derating. For inductive loads, apply a suppression device (RC snubber or MOV) across the load to protect relay contacts and extend service life.
Q: What is the maximum number of AS-BDAP-208 modules per rack?
A: Determined by the Modicon 984 rack size and power budget. Consult the Modicon 984 Hardware Reference Guide (890 USE 101 00) for slot and power allocation rules.
Q: Are replacement modules available with factory firmware?
A: The AS-BDAP-208 is a hardware I/O module with no user-programmable firmware. Configuration is managed entirely through the Modicon 984 CPU and programming software (Modsoft / Concept).
Q: What is the lead time for AS-BDAP-208?
A: In-stock units ship within 3–5 business days internationally. Contact us for current availability.
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