Description
Schneider Electric AS-B875-111 – Modicon 800 Series discrete I/O module for sustaining 984/584 installations
The Schneider Electric AS-B875-111 sits in the Modicon 800 Series I/O family—commonly used alongside 984/584 PLCs—to keep legacy lines running without forcing a full system migration. From my experience, the “-111” variant is typically supplied as a 115 Vac discrete input module (16 points is common in many cabinets), making it a straightforward drop-in when you’re replacing ageing cards in older racks. You might notice that it’s all about stability: predictable behavior on the backplane, clean wiring on the terminal strip, and easy diagnostics for maintenance teams who know these systems well.
If you’re matching an installed base, we can help verify the exact point count and terminal style from a rack photo or existing BOM. That simple check usually prevents surprises during a shutdown window.
Our Order Placement Process and Guarantees
- Warranty: 365 days coverage.
- Delivery time: In-stock items typically ship within 1 week; no more than one month at the latest.
- Payment terms: 50% advance payment; full payment prior to delivery.
- Express options: FedEx, UPS, DHL.
- Pre-ship testing: Functional checks on I/O channels and backplane comms before dispatch, which in many cases saves one on-site visit.
Key Features
- Legacy 800 Series compatibility: Plugs into standard Modicon 800 Series I/O racks used with 984/584 controllers.
- Discrete input (115 Vac, typical for -111): Designed for plant AC signaling—limit switches, contactors, and panel indicators.
- Backplane-powered logic: Draws logic power from the rack, so field supply is only for the input circuits.
- Rugged construction: Built for electrical noise found around MCCs and older switchgear; tends to behave predictably in mixed-voltage cabinets.
- Service-friendly terminals: Field wiring via terminal strip—quick to land conductors during swap-outs.
- Drop-in replacement strategy: Minimizes code or wiring changes; helps keep scheduled downtime short.
Technical Specifications
| Brand / Model | Schneider Electric / AS-B875-111 (Modicon 800 Series I/O) |
| HS Code | 853890 (Parts for switchgear, control panels, PLC I/O) |
| Power Requirements | Backplane-powered via 800 Series rack (logic supply); field voltage for input circuits as per 115 Vac discrete input usage |
| Operating Temperature | 0 to 60 °C (typical for Modicon 800 Series modules) |
| Signal Input/Output Types | Discrete input, 115 Vac nominal (commonly 16 points for “-111” variant; confirm before ordering) |
| Communication Interfaces | 800 Series backplane bus to 984/584 CPU |
| Installation Method | Plug-in to Modicon 800 Series I/O rack; field wiring on terminal strip |
Note: Specific point count and terminal block style can vary by production batch; in most cases we can confirm from a rack photo or your legacy manual reference.
Application Fields
- Water & Wastewater: Lift stations, blower controls, clarifier interlocks using long-standing AC field wiring.
- Process Industries: Pulp & paper, chemicals, and food plants where Modicon 984/584 architectures are still running reliably.
- Metals & Mining: Motor starters and limit switches operating on 120 Vac signaling.
- Power & Utilities: Legacy balance-of-plant I/O with AC status inputs.
- OEM Lines (Service Support): Sustaining older equipment without rewriting PLC programs.
Advantages & Value
- Reliability: Proven behavior on 800 Series racks; fewer surprises during shutdowns.
- Compatibility: Seamless mechanical and electrical fit with Modicon 800 Series bases and 984/584 controllers.
- Cost Control: Replace only what’s failed—avoid an immediate control-system migration.
- Procurement Confidence: Functionally tested items, clear HS code, and consistent packing for international transit.
- Technical Support: Guidance on channel mapping and terminal identification, which in many cases speeds commissioning.
Installation & Maintenance
- Cabinet standards: Install in a clean, dry enclosure; typical target 0–60 °C with adequate ventilation.
- Rack guidelines: Ensure the 800 Series rack and power supply are within load limits before adding or swapping a module.
- Wiring: For 115 Vac inputs, use appropriately rated cables, ferrules, and proper shielding away from high-voltage feeders.
- Grounding: Bond cabinet ground and follow single-point grounding practices to reduce noise pickup.
- Safety: Isolate power and lockout/tagout before removing the module; verify absence of voltage on field terminals.
- Routine checks: Periodic terminal tightness check, dust cleaning, and verification of channel status LEDs during maintenance windows.
- Documentation: Keep channel map and cross-reference updated; it seems to prevent half the troubleshooting calls later.
Quality & Certifications
- Certifications: Typically CE and UL for industrial control equipment (legacy modules may vary by production year).
- RoHS: Legacy products may carry exemptions; let us know if you have a strict RoHS requirement.
- Warranty: 365-day warranty provided by us on this item.
- Testing: Functional verification on backplane comms and channel states prior to shipment.
Helpful Accessories (commonly paired)
- Modicon 800 Series I/O rack/base: Required backplane for the module; verify slot availability and power budget.
- 800 Series power supply: Provides the 5 Vdc logic to the backplane; sizing depends on total module count.
- Terminal strips and labels: Clean termination and channel identification for faster maintenance turnarounds.
- Shielded field cabling: Recommended where AC inputs run near VFDs or high-current feeders.
Customer note from a recent retrofit: “Swapped an AS-B875-111 during a 6-hour outage—no wiring changes, all inputs came up exactly as before. Saved us from re-mapping tags.”
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