Schneider Electric AS-B814-108 – 8‑Channel Analog Input Module for Modicon 800 Series/984 Systems

The Schneider Electric AS-B814-108 is a legacy Modicon 800 Series I/O module designed for 984-class PLC systems. From my experience, this model is commonly used as an 8‑channel, 14‑bit analog input card, giving you reliable analog signal acquisition (voltage or current) on long‑running production lines without reengineering the whole rack. If you’re maintaining installed 984 architectures, this module helps you replace like‑for‑like, keep the wiring base, and get your plant back online fast.

Company’s Order Placement Process and Guarantees

• Warranty: 365 days coverage.
• Lead time: Typically 1 week if in stock; no more than one month at the latest.
• Payment: 50% advance payment; full payment prior to delivery.
• Express shipping: FedEx, UPS, DHL.

Key Features

• 8 analog input channels – Suited for multi-point process sensing where panel space is tight.
• 14‑bit resolution (series-typical) – Provides stable, repeatable signal conversion for control loops.
• Voltage/Current flexibility – Commonly used ranges such as 0–10 V or 4–20 mA, helping standardize field devices.
• Backplane powered – Draws power from the 800 Series rack; no external supply wiring to the module.
• LED diagnostics – Quick visual status to speed up commissioning and fault isolation.
• Drop‑in for 984 architectures – Helps keep legacy racks and bases in service with minimal downtime.
• Stable sourcing for MRO – In many cases, avoids the need to redesign around newer platforms.

Technical Specifications

The details below reflect typical characteristics for Modicon 800 Series analog input modules and the AS‑B814 family. If you’re matching a specific plant standard, share your rack/base part numbers and we’ll confirm compatibility before shipment.

Application Fields

You’ll typically see the AS‑B814‑108 in brownfield upgrades and MRO programs where a 984 PLC must stay in place:

• Process industries: temperature, pressure, and flow sensing for legacy DCS/PLC islands.
• Water & wastewater: analog transducer inputs across distributed panels.
• Metals, pulp & paper, cement: stable analog acquisition with long cable runs.
• OEM machinery support: lifecycle extension where revalidation is costly.

One thing I appreciate is how it keeps legacy wiring bases and channel mapping intact, which in many cases saves a weekend of rewiring and re‑testing.

Advantages & Value

• Compatibility – Works within the established 800 Series/984 ecosystem, preserving I/O addressing and rack layouts.
• Reduced downtime – Drop‑in replacement strategy minimizes change control and validation effort.
• Cost control – Avoids premature migrations when production availability is the priority.
• Technical support – We verify rack/base compatibility and can share wiring notes before you schedule a shutdown.

A maintenance manager recently mentioned that swapping an AS‑B814‑108 into an existing base cut their planned outage from 10 hours to under 3, mainly because the analog scaling and channel order didn’t change.

Installation & Maintenance

• Panel/rack – Install in a clean, ventilated enclosure; maintain clearance for convection and service access.
• Wiring – Use shielded twisted pair for analog runs; ground shields at one end to limit noise. Route away from VFDs and power cables.
• Signal ranges – Match each channel’s range (e.g., 4–20 mA) to field devices; confirm jumper or base selection where applicable.
• Safety – Power down the rack before inserting or removing modules; verify isolation of field loops.
• Routine checks – Periodically inspect terminals for looseness, clean dust with dry air, and verify scaling against a reference signal.
• Firmware – On this generation, user firmware updates are rarely required; keep CPU/ladder documentation aligned with channel assignments.

Quality & Certifications

• Manufacturer certifications for this series typically include CE and UL. RoHS compliance may depend on manufacturing date.
• All units are covered by our 365‑day warranty and are function‑tested prior to dispatch.

If you can share the rack base part number and the analog ranges you’re standardizing on, I’ll double‑check the AS‑B814‑108 against your exact setup and confirm delivery dates.