Product Details

Modicon AS-B875-011 is a high precision 8 channel differential analog input module and reliable process acquisition card belonging to the Modicon B800 legacy I/O series for 984 PLC racks. This b800 analog card supports differential signal wiring to suppress common‑mode noise, designed to collect analog measurement signals from pressure transmitters, flow sensors, temperature transmitters and level instruments. It accepts standard industrial current and voltage ranges including 4‑20 mA, 1‑5 VDC and other selectable signal levels, converting continuous field analog signals into digital register values readable by the host Modicon CPU. The front panel integrates dedicated LED indicators for active status and out‑of‑range alarm, helping engineers quickly locate broken sensors, wiring faults and over‑range process values. It adopts single‑slot backplane installation and removable swing‑arm terminal blocks for convenient wiring and replacement. As a discontinued legacy spare, this 8 channel analog input module acts as a drop‑in replacement to restore high‑accuracy analog signal acquisition for ageing Modicon 984 automation racks.

Basic Parameters

Brand: Modicon (AEG / Gould legacy)

Model: AS-B875-011

Product Type: 8 Channel Differential Analog Input Module

Compatible Rack: Modicon B800 series backplane, Modicon 984 PLC controllers

Channel Quantity: 8 differential analog input channels

Supported Signals: 4‑20 mA, 1‑5 VDC and other configurable analog ranges

Conversion Resolution: 12‑bit analog‑to‑digital conversion

Termination: Swing‑arm removable screw terminal block

Indicator: Front LED for active operation and out‑of‑range fault

Form Factor: Single slot rack mount

Product Status: Discontinued, end of production

Net Weight: Approximately 0.48 kg

Supported Functions

This 8 channel analog input module executes stable analog‑to‑digital conversion and raw value scaling into engineering units. The process acquisition card provides over‑range and under‑range detection for each channel to identify sensor failure and abnormal process conditions. This b800 analog card transmits converted digital data to the PLC backplane for PID closed‑loop regulation, data logging and alarm triggering. It supports channel‑by‑channel signal configuration and built‑in self‑diagnosis for internal circuit faults and backplane communication errors, greatly shortening maintenance time during plant shutdowns. It can work alongside other B800 discrete and analog modules to build a complete distributed I/O system.

Core Functions

As a dedicated differential acquisition card, this 8 channel analog input module captures weak process signals from field instruments and reduces noise interference through differential sampling. It isolates field wiring interference from the PLC main backplane and delivers accurate measurement data to the controller for closed‑loop process control. This b800 analog card serves as a direct spare to rebuild reliable analog measurement capability for ageing Modicon automation racks.

Hardware Specifications & Environmental Features

Operating Temperature: -10°C ~ +60°C

Storage Temperature: -20°C ~ +70°C

Relative Humidity: 5%–95%, non-condensing

Housing: Heavy-duty industrial plastic single-slot module

Protection: Input overvoltage and overcurrent suppression, out-of-range alarm

Anti-interference: Differential signal design for excellent common-mode noise rejection

Compatibility: Modicon 984 CPUs, B800 backplane and compatible B800 I/O modules

Industry Applications: Applied in legacy petrochemical distributed control, old paper making production automation, material handling conveyor lines, packaging and textile machinery, water treatment remote signal collection and large conveyor remote I/O control racks.

Note：Confirm 800 series backplane compatibility, signal type, channel scaling and differential wiring before ordering.

This is from our current stock.

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