Product Details

Modicon AS-B875-101 is a high-precision analog input module and reliable analog acquisition card designed for Modicon 800 series backplane and Modicon 984 PLC racks. This field sensing module collects continuous analog signals from transmitters, pressure sensors, flow meters and temperature transducers, and converts raw analog values into digital data readable by the main PLC CPU. It supports both 4–20 mA current and 1–5 VDC voltage signals with 12‑bit conversion resolution to guarantee stable and accurate field sensing. As a discontinued legacy spare, this analog input module serves as a drop-in replacement for failed I/O cards, helping ageing process control racks resume precise signal acquisition without overhauling the whole automation system.

Basic Parameters

Brand: Modicon

Model: AS-B875-101

Product Type: Analog Input Module

Compatible Rack: Modicon 800 series backplane, Modicon 984 PLC

Input Channels: 8 single-ended analog channels

Resolution: 12-bit

Signal Range: 4–20 mA, 1–5 VDC

Status Indicator: LED for active, over-range and under-range alarms

Mounting: Standard rack slot mounting

Product Status: Discontinued legacy spare

Net Weight: Approximately 0.35 kg

Supported Functions

This analog input module supports high-speed analog-to-digital conversion, signal scaling and engineering unit conversion. The analog acquisition card provides over-range and under-range detection to identify broken sensors or abnormal field signals. This field sensing module transmits converted digital values to the backplane for the CPU to execute PID regulation, data logging and alarm triggering. It also supports channel configuration and built-in self-check to simplify on-site commissioning and fault troubleshooting.

Core Functions

As a critical analog acquisition card, this analog input module captures real-time process signals from field sensors and converts them into digital data for the host controller. It filters noisy raw signals and reports out-of-limit conditions for timely intervention. This field sensing module acts as a direct spare to restore reliable analog data collection 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: Compact industrial module shell

Protection: Signal over-range detection and input surge suppression

Anti-interference: Built-in low-pass filtering for industrial signal lines

Compatibility: Matches 800 series backplane and compatible peripheral 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, pulse signal type, counting mode and preset logic before ordering.

This is from our current stock.

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