Model Number Explanation

AS: Modicon Automation System component

B239: Special-purpose high-speed counter module series

001: Standard version (dual-channel, 30kHz, no conformal coating)

Technical Specifications

Function: Dual-channel high-speed counter, 2 independent channels

Input Frequency: Max 30kHz per channel (single-phase/differential)

Input Signal: 5–24VDC pulse, NPN/PNP compatible

Counting Mode: Up/down counting, quadrature (A/B phase) counting

I/O Data: 2 input words, 2 output words (2/2 words)

Isolation: Channel-to-backplane 1500VAC isolation

Operating Temperature: 0°C to +40°C

Storage Temperature: −40°C to +70°C

Humidity: 5%–80% non-condensing

Protection Class: IP20

Dimensions: 125 × 90 × 75mm (W×H×D)

Weight: ≈0.53kg

Interface & Configuration

Backplane: Modicon 984 series I/O bus connector

Input Terminals: Screw terminals (2 channels + power + common)

Status Indicators: Channel RUN/COUNT LEDs, module FAULT LED

Mounting: 19-inch rack or DIN rail

Wiring: 0.5–2.5mm² copper wires

Key Features

Dual High-Speed Channels: 2 independent 30kHz counters for simultaneous pulse acquisition

Multi-Mode Counting: Supports up/down, quadrature, and gate control counting

High Isolation: 1500VAC isolation reduces electrical noise interference

Compact Design: Standard I/O module size for easy integration

Diagnostic LEDs: Real-time status monitoring for each channel

Legacy Compatibility: Fits Modicon 984 series racks and CPUs

Applications

Systems: Modicon 984 series PLC systems

Industries: Material handling, packaging, textile machinery, motion control

Use Cases: Encoder signal acquisition, high-speed pulse counting, position monitoring, speed measurement

Compatibility

Racks: Modicon 984 series 8/11-slot backplanes

CPUs: AS-9370-001, AS-984B-128, PC-E984-685

Software: Concept, ProWORX 32, P190

Status

Discontinued: Obsolete, no longer manufactured

Availability: Refurbished/used units with 1-year warranty