Bidirectional Digital I/O Module

Functional Overview

Bidirectional Signal Processing
The module integrates both Digital Input (DI) and Digital Output (DO) channels, allowing simultaneous signal acquisition and control output.

Input Function: Collects real-time status signals from field devices such as sensors, limit switches, and feedback contacts.

Output Function: Delivers control signals to actuators, including relays, solenoid valves, and other field equipment.
This enables “monitoring–control” integration, reducing wiring complexity and improving system responsiveness.

Design Features

High-Reliability Architecture

Employs channel-level electrical isolation to prevent damage or interference from external signals.

Supports fault self-diagnosis, continuously monitoring channel status.

In the event of an abnormality, the module reports alarm information via the system bus, allowing fast troubleshooting and minimizing downtime.

Industrial Environment Adaptation

Designed for robust performance in electrically and physically demanding environments.

Provides strong electromagnetic compatibility (EMC), ensuring stable operation in areas with dust, vibration, and temperature fluctuations.

Suitable for heavy-duty applications such as power generation, chemical processing, and metallurgical industries.

Key Technical Specifications

Category	Specification
Power Supply	24 VDC nominal (tolerates ±10% voltage fluctuation)
Input Channel Characteristics	Supports dry or wet contact signals; input current approx. 4–8 mA
Output Channel Characteristics	Relay or transistor output (depending on model); load capacity ≤ 2 A per channel
Operating Temperature Range	−20 °C to +60 °C (optional versions support −40 °C cold start)
Protection Level	IP20 (requires cabinet-level protection for full system compliance)
Installation	DIN rail mounting, compatible with ABB standard I/O subracks (e.g., 800xA series)
Module Dimensions	Standard compact form factor suitable for modular installation

Application Areas

Distributed control systems (DCS) and programmable logic controllers (PLC)

Industrial process automation and machine control

Equipment monitoring and actuator control in power, petrochemical, and metallurgical systems