ABB DI651 3BHT300026R1 Digital Input Module

1. Product Overview

The ABB DI651 (Order Code 3BHT300026R1) is a digital input module used in ABB 800xA, Advant, and AC800M control systems. It receives and processes digital (ON/OFF) signals from field devices such as sensors, limit switches, push buttons, and relays. With high reliability and strong noise immunity, the DI651 is essential in industrial automation and process control applications.

2. Technical Specifications

General

• Model: DI651

• Ordering Code: 3BHT300026R1

• Module Type: Digital Input Module

• Channels: 16 inputs

Electrical

• Input Voltage: 24V DC

• Logic Levels:

  • Logic “1”: >15V DC

  • Logic “0”: <5V DC

• Input Current: 5–10mA (typical)

• Input Delay: 5–10ms

• Isolation: galvanic isolation between field and system bus

• Group Isolation: by channel groups

Performance

• Fast scan cycle for real-time control

• Hardware/software noise filtering

• Diagnostic functions for input channel health

Environmental

• Operating Temperature: –20°C to +55°C

• Storage: –40°C to +85°C

• Humidity: 5–95% non-condensing

• Mounting: DIN rail / rack-mounted

3. Features & Advantages

1. Reliable digital input acquisition for industrial control.

2. Excellent noise immunity for harsh environments.

3. High-density 16-channel design saves panel space.

4. Built-in diagnostics for improved maintenance.

5. Fully compatible with ABB 800xA / AC800M systems.

6. Modular, easy to maintain and replace.

4. Application Areas

• DCS/PLC automatic control systems

• Production line status monitoring

• Petrochemical, power, and gas plant logic control

• Water treatment and environmental automation

• Feedback signals from actuators and equipment

• Sensor and limit switch input acquisition

• Building automation (fire, security, monitoring)

5. Precautions & Maintenance

1. Ensure field voltage matches the module rating.

2. Use shielded cables for long-distance inputs.

3. Do not connect AC or high-voltage signals to DI channels.

4. Follow grounding and isolation best practices.

5. Regularly check terminals for looseness or corrosion.

6. Avoid inserting/removing the module under power unless supported.

7. Verify each DI channel during commissioning.

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