Overview

The ABB CBI20 Binary Input Module is designed for precise and reliable digital signal acquisition in distributed control and safety systems. Featuring 32 input channels divided into two independent supply groups, it enables flexible wiring, fast event detection, and robust fault isolation. Part of ABB’s Melody series, it is widely deployed in power generation, chemical processing, and industrial automation.

The CBI20 offers 1 ms time resolution, making it ideal for time-critical applications. Its central galvanic separation between system inputs and internal electronics enhances signal integrity and safety. Therefore, it is suitable for environments where electrical noise, isolation, and uptime are critical.

For instance, in a turbine control system, the CBI20 can monitor limit switches and interlocks with millisecond precision, ensuring safe and responsive operation.

Technical Data

Typical Applications

• Power Generation Systems: Monitors turbine interlocks, switches, and alarms.

• Chemical and Petrochemical Plants: Interfaces with safety contacts and process control signals.

• Manufacturing Automation: Captures fast digital events from sensors and actuators.

• Safety Instrumented Systems (SIS): Supports fault-tolerant input acquisition in critical control loops.

• Substation and Grid Control: Detects breaker positions and relay statuses in high-voltage networks.

The CBI20 is also used in retrofit projects, replacing legacy input modules with high-speed, reliable alternatives.

FAQ

Q1: What types of signals can the CBI20 handle?
A1: NC/NO contacts, changeover contacts, NAMUR initiators, and 3-wire sensors.

Q2: Is the module suitable for safety-critical applications?
A2: Yes, it features galvanic isolation and redundancy, making it ideal for SIS environments.

Q3: What is the input voltage range?
A3: 8.2 V, 24 V, and 48 V depending on signal type.

Q4: Can it detect fast signal changes?
A4: Yes, it records events with 1 ms time resolution.

Q5: Is it easy to install?
A5: Yes, it supports DIN rail and panel mounting for flexible integration.