Overview

The ABB DO840 Digital Output Module is a high‑performance I/O unit designed for the S800 I/O system and ABB’s AC 800M controllers. It provides 16 galvanically isolated digital output channels, delivering reliable 24 V DC signals to actuators, relays, and other field devices. Moreover, the DO840 ensures fast response times and robust diagnostics, making it suitable for demanding industrial automation environments. In addition, its compact DIN‑rail design and hot‑swap capability simplify installation and maintenance, reducing downtime in mission‑critical operations. Therefore, engineers rely on the DO840 for consistent performance and seamless integration into distributed control systems.

Technical Data

Typical Applications

• Process industries: Driving solenoids, relays, and actuators in chemical and pharmaceutical plants.

• Power generation: Controlling turbine and boiler systems with reliable digital outputs.

• Water treatment facilities: Operating pumps, mixers, and monitoring equipment.

• Manufacturing automation: Providing digital signals for machine interlocks, operator panels, and safety systems.

• Infrastructure systems: Supporting building automation and utility monitoring networks.

For instance, engineers often deploy the DO840 in distributed control systems where fast switching and galvanic isolation are essential. Moreover, its hot‑swap capability minimizes downtime, while diagnostic LEDs simplify troubleshooting.

FAQ

Q1: How many channels does the DO840 provide?
A1: It offers 16 galvanically isolated digital output channels.

Q2: What is the maximum output current per channel?
A2: Each channel supports up to 0.5 A at 24 V DC.

Q3: Is the DO840 hot‑swappable?
A3: Yes, it can be replaced without shutting down the system, reducing downtime.

Q4: What industries typically use the DO840?
A4: It is widely applied in power generation, chemical processing, water treatment, and manufacturing automation.

Q5: Does the DO840 provide diagnostics?
A5: Yes, it includes channel‑level supervision and LED indicators for real‑time monitoring.