Overview

The ABB DI820 Digital Input Module is a robust I/O unit designed for ABB AC 800M controllers and the S800 I/O system. It provides 8 individually isolated input channels capable of reading both AC and DC signals, making it versatile for a wide range of industrial applications.

Each channel features current limiting, EMC protection, optical isolation, and input state LEDs, ensuring safe and accurate signal acquisition. The module also includes voltage supervision capability: channel 1 can supervise channels 2–4, and channel 8 can supervise channels 5–7. If the supervision voltage disappears, error inputs are triggered, and a warning LED alerts operators.

This makes the DI820 especially valuable in critical process industries where reliable digital input monitoring is essential.

Technical Data

Typical Applications

• Process industries: Monitoring limit switches, sensors, and interlocks in chemical and pharmaceutical plants.

• Power generation: Capturing digital signals from turbine and boiler systems for safe operation.

• Water treatment: Supervising pumps, mixers, and flow sensors.

• Manufacturing automation: Integrating machine safety signals, operator panels, and interlocks.

• Infrastructure systems: Supporting building automation and utility monitoring.

Example: In a steel plant, the DI820 monitors high-voltage limit switches, ensuring critical safety interlocks are always active and reported to the control system.

FAQ

Q1: How many channels does the DI820 provide?
A1: It offers 8 digital input channels.

Q2: What voltage ranges are supported?
A2: 77–130 V AC and 75–145 V DC.

Q3: Does the DI820 include diagnostics?
A3: Yes, it provides voltage supervision, error inputs, and warning LED indicators.

Q4: What controllers is it compatible with?
A4: It integrates with ABB AC 800M controllers and the S800 I/O system.

Q5: What termination units are required?
A5: TU811, TU813, TU831, TU839, or TU851.