ABB DI821 230V AC/DC Digital Input Module

Product Overview

The ABB DI821 digital input module provides high-voltage signal acquisition for S800 I/O systems. This 8-channel module supports both 230V AC and DC inputs with individual channel isolation and advanced voltage supervision capabilities.

Key Technical Specifications

• Brand: ABB
• Model: DI821
• Article Number: 3BSE008550R1
• Product Type: Digital Input Module
• Signal Specification: 230V AC / 220V DC
• Channel Count: 8 channels
• Isolation: Individual channel isolation

Electrical Specifications - AC Inputs

• Voltage Range: 164-264 V AC
• Input Current: 11 mA at 230V AC
• Logic "0" Level: 0-50 V AC
• Logic "1" Level: 164-264 V AC
• Input Impedance: 21 kΩ
• Frequency Range: 47-63 Hz

Electrical Specifications - DC Inputs

• Voltage Range: 175-275 V DC
• Input Current: 1.6 mA at 220V DC
• Logic "0" Level: 0-40 V DC
• Logic "1" Level: 175-275 V DC
• Input Impedance: 134 kΩ

Voltage Supervision System

• Supervision Channels: Channel 1 and Channel 8
• Coverage Area: Channel 1 monitors channels 2-4
• Coverage Area: Channel 8 monitors channels 5-7
• Error Indication: Warning LED activates on voltage loss
• Communication: Error signals readable via ModuleBus

Performance Features

• Digital Filters: 2, 4, 8, 16 ms selectable
• Analog Filter: 6 ms fixed delay
• On/Off Delay: 5/28 ms analog filter timing
• Dielectric Test: 2000 V AC withstand voltage
• Power Dissipation: 2.8 W typical

Installation & Wiring

• Cable Length AC: 200 meters maximum
• Cable Length DC: 600 meters maximum
• Current Limiting: MTU-controlled protection
• Protection Class: IP20 according to IEC 60529

Diagnostics & Indicators

• Status LEDs: Fault, Run, Warning indicators
• Channel LEDs: Individual status for all 8 channels
• Error Detection: Module Error, Module Warning, Channel Error
• Voltage Monitoring: Real-time process voltage supervision

Physical Specifications

• Width: 45 mm
• Depth: 102 mm (111 mm with connector)
• Height: 119 mm
• Weight: 0.18 kg
• Mechanics: S800 form factor

Compatibility & Certifications

• Compatible MTUs: TU811, TU813, TU831, TU839, TU851
• Keying Code: AC
• Marine Certificates: ABS, BV, DNV, LR
• RoHS Compliance: DIRECTIVE/2011/65/EU
• Operating Temperature: 0 to +55 °C

Frequently Asked Questions

• How does the voltage supervision work?
  Channel 1 supervises channels 2-4 and Channel 8 supervises channels 5-7, activating warnings on voltage loss.
• What voltage ranges are supported?
  The module handles 164-264V AC and 175-275V DC inputs with individual channel isolation.
• What are the module dimensions?
  This compact module measures 45×102×119 mm and weighs 0.18 kg for efficient installation.