I/O modules

Overview

The ABB DO821 Digital Output Module is an 8-channel relay (NC) output module designed for use with the S800 I/O system. It supports both 230 V a.c./d.c. signals, with a maximum output voltage of 250 V a.c. and a continuous output current of 3 A per channel. Each output channel is individually isolated, offering enhanced reliability and safety in industrial applications. The module also features optical isolation barriers and output state indication LEDs for clear status monitoring.

Key Features

• 8 Channels for 230 V a.c./d.c. Relay (NC) Outputs
  Each channel supports 230 V a.c./d.c., with a maximum voltage range of 5–250 V a.c./d.c. and a current rating of 3 A per channel.
• Individually Isolated Channels
  Offers isolation between channels and the circuit common to ensure operational integrity and safety.
• Output Status Indicators
  Each channel is equipped with an Output State Indicator (OSP), providing real-time feedback on the output status.
• Relay Power Supervision
  Includes a 24/12 V Relay Power Converter Monitor to supervise relay power and activate warning signals if the relay power is disrupted.
• Error Detection and Indication
  In the event of an error, the module sets outputs to a predetermined state (OSP) and triggers appropriate status indicators (Fault (F), Run (R), Warning (W)).
• Maximum Field Cable Length of 600 meters (656 yards)
  Supports long-distance installations while ensuring reliable performance.

Detailed Specifications

General Information

• Signal Specification: 230 V a.c./d.c. (5-250 V a.c./d.c.), 3 A per channel
• Relay Type: Normally Closed (NC)
• Number of Channels: 8
• Isolation: Individually isolated, channel-to-channel and to circuit common
• Current Limiting: Can be limited by the MTU
• Power Dissipation: 2.9 W (typical)
• Current Consumption:
  • +5 V ModuleBus: 60 mA
  • +24 V ModuleBus: 140 mA
• Maximum Field Cable Length: 600 meters (656 yards)
• Rated Insulation Voltage: 250 V
• Dielectric Test Voltage: 2000 V a.c.

Environmental & Certification

• CE Mark: Yes
• Electrical Safety: EN 61010-1, UL 61010-1, EN 61010-2-201, UL 61010-2-201
• Hazardous Location: None
• Marine Certification: ABS, BV, DNV, LR
• Operating Temperature: 0 to +55°C (+32 to +131°F)
• Storage Temperature: -40 to +70°C (-40 to +158°F)
• Humidity: 5 to 95%, non-condensing
• Pollution Degree: Degree 2, IEC 60664-1
• Corrosion Protection: ISA-S71.04: G3
• Protection Class: IP20 (IEC 60529)

Mechanical Dimensions

• Width: 45 mm (1.77”)
• Depth: 102 mm (4.01”), 111 mm (4.37”) including connector
• Height: 119 mm (4.7”)
• Weight: 0.23 kg (0.5 lbs)

Compatibility & Installation

• Compatibility with MTUs: Compatible with various MTU modules, including TU811, TU813, TU831, TU836, TU837, and TU851.
• Keying Code: CA (for proper module insertion)

Applications

• Industrial Automation
  Ideal for controlling high-voltage industrial systems, ensuring safe relay operations in automation processes.
• Remote Signaling
  Suitable for long-distance field applications with a high level of field cable length.
• Process Control
  Works effectively within process control systems, offering reliable relay output for control and alarm functions.
• Machine Protection Systems
  Provides critical outputs for alarm signaling in machine protection and monitoring systems.

Details