3BSC690074R1 DO890 Digital Output Module: Technical Overview
The 3BSC690074R1 DO890 is a specialized digital output module designed for ABB Ability™ System
800xA®. It integrates intrinsic safety (Ex) protection directly on each channel, enabling safe
connection to process equipment in hazardous areas without external safety devices—ideal for
industries like oil and gas, chemical processing, and pharmaceutical manufacturing.
Core Features & Benefits
4 independent digital output channels, optimized as solenoid drivers for Ex-certified field devices.
Intrinsic safety certification, supporting direct interface with equipment in hazardous zones
(ATEX/IECEx Zone 2, cFMus C1 Div 2) and compatibility with Zone 0/1 devices via approved interfaces.
Full galvanic isolation: Channels are isolated from each other, the ModuleBus, and power supply to
prevent electrical interference and ensure system integrity.
Per-channel status and fault indicators, plus configurable open/short circuit detection for proactive
maintenance.
Compatible with ABB TU890 (Ex applications) and TU891 (non-Ex applications) Compact MTUs,
enabling two-wire connections to field devices without additional terminals.
Technical Specifications
Electrical Parameters
Signal Specification: 11 V DC, 40 mA nominal output current per channel.
Output Load Range: 100 – 5000 Ω (supports Ex-certified solenoid valves, alarm sounders, indicator lamps).
Current Limiting: Short-circuit proof with current-limited outputs; short-circuit detection limit < 20 Ω, open-circuit detection limit > 100 kΩ.
Isolation: Individually isolated channels (channel-to-channel and to circuit common ground); dielectric test voltage 500 V AC; rated insulation voltage 50 V.
Power Consumption: +5 V ModuleBus (typ. 80 mA, max. <150 mA); +24 V external (typ. 250 mA, max. <360 mA); power dissipation 4.4 W.
Environmental & Certification
Operating Temperature: 0 to +55 °C (+32 to +131 °F); 40 °C (104 °F) for vertical mounting in Compact MTU.
Storage Temperature: -40 to +70 °C (-40 to +158 °F).
Humidity: 5 to 95% non-condensing; Pollution Degree 2 (IEC 60664-1); Corrosion Protection ISA-
S71.04: G3.
Certifications: CE marked; Electrical safety (EN 61010-1, EN 61010-2-201); Marine certifications (ABS,
BV, DNV, LR); RoHS (DIRECTIVE/2011/65/EN) and WEEE (DIRECTIVE/2012/19/EU) compliant.
Mechanical Details
Dimensions: Width 45 mm (1.77”), Depth 102 mm (4.01”) (111 mm / 4.37” including connector),
Height 119 mm (4.7”).
Weight: 0.2 kg (0.44 lbs.).
Protection Class: IP20 (IEC 60529); Keying Code: AB.
Diagnostics & Supervision
Front-Panel LEDs: F (Fault), R (Run), W (Warning), O (OSP), and Channel 1-4 status indicators.
Fault Detection: Internal process supply monitoring; fault sense current < 4 mA; supervision status
indication intervals (256, 512, 1024 ms).
