DO840 3BSE020838R1 ABB High-density leaky digital output module AC 800M System 800 A

Product Overview

ABB DO840 is a new generation of 16-channel digital output module in AC 800M distributed control system, featuring NPN transistor leakage (Sinking) output structure and tool-free spring terminal technology. Designed specifically for driving 24 V DC loads (such as solenoid valves, relays, solid-state relays, PLC inputs, etc.).

As a high-density upgraded version of the DO801/DO810 series, the DO840 significantly enhances wiring efficiency and diagnostic capabilities while maintaining high reliability. It is suitable for scenarios such as automotive manufacturing, packaging machinery, material handling, water treatment, and smart factories where there is a clear demand for rapid deployment and predictive maintenance.

Core features

16-channel high-density drain type output
Output type: 24V DC leakage type (Sinking)
Maximum load current: 0.5A per channel, total ≤ 4A per module
On-state voltage drop: < 1.0V @ 0.5A (low power design)
Spring terminal tool-free wiring
Push-in technology, supporting 0.14-2.5mm ² (26-12 AWG) wires
The wiring speed is increased by 50%, with anti-vibration and anti-loosening properties, making it suitable for mobile devices and harsh environments
Comprehensive protection and diagnosis
Each channel is equipped with short-circuit protection, overload detection and open-circuit status monitoring
Faults are automatically reported to the System 800xA, supporting channel-level LED or software status indication

Technical parameters

Installation and Usage instructions
Hardware installation
Insert the DO840 into the S800 I/O electronic rack (TB842A redundant base plate is recommended);
Connect to the CI854A (optical fiber) or CI801 (electrical) communication module via the ModuleBus cable;
Provide a 24V DC load power supply externally. The positive terminal is connected to the load, and the other end of the load is connected to the output terminal of DO840. The common terminal (M) of DO840 is grounded.
Software configuration
Add the DO840 device in Control Builder M v6.0+;
Name each channel (such as "Sorter_Valve_3_CMD");
Configurable fail-safe behavior (such as automatic shutdown in case of short circuit);
Enable the channel diagnosis function to achieve predictive maintenance;
Debugging and verification
The green LED on the front panel indicates that the module is operating normally.
If a certain channel is short-circuited, the current of that channel will be limited and a fault will be reported (red LED flashing or software alarm).
Loop testing can be performed by forcing the output through Control Builder M.

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