The DO814 is a high-performance digital output module designed specifically for the ABB Ability™ System 800xA® S800 I/O system. This module provides 16 channels of 24 V DC current sinking outputs, with a maximum continuous output current of 0.5 A per channel. It features excellent reliability, flexible configuration options, and comprehensive protection functions, making it suitable for various demanding environments such as industrial automation, process control, manufacturing, and energy management.
The module employs a group-isolated design, dividing the 16 channels into two independently electrically isolated groups (8 channels per group), each equipped with a separate process voltage supervision input. This effectively enhances system noise immunity and safety. The DO814 supports multiple Module Termination Unit (MTU) types, facilitating field wiring and integration. It is an ideal choice for building highly available and easily maintainable distributed control systems.
2. Product Features and Benefits
The DO814 is designed with the practical needs of industrial sites in mind, offering the following notable features and advantages:
2.1 High-Density Output and Flexible Grouping
16 Independent Output Channels: Meets the control requirements of multiple devices, saving installation space and cost.
2 Electrically Isolated Groups: 8 channels per group, with an inter-group isolation voltage of up to 500 V a.c., effectively preventing ground loop interference and faults caused by potential differences.
Process Voltage Supervision: Each group is equipped with a supervision input to monitor the supply voltage status in real time. Voltage anomalies are reported as errors via the ModuleBus.
2.2 Comprehensive Protection Mechanisms
Short-Circuit Protection: Provides protection against short circuits to ground and to 30 V, automatically limiting output current to protect field devices and the module itself.
Over-Temperature Protection: Automatically shuts down the output when the output stage temperature exceeds 150°C; automatically resumes when the temperature drops to approximately 140°C, ensuring stable operation.
Over-Voltage Protection: Wide input voltage range of 10–30 V d.c. (rated 12–32 V d.c.), accommodating voltage fluctuations.
Output Set as Predetermined (OSP) Function: Upon detection of a system error, outputs can be set to a predetermined safe state within 256 ms, 512 ms, or 1024 ms, enhancing system safety.
2.3 Easy Diagnosis and Maintenance
Per-Channel Status Indicator: All 16 channels are equipped with LEDs to display the output status in real time.
Module-Level Diagnostic Indicators: Include F (Fault), R (Run), W (Warning), O (OSP) for quick fault localization.
ModuleBus Communication Support: Module and channel status, voltage supervision alarms, and other information can be read via the bus, enabling remote diagnostics.
2.4 Strong Environmental Adaptability and Certifications
Wide Operating Temperature Range: Operating temperature 0 to +55°C, storage temperature -40 to +70°C, suitable for harsh industrial environments.
Multiple Certifications: Complies with CE, cULus, ATEX Zone 2, ABS/BV/DNV/LR Marine certifications, and meets RoHS/WEEE environmental directives.
High-Reliability Design: Conforms to electrical safety, mechanical, and EMC standards such as EN 61010-1, IEC 61131-2, EN 61000-6-2/4.
2.5 Compatibility and Expandability
Supports Multiple MTUs: Including TU810, TU812, TU814, TU830, TU833, and TU838, meeting different wiring and protection needs.
Long-Distance Transmission: Maximum field cable length up to 600 meters, suitable for distributed layouts.
Low Power Consumption Design: Typical power dissipation only 2.1 W, +5 V ModuleBus current consumption 80 mA, energy-efficient and high-performance.
3. Structure and Working Principle
The DO814 adopts a modular and isolated design. Its internal structure mainly includes the following parts:
Low-Side Switch: Each channel is equipped with a short-circuit and over-temperature protected MOSFET switch for reliable current sinking output.
EMC Protection Circuit: Includes filtering and transient suppression components to enhance electromagnetic interference immunity.
Inductive Load Suppression: Built-in freewheeling diode or RC network to protect the switch from back EMF surges.
Optical Isolation: Optical isolation is used between each group of channels and the internal logic circuit to ensure signal purity and electrical safety.
Status Indicator LED: Independent LED per channel for intuitive output status display.
Supervision Input Circuit: Monitors the group supply voltage in real time; triggers an alarm upon voltage loss.
The module communicates with the upper-level controller via the ModuleBus, receiving output commands and reporting status and fault information. When process voltage loss, output overcurrent, or over-temperature is detected, the module can automatically enter a protected state and set the outputs to predetermined safe values via the OSP function to prevent equipment misoperation.
4. Installation and Wiring
The DO814 must be used with a compatible Module Termination Unit (MTU). Different MTUs provide different wiring methods and protection functions:
4.1 Introduction to Supported MTU Types
TU830/TU833 Extended MTU: Supports three-wire connection without additional terminals, suitable for high-density installation.
TU810/TU814 Compact MTU: Provides terminals for 24 V power connection but requires external distribution of 24 V power supply to devices.
TU812 Compact MTU: Equipped with a D-Sub 25-pin (male) connector, suitable for prefabricated cable connections.
TU838 Extended MTU: Provides a fuse (max. 3 A) per two channels for enhanced process power protection.
4.2 Wiring Diagrams and Terminal Assignments
Please refer to Table 82 in the original document for the detailed wiring table. The following is a brief overview:
Power Input: Each group has independent +24 V d.c. (L1+/L2+) and 0 V (L1-/L2-) terminals.
Output Channels: Ch1–Ch8 belong to Group 1, Ch9–Ch16 belong to Group 2, each with corresponding power and return lines.
Supervision Input: Process voltage is connected to each group to monitor power supply status.
Specific wiring should refer to the terminal diagrams and instructions of the selected MTU and comply with relevant electrical installation standards.
5. Application Fields
Thanks to its high reliability, flexible configuration, and comprehensive protection, the DO814 is widely used in the following scenarios:
Process Automation: Controlling actuators such as valves, pumps, fans, and heaters.
Manufacturing: Production line equipment control, robot interfaces, conveyor control.
Energy Management: Power distribution system control, generator synchronization control, load switching.
Transportation: Port automation, rail transit signaling control.
Marine and Offshore Engineering: Compliant with marine certifications, suitable for ship control systems.
6. Ordering Information and Compatibility
Main Article Number: 3BUR001455R1 (latest version)
Compatible Systems: ABB Ability™ System 800xA®, S800 I/O Platform
MTU Keying Code: BE (ensures physical and electrical compatibility)
Related Accessories: Terminal units, power supply modules, bus adapters, etc., can be selected based on the actual configuration.
