DO820 ABB Digital Output Module(8-channel)

Description

DO820 ABB Digital Output Module(8-channel)

Product Dimensions：

Product Description (Detailed Explanation)

The DO820 acts as a galvanically isolated interface between the control system and the process. Unlike standard transistor outputs, the DO820 utilizes physical relays, allowing it to switch both AC and DC loads with higher current capacities.

• Isolation: It provides high-quality galvanic isolation between the internal system logic and the field wiring, protecting the controller from surges or faults on the field side.

• Modular Design: It plugs into a Module Termination Unit (MTU), such as the TU810, TU812, or TU814. The MTU contains the field wiring terminals, allowing the module to be replaced without disconnecting any cables.

• Indication: The front panel features LED indicators for “Run” (module status), “Fault,” and individual status LEDs for each of the 8 output channels.

Product Parameters (Technical Specifications)

 Product Advantages (Key Benefits)

• High Power Switching: Capable of directly switching 230 V AC loads up to 3 Amps, often eliminating the need for intermediate interposing relays.

• Flexibility: Because it uses dry relay contacts, it can handle a wide variety of load types, including mixed AC and DC voltages within the same module (across different groups).

• Hot-Swap Capability: Like most S800 modules, the DO820 can be “Hot-Swapped” (removed or inserted while the rack is powered), significantly reducing system downtime during maintenance.

• Robust Fault Protection: The mechanical nature of the relay provides a physical air gap when open, ensuring zero leakage current to the field device in the “OFF” state.

Precautions (Important Notes)

• Inductive Load Suppression: When switching inductive loads (solenoids, contactor coils), you must install external RC-snubbers (for AC) or flyback diodes (for DC) across the load. Failure to do so will cause arcing, drastically shortening the relay contact life.

• Current Limits: Pay close attention to the group current limits. While one channel can handle 3 A, the sum of four channels in one group should not exceed the specified rating (usually 12 A) to prevent overheating the MTU backplane.

• MTU Compatibility: Ensure you are using the correct Module Termination Unit. The TU810 is standard, but specialized MTUs may be required for specific voltage levels or redundant configurations.

• Mechanical Life: Relays have a finite mechanical lifespan (typically 100,000 to 1,000,000 cycles). Avoid using this module for high-frequency switching tasks (like PWM or rapid pulsing); use a transistor module like the DO810 instead for those cases.

 Product Applications (Typical Use Cases)

The DO820 is widely used in Distributed Control Systems (DCS) for:

• Motor Control Centers (MCC): Switching the coils of large motor starters or contactors.

• Valves and Dampers: Controlling the open/close solenoids for pneumatic or hydraulic actuators in oil and gas refineries.

• Lighting and Alarms: Driving industrial sirens, beacons, or plant-wide lighting systems.

• Power Distribution: Providing signals to trip or close circuit breakers in medium-voltage switchgear.

• Interfacing: Connecting the ABB AC 800M controller to third-party equipment that requires dry contact inputs.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Please make an inquiry for more models：