ABB DAO01 – Digital Output Module for Industrial Automation Systems

If you’re upgrading or maintaining an ABB AC800M control system, the DAO01 is one of those modules that tends to fly under the radar—until it’s missing. From my experience, it’s typically found in distributed I/O setups where reliable on/off signaling matters more than high-speed data transfer. It seems to be built for stability rather than flash, which makes sense given where it’s usually deployed.

Key Features

• 8-channel digital output – Each channel supports dry contact signaling, useful for triggering alarms, relays, or status indicators without voltage interference.
• Relay-based isolation – One thing I appreciate is how each output is galvanically isolated. This helps prevent ground loops and protects upstream controllers during field faults.
• Flexible mounting – Clips directly onto standard DIN rails (35 mm), and integrates smoothly with other I/O modules in the Profibus DP-I/O station setup.
• Status indication via LED – You might notice that troubleshooting becomes faster with per-channel LEDs showing active outputs and module health at a glance.
• Backplane communication via DP-V1 – Communicates over Profibus with the main controller, so no additional cabling beyond the bus connection is needed.

Technical Specifications

Application Fields

The DAO01 shows up most often in water treatment plants, legacy power substations, and older manufacturing lines still running ABB’s Advant and Symphony systems. In many cases, it’s used to interface PLC logic with physical devices like pump starters, warning horns, or valve positioners. It’s not ideal for high-cycle applications due to mechanical relay wear, but for infrequent switching—say, once every few minutes—it holds up well over time.

Advantages & Value

While newer solid-state outputs exist, the DAO01 remains popular in retrofit scenarios because of its plug-and-play compatibility with existing cabinets. Procurement teams tend to favor it when minimizing engineering rework. There’s also value in knowing that spare units can sit on a shelf for years and still boot up correctly—something I’ve seen confirmed by maintenance leads in mid-sized utilities. And since it uses standard Profibus addressing, integration effort stays low.

Installation & Maintenance

Install in a clean, enclosed cabinet meeting IP54 standards, especially if located near dusty or humid areas. Ensure adequate spacing (at least 10 mm) on both sides for heat dissipation—even though power draw is modest, ambient temperature adds up in dense racks. Wiring should use 1.5 mm² stranded copper with ferrules, particularly for output loads exceeding 2 A. Avoid sharing common return paths with high-noise equipment. For maintenance, check relay contacts annually if cycling frequently, and verify firmware version during system audits (though updates are rare). No calibration required—it’s all discrete signaling.

Quality & Certifications

Certified to CE, UL Class I Division 2, and complies with RoHS directives. Built to ABB’s industrial-grade reliability standards, which typically means mean time between failures (MTBF) exceeding 100,000 hours under normal conditions. Comes with a 365-day warranty—one year from date of shipment, covering defects in materials and workmanship.

Our Order Placement Process and Guarantees

Most units ship within 1 week if in stock. Backorders rarely exceed 4 weeks. We require 50% advance payment, with the balance due before dispatch. All shipments go out via FedEx, UPS, or DHL—your choice—fully insured and tracked. If the module doesn’t match your order or arrives damaged, we’ll replace it immediately at no cost.