ABB DSAO110 57120001-AT/1 – High-Density Digital Output Module for Industrial Automation

If you’re upgrading or maintaining an ABB AC 800M control system, the DSAO110 module tends to come up pretty often—especially when you need reliable, high-density digital output in a compact footprint. From what I’ve seen across power plants and process facilities, this module fits neatly into distributed I/O setups where uptime and signal integrity matter.

One thing I appreciate is how it handles dry contact outputs with solid isolation—useful in environments where ground loops or voltage spikes could mess with sensitive equipment. It’s not flashy, but in many cases, that’s exactly what engineers want: something that works without drawing attention.

Key Features

• 16-channel digital output – Provides dry contact relay outputs, suitable for switching low-power signals or interlocking with external systems.
• Galvanic isolation – Each channel group is isolated from the backplane, which typically reduces noise coupling in electrically noisy environments.
• Plug-in terminal block design – Simplifies field wiring and allows for hot-swap replacement in most configurations, minimizing downtime.
• Status indication per channel – LEDs give real-time feedback on output states, making troubleshooting faster during commissioning or maintenance.
• Compatible with AC 800M controllers – Integrates directly into the Modbus-enabled I/O architecture via the Profibus DP-V1 interface.

Technical Specifications

Parameter	Specification
Brand / Model	ABB / DSAO110 (57120001-AT/1)
HS Code	85371090
Power Requirements	Supplied via controller bus (no auxiliary supply needed)
Dimensions (H × W × D)	Approx. 120 × 30 × 115 mm
Weight	~0.2 kg
Operating Temperature	0°C to +60°C (with derating above 45°C)
Signal Output Type	Dry contact relay outputs (form A), 16 channels
Communication Interface	PROFIBUS DP-V1 (via I/O bus connection)
Installation Method	DIN rail mount (standard 35 mm rail)

Application Fields

The DSAO110 shows up frequently in heavy industrial settings—think thermal power stations managing turbine interlocks, water treatment plants handling pump sequencing, or chemical processing lines where safety shutdowns rely on clean signal separation. It appears that its use is especially common in retrofit projects involving legacy ABB systems, where compatibility trumps cutting-edge features.

You might notice that some users pair it with DSUI110 modules to create mixed I/O racks, balancing cost and functionality without moving to newer platforms prematurely.

Advantages & Value

While not the newest module in ABB’s lineup, the DSAO110 remains a go-to for procurement teams managing long-term supportability. Its value isn’t in speed or smart diagnostics—it’s in availability and backward compatibility. In many cases, replacing entire racks just to eliminate one obsolete part isn’t practical, so sourcing genuine used or surplus DSAO110s can save weeks of engineering time.

From my experience, clients who maintain spare stocks of these modules typically report fewer unplanned outages during emergency replacements. And since firmware updates aren’t required for hardware swaps, integration is usually plug-and-play within existing logic frameworks.

Installation & Maintenance

Install in standard IP20-rated control cabinets with adequate ventilation—especially if operating near 60°C. Avoid sharing DIN rails with high-power drives unless shielded partitions are used. Wiring should follow ABB’s recommended practices: twisted-pair cables for longer runs, proper grounding at one end only, and labeling both module and terminal block.

Routine checks include verifying LED status under load and inspecting screw terminals for loosening due to thermal cycling. No scheduled calibration is needed—the contacts are passive—but if the module sits unused for over a year, a quick functional test before deployment seems wise.

Quality & Certifications

This module complies with CE, UL, and RoHS standards, reflecting ABB’s typical adherence to global industrial requirements. All units we handle are visually inspected, tested for continuity and isolation resistance, and verified against known good reference systems.

The warranty period is 365 days, covering defects in materials and workmanship. We don’t cover damage from incorrect installation or environmental exposure beyond rated specs, but technical support is available to help rule out user-side issues.

Order Placement & Delivery

For in-stock units, delivery typically takes about one week. If not immediately available, lead time won’t exceed four weeks. We ship via FedEx, UPS, or DHL depending on destination and urgency.

Payment terms are 50% advance, with the balance due before shipment. Full prepayment applies for first-time buyers or custom requests.