ABB 57120001-EY DSAO120 Analog Output Module

Overview

The DSAO120 (57120001-EY) is an 8-channel analog output module developed for ABB S800 I/O architectures and AC 800M controllers. It delivers stable, high-accuracy analog signals for direct control of field actuators, converters, and regulating devices in continuous and discrete process environments.

Designed for deterministic output performance, this module integrates precision DAC technology, per-channel isolation, and comprehensive diagnostics to ensure predictable behavior in electrically noisy and mission-critical installations.

Signal Performance and Output Capabilities

Each channel of DSAO120 (57120001-EY) operates independently and can be configured via system software for voltage or current output modes. The module supports both unipolar and bipolar ranges, allowing seamless adaptation to mixed field instrumentation without external signal conditioners.

The internal 12-bit digital-to-analog conversion provides fine output granularity, while factory-calibrated accuracy maintains output stability over temperature and load variations.

Electrical Specifications

• Number of channels: 8 isolated analog outputs

• Output signal types: Voltage or current, software selectable

• Voltage ranges: ±10 V

• Current ranges: 0–20 mA, 4–20 mA, ±20 mA

• Resolution: 12-bit including sign

• Absolute accuracy: ±0.05% of full scale

• Current output load: up to 600 Ω

• Voltage output load: ≥1 kΩ

• Module supply voltage: 12–24 VDC via S800 I/O bus

• Output ripple and noise: low-ripple precision DAC design

Isolation, Diagnostics, and Reliability

To protect both controller and field wiring, DSAO120 (57120001-EY) provides galvanic isolation between channels and internal logic. Continuous self-monitoring functions report channel status, wire break, and internal faults directly to the controller, simplifying commissioning and long-term maintenance.

The module is engineered to meet industrial EMC requirements and sustain stable operation in harsh electrical environments such as power generation and chemical processing units.

Mechanical and Environmental Data

• I/O platform: ABB S800 I/O mechanical format

• Mounting method: DIN-rail with S800 backplane connection

• Weight: 0.46 kg

• Operating temperature range: –25 °C to +60 °C

• Storage temperature range: –40 °C to +85 °C

• Enclosure and connector dimensions vary by terminal unit and front connector configuration

System Compatibility

• ABB AC 800M controllers

• ABB S800 I/O local and remote stations

• Compatible with redundant and non-redundant I/O configurations

Typical Use Cases

• Control valve positioning and modulation

• Speed reference output to VFDs and servo drives

• Analog command signals for process controllers

• Output signal generation in distributed control systems

• Closed-loop control applications requiring high output stability

FAQ

Can voltage and current outputs be mixed on the same module?

Yes. Each channel of DSAO120 (57120001-EY) is independently configurable, allowing voltage and current outputs to coexist on the same module.

Is external isolation required for sensitive field devices?

No. The module already incorporates galvanic isolation per channel, reducing the need for additional isolation hardware.

Is the module suitable for redundant control systems?

Yes. When installed in appropriate S800 I/O architectures, the module supports redundant controller configurations.