Product Core Brief

• Model: DSAO120 57120001-EY
• Brand: ABB
• Series: Advant OCS / S100 I/O
• Core Function: Converts controller digital values into analog voltage/current signals for actuators, control valves, and field devices.
• Product Type: Analog Output Module
• Key Specs: 8 channels | ±10 V / ±20 mA | 12-bit resolution | galvanic isolation
• Condition: New Original / New Surplus

Key Technical Specifications

• Output channels: 8 analog outputs
• Output range: ±10 V, ±20 mA
• Resolution: 12-bit + sign
• Isolation: Galvanically isolated outputs
• Accuracy: approx. 0.05%
• Supply voltage: 24 V DC
• Operating temperature: -20 °C to +60 °C
• Storage temperature: -40 °C to +85 °C
• Interface: S100 I/O bus interface
• Mechanical dimensions: approx. 324 × 225 × 22.5 mm
• Net weight: approx. 0.29 kg

Product Introduction (No Fluff)

This is an 8-channel analog output module for the ABB Advant OCS / S100 I/O platform. It drives ±10 V and ±20 mA signals to control valves, actuators, recorders, and other field devices that accept analog setpoints from the controller.

The key advantage is controlled, isolated output across multiple channels. With 12-bit resolution and galvanic isolation, it helps maintain signal integrity when driving mixed loads from a single rack. For plants running legacy ABB systems, this unit is a practical replacement when original stock is hard to source.

QA & Testing SOP (Dynamic & Transparent)

We verify surplus AO modules before dispatch. This is not a factory calibration.

1. Incoming inspection — Confirm part number 57120001-EY, check for burnt components, corrosion, damaged connectors, and label consistency.
2. Bus and terminal check — Inspect S100 I/O contacts and output terminal areas for bent pins, oxidation, or mechanical damage.
3. Power-up test — Apply 24 V DC and verify normal LED behavior, absence of overheating, and no immediate fault indication.
4. Output verification — Where test equipment allows, command known digital values and measure output voltage/current with a calibrated multimeter or load bank. Check for channel drift, saturation, and open-load behavior.
5. Packing — Place in anti-static packaging with shock protection; provide actual-unit photos when requested.

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Voltage vs. current wiring is not interchangeable. ±10 V and ±20 mA outputs require different terminal configurations and load impedances. Wiring a voltage output into a current loop, or vice versa, will give incorrect readings or trip diagnostics.

❗ Check the safe state before replacement. AO modules drive live field devices. If the module fails, outputs may go to zero, hold last value, or move to a configured fail-safe position. Confirm valve behavior and process safety before pulling the card.

❗ Do not assume DSAO120 and DSAO120A are drop-in identical. Suffix and part-number changes can affect resolution, firmware, channel mapping, or configuration parameters. Always cross-check against your system hardware list.

❗ Ground loops can corrupt analog outputs. Even with galvanic isolation, poor shielding or multiple ground references can introduce noise. Keep analog cables away from VFD outputs and high-current feeders.

Replacement steps

1. Pre-install: Confirm model, slot position, output configuration, and back up the controller project.
2. Removal: Place affected loops in manual or safe state, disconnect field wiring, release the module, and withdraw it from the rack.
3. Install: Seat the new module firmly, reconnect terminals, and verify voltage/current wiring per channel.
4. Power-on test: Restore power, check diagnostics, and step each output through known values while measuring at the terminal block.

Technical FAQ

Is this an OEM genuine ABB part?
We supply new original and new surplus stock depending on availability. If sealed original packaging is required, confirm before ordering.

Can DSAO120 replace DSAO120A or other AO modules?
Not automatically. DSAO120 and DSAO120A may differ in resolution, configuration, or system behavior. Verify against your ABB hardware list and project documentation before substitution.

What is the warranty?
Warranty depends on condition and stock type. New surplus units typically carry shorter coverage than new original sealed stock. Confirm before purchase.

Do you provide calibration certificates?
No. This is a replacement I/O module, not a calibrated instrument. If formal calibration is required, arrange it after installation.

Is it in stock and ready to ship?
Inventory changes daily. Send the required quantity and destination, and we will confirm availability, lead time, and shipping options.