Product Core Brief

• Model: DSAO110 57120001-AT/1
• Brand: ABB
• Series: Advant OCS / S100 I/O
• Core Function: 4-channel isolated analog output module converting controller digital commands to standard current/voltage signals for field actuators.
• Product Type: Analog Output (AO) Module
• Key Specs: 4 isolated channels | 0–20 mA / 4–20 mA / 0–10 V | 12-bit resolution
• Condition: New Original / New Surplus / Tested Used

Key Technical Specifications

• Channels: 4 independent analog output channels
• Output Signals: 0–20 mA, 4–20 mA, 0–10 V (channel-configurable)
• Resolution: 12-bit D/A conversion
• Isolation: Channel-to-channel and channel-to-ground isolation
• System Compatibility: ABB Advant OCS / S100 I/O (Advant Controller 400 series)
• Part Number: 57120001-AT/1 (DSAO110)
• Diagnostics: Front-panel LED status indicators for power and per-channel fault
• Mounting: S100 I/O subrack / cardfile
• Replacement Note: DSAO120A + DSTA171 may replace DSAO110 + DSTA160 (rewiring required)

Product Introduction (No Fluff)

This is an ABB Advant OCS / S100 I/O analog output module that converts digital control commands into standard field signals for control valves, VFDs, dampers, and other final control elements. With four isolated channels, it supports mixed current and voltage outputs from a single card, simplifying wiring in legacy Advant systems.

For plants running Advant OCS or S100 I/O racks, this module is a common replacement when an existing AO card develops channel drift, short-circuit faults, or fails diagnostics. It slots directly into the configured S100 position and restores analog output capability without requiring a full rack overhaul.

QA & Testing SOP (Dynamic & Transparent)

Analog output cards fail in predictable ways: one channel stuck high, ground-loop noise, or calibration drift. We test accordingly.

• Inbound authenticity check: Verify 57120001-AT/1 labeling, ABB part markings, PCB revision, connector condition, and absence of corrosion or rework.
• Physical inspection: Check edge connector pins, card guides, terminal block interface, and LED indicators for damage.
• ESD-safe handling: Stored in anti-static bags with humidity control; handled at ESD-safe workstations.
• Power-up and diagnostics: Verify board power-up sequence and LED status on an S100 test setup where available.
• Output calibration check: Each channel is tested across its configured range (e.g., 4–20 mA or 0–10 V) using a calibrated multimeter or process calibrator to confirm linearity, offset, and absence of stuck channels. Open-load and short-circuit diagnostics are verified per module behavior.

If a full OEM Advant rack is not available for functional testing, we disclose it clearly rather than claiming unverified results.

Installation Pitfalls & Guide (Engineer to Engineer)

❗ Do not substitute DSAO110 with DSAO120/DSAO130 without rewiring. DSAO120A + DSTA171 can replace DSAO110 + DSTA160, but the termination and wiring change. Dropping in a different AO card without updating the connection unit will cause miswiring.

❗ Verify channel signal type configuration. This module supports 0–20 mA, 4–20 mA, and 0–10 V outputs. If the engineering station configures a channel as 4–20 mA but the field device expects 0–10 V, the actuator will not respond correctly.

❗ Check for ground loops on analog outputs. Even with channel isolation, improper shield grounding at both the cabinet and field device can introduce noise or offset errors. Ground shields at one end unless the system design specifies otherwise.

❗ Mind the backplane slot configuration. S100 I/O slots must be configured for the correct module type. Inserting an AO card into a slot configured for AI or DI will trigger system diagnostics faults.

Replacement steps:

1. Pre-install: Confirm part number, slot ID, channel configuration, and ESD precautions.
2. Removal: Follow site SOP for S100 I/O replacement. Advant S100 supports module exchange in many configurations, but confirm with the engineering station before pulling a live card.
3. Install: Seat the module firmly into the cardfile, verify connector alignment, and secure retaining hardware.
4. Power-on test: Check LED status, force each output channel from the engineering station, and verify field device response with a multimeter.

Technical FAQ

Is DSAO110 still available?
This is a legacy Advant OCS / S100 I/O module. Availability depends on surplus and remaining inventory. Confirm current stock before planning multi-unit replacements.

Can I replace DSAO110 with DSAO120A?
Not directly. DSAO120A + DSTA171 can replace DSAO110 + DSTA160, but the termination unit and field wiring must be updated. Do not swap them one-for-one without verifying the connection unit.

Does it support hot-swap?
ABB Advant S100 I/O supports module exchange during operation in many configurations. However, actual hot-swap safety depends on slot type, system redundancy, and plant procedures. Always verify with the engineering station before removing a live AO card, since a stuck output can drive a valve or VFD unexpectedly.

What warranty do you offer?
Warranty terms depend on condition: new original, new surplus, or tested used. We provide clear condition labeling and DOA coverage for tested units. Specific warranty length should be confirmed at checkout.

How do I confirm the correct replacement?
Send the rack type, slot number, existing module label, and a photo of the front plate and connection unit. We will verify whether 57120001-AT/1 matches your slot configuration and wiring before shipment.