Product Core Brief

• Model: DSAO120A 3BSE018293R1
• Brand: ABB
• Series: Advant OCS / S100 I/O
• Core Function: 8-channel isolated analog output module converting controller digital values to ±10 V / ±20 mA signals for final control elements.
• Product Type: Analog Output (AO) Module
• Key Specs: 8 isolated channels | ±10 V / ±20 mA | 12-bit + sign resolution
• Condition: New Original / New Surplus / Tested Used

Key Technical Specifications

• Channels: 8 independent analog output channels
• Output Signals: ±10 V / ±20 mA, channel-configurable
• Resolution: 12-bit + sign D/A conversion
• Isolation: Electrically isolated outputs
• System Compatibility: ABB Advant OCS / S100 I/O (Advant Controller 400 series)
• Part Number: 3BSE018293R1 (DSAO120A)
• Diagnostics: Front-panel LED indicators and system-level diagnostics
• Mounting: S100 I/O subrack / cardfile with connection unit
• Hot-Swap: Supported for S100 I/O analog boards per system configuration
• Dimensions: 324 × 234 × 27 mm (L × W × H)
• Weight: 0.372 kg
• RoHS: Exempt under 2011/65/EU Article 2(4)

 

Product Introduction (No Fluff)

This is an ABB Advant OCS / S100 I/O analog output module that drives control valves, VFDs, dampers, and other field actuators from eight isolated channels. Each channel can be configured for ±10 V or ±20 mA, allowing mixed signal types from a single card in legacy Advant systems.

For plants running Advant OCS or S100 racks, this unit is a common replacement when an existing AO card develops channel drift, output saturation, or fails diagnostics. It slots 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 at rail, ground-loop noise, or calibration drift. We test accordingly.

• Inbound authenticity check: Verify 3BSE018293R1 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 or bent contacts.
• 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., ±10 V or ±20 mA) 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 confuse DSAO120A with DSAO110 or DSAO130. DSAO110 is 4-channel; DSAO130 is 16-channel 0–20 mA. DSAO120A is 8-channel ±10 V / ±20 mA. Wrong substitution will cause wiring mismatches and incorrect field signals.

❗ Verify channel signal type configuration. Each channel must match the field device requirement (±10 V vs. ±20 mA). A valve positioner expecting 4–20 mA will not respond correctly if the channel is configured for ±10 V.

❗ 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 in the engineering station. 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 DSAO120A 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 one-for-one. DSAO110 is a 4-channel AO module; DSAO120A is 8-channel with different signal ranges (±10 V / ±20 mA). Slot configuration, wiring, and engineering station setup must all be updated.

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 3BSE018293R1 matches your slot configuration and wiring before shipment.