Email: jiedong@sxrszdh.com
Phone / Wechat：+86 15340683922Description
Product Introduction
The ABB DSAO120 is a 4-channel analog output module designed for the Advant OCS (Open Control System) and MasterPiece control platforms. This module provides 4 to 20 mA output signals for positioning valves, actuators, variable frequency drives, and other final control elements. The DSAO120 mounts in an S100 I/O rack and communicates with the controller via the S100 bus, a standard I/O interface used across ABB’s legacy control systems.
The Advant OCS and MasterPiece platforms were ABB’s flagship distributed control systems for process industries, with thousands of installations still in operation today in refining, chemical, pharmaceutical, and power generation facilities. The DSAO120 is part of the S100 I/O family, which was the standard I/O for these systems. As ABB has transitioned to newer platforms such as System 800xA, the S100 I/O product line has been discontinued. For facilities maintaining legacy Advant or MasterPiece systems, sourcing verified DSAO120 modules is essential for avoiding costly system migrations.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Product Type | Analog Output Module |
| Number of Channels | 4 channels |
| Output Signal | 4 to 20 mA |
| Resolution | 12 bits (0.025% of full scale) |
| Accuracy | ±0.1% of full scale at 25 °C |
| Output Load | 0 to 750 Ω |
| Update Rate | 50 ms per module (all channels) |
| Isolation | 1,500 V AC (channel to backplane) |
| Power Supply | 24 V DC from backplane and external loop power |
| Operating Temperature | 0 to 55 °C |
| Mounting | S100 I/O rack |
| Part Number | DSAO120 57120001-EY |
Key Selling Points & Differentiators
- Legacy System Support: Direct replacement for ABB Advant OCS and MasterPiece systems. No configuration changes or rack modifications required when replacing a failed unit with the same part number.
- S100 I/O Compatibility: Standard S100 I/O form factor compatible with all S100 racks and termination units. Drops into existing installations with no mechanical modifications.
- 4-Channel Density: Provides four analog outputs per module, balancing channel count with physical footprint. Suitable for applications requiring moderate analog output density.
- Proven Reliability: S100 I/O modules were built for 24/7 continuous operation in process environments. Gold-plated edge connectors and industrial-grade components ensure long service life.
- Authenticity Guarantee: Each unit undergoes visual inspection for ABB OEM markings, serial number traceability, and PCB integrity. We test every module on a live S100 I/O rack or Advant controller before shipping.
Frequently Asked Questions (FAQ)
Q: Which ABB control systems is the DSAO120 compatible with?
The DSAO120 is compatible with:
- Advant OCS (Open Control System) with S100 I/O
- MasterPiece (MP200, MP200/1) with S100 I/O
- MOD 300 with S100 I/O
It is not compatible with System 800xA S800 I/O, AC800M S800 I/O, or newer ABB platforms without a gateway or I/O migration kit.
Q: Is this module discontinued?
Yes. ABB has discontinued the Advant OCS platform and the S100 I/O product line. The DSAO120 is no longer in active production. Availability is limited to new surplus and tested used inventory. For Advant or MasterPiece systems still in operation, we recommend securing spares while stock remains available.
Q: What is the difference between the DSAO120 and the DSAO110?
The DSAO110 is an 8-channel analog output module with 4 to 20 mA outputs, while the DSAO120 is a 4-channel module. Both share similar electrical specifications and are compatible with the same S100 I/O racks. The DSAO120 is often used in applications where fewer channels are needed per module or where physical space in the rack is limited.
Q: Does this module require external loop power?
Yes. The DSAO120 outputs a 4 to 20 mA signal but does not provide loop power. Field devices require an external 24 V DC power supply connected at the field termination. The module controls the current loop but does not source the voltage. Verify your field wiring diagram to ensure proper loop power is available.
Q: Can I hot-swap the DSAO120 in a running system?
No. The S100 I/O backplane does not support hot-swap of I/O modules. The system must be powered down before removing or inserting a DSAO120. Attempting to remove or install a module with power applied can damage the module, the backplane, or the controller, and may cause process upsets.
Q: What is the maximum cable length for field wiring?
For 4 to 20 mA signals, the maximum recommended cable length is 600 meters (2,000 feet) when using shielded twisted-pair cable and proper grounding. For installations with high electrical noise, we recommend shorter runs or additional shielding. Follow ABB’s S100 I/O installation guidelines for specific applications.
Q: What testing do you perform before shipping?
We test every DSAO120 on a live S100 I/O rack with an Advant or MasterPiece controller. Our test procedure includes:
- Visual inspection for physical damage, corrosion, or previous repairs
- Edge connector cleaning and inspection
- Backplane communication verification
- Output channel testing across the 4 to 20 mA range with precision load and measurement
- Accuracy verification against expected values
- 24-hour continuous power-on soak test
A test report with channel measurements and test results is included with each shipment.
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