Description
Key Technical Specifications
- Model Number: DASO110 (P/N: 57120001-AT1)
- Manufacturer: ABB
- Output Channels: 4 independent, fully isolated channels
- Output Ranges: Configurable per channel – 4-20mA DC, 0-20mA DC, 0-10V DC
- Resolution: 16 bits (0.003125% of full scale)
- Accuracy: ±0.05% of full scale (25°C); ±0.1% over operating temperature range
- Output Load Capacity: 600Ω max (current outputs); 10kΩ min (voltage outputs)
- Isolation: 1kV AC (channel-to-channel), 2kV AC (output to backplane/ground)
- Operating Temperature: -25°C to 70°C (-13°F to 158°F)
- Power Supply: 24V DC ±10% (19.2-28.8V DC), 4W max power consumption
- Response Time: ≤1ms (step change from 0% to 100% full scale)
- Protection Rating: IP20 (module), IP54 when installed in ABB AC 800M cabinet
- Certifications: IEC 61131-2, UL 508C, CE, ATEX Zone 2, IECEx
ABB DASO110 57120001-AT1
Field Application & Problem Solved
In process industries—refineries, chemical plants, power generation—the costliest issue with analog output modules is signal interference and drift, especially in high-EMI environments. Legacy modules often fail to isolate channels, leading to cross-talk between control loops, or lose precision under temperature swings. I witnessed this at a Louisiana refinery in 2021: a non-isolated AO module controlling a reactor’s feed valve picked up noise from nearby VFDs, causing the valve to oscillate by ±3%. This resulted in off-spec diesel and a $85k production loss. The DASO110 57120001-AT1 fixes this with 1kV channel isolation and 16-bit precision, eliminating interference and keeping drift within actionable limits.
You’ll find this module in three high-stakes scenarios: regulating flow control valves in catalytic crackers (where ±0.05% accuracy maintains product quality), sending speed reference signals to boiler feed pump VFDs in power plants, and controlling pH dosing pumps in pharmaceutical batch processes (where regulatory compliance demands tight tolerances). At a Texas chemical plant retrofit in 2023, we replaced 20 legacy AO modules with DASO110s—cutting control loop variability by 60% and eliminating all EMI-related valve oscillations.
Its core value is reliability in harsh conditions. Unlike budget modules that degrade above 55°C, the DASO110 operates seamlessly up to 70°C—critical for boiler rooms or outdoor cabinets. The 600Ω load capacity handles long cable runs (up to 400m with 18AWG wire) without signal loss, a common pain point in large facilities. For 24/7 operations, this means fewer unplanned shutdowns and less time troubleshooting “ghost” signal issues that plague lesser modules.
Installation & Maintenance Pitfalls (Expert Tips)
Overlooking Load Resistance Limits:
Rookies frequently connect loads exceeding 600Ω to the 4-20mA outputs, causing signal clipping. A Wyoming gas plant connected a 1kΩ actuator directly to the DASO110—resulting in a max output of 14mA instead of 20mA, leaving the valve undersized. Calculate total loop resistance (cable + actuator + any inline devices) before wiring. For runs over 200m, use 16AWG cable to keep resistance under 400Ω, or add a signal booster for loads beyond 600Ω.
Improper Shield Grounding Causes EMI:
Even with built-in isolation, dual grounding of shielded cables creates ground loops. A Pennsylvania power plant grounded the cable shield at both the module and valve ends—introducing 50Hz noise that made the feed pump VFD fluctuate. Ground the shield only at the module end (control cabinet side) and leave the field end floating. Use twisted-pair shielded cable (ABB part 3BSE036402R1) for all outputs to reject EMI from motors or power cables.
Skipping Calibration After Power Spikes:
Voltage transients from grid faults or equipment startups can corrupt calibration data. A Michigan paper mill learned this the hard way after a lightning strike—two DASO110 channels drifted by 0.2%, leading to over-saturating a bleaching tank. After any power interruption or transient event, inject 4mA (0%), 12mA (50%), and 20mA (100%) test signals and verify outputs with a precision multimeter (±0.01% accuracy). Schedule quarterly calibrations for critical loops (e.g., reactor pressure control) to maintain compliance.
ABB DASO110 57120001-AT1
Technical Deep Dive & Overview
The ABB DASO110 57120001-AT1 is a rugged, precision analog output module engineered to translate digital setpoints from AC 800M controllers into reliable analog commands for field devices. At its core, each channel features a 16-bit DAC (digital-to-analog converter) paired with a temperature-compensated voltage reference, ensuring consistent accuracy across its wide operating range. Channel-to-channel isolation is achieved via dedicated optocouplers and isolated power rails, preventing cross-talk and protecting the module from voltage transients common in industrial environments.
A on-board microprocessor manages each channel independently, allowing per-channel configuration of output ranges without hardware modifications. When the AC 800M sends a digital value, the DAC converts it to the selected analog signal (e.g., 12mA for 50% of 4-20mA range) with a response time under 1ms—fast enough for dynamic processes like batch mixing or pressure control. The module communicates with the controller via the AC 800M’s native backplane bus, minimizing latency and CPU overhead.
What sets it apart is its industrial-grade durability: the aluminum chassis dissipates heat efficiently, and the module is tested to withstand vibration (1g peak, 10-500Hz) and ESD (2kV contact, 8kV air)—critical for refineries and mills. Unlike consumer-grade alternatives, it’s built to operate in harsh conditions without performance degradation. It’s not just a signal converter; it’s a reliable link between the control room and the field, designed to perform in the environments that break lesser modules.
