Description

ABB DSAI146 3BSE007949R1

I. Basic Information

Model: DSAI146

Material Code: 3BSE007949R1

Brand: ABB

Applicable System: ABB Advant Master, Advant OCS, System 800xA automation platform, belonging to S100 series rack-mounted I/O hardware. It can be installed in local racks or remote I/O stations via MasterFieldbus fieldbus, mainly designed for high-precision acquisition of Pt100 RTD temperature signals, as well as standard industrial current and voltage analog signals.

Product Type: Rack-mounted high-density isolated analog input board with 31 channels. It integrates 16-bit high-precision ADC, multi-stage EMI filter, hierarchical galvanic isolation, backplane parallel bus communication and channel fault diagnosis circuits, supporting 3-wire Pt100, 4~20mA, ±10V and other analog signals, serving as a dedicated I/O module for centralized collection of massive temperature measuring points in process industries.

Product Positioning

DSAI146 3BSE007949R1 is a high-density analog acquisition unit of ABB classic S100 series. It is widely used for collecting Pt100 temperature sensor signals from boiler tube walls, heating furnaces, pipelines and motor windings, as well as analog signals from pressure, liquid level and flow transmitters. Adopting hierarchical isolation design (1500VAC between channel and backplane, 250VAC between channels), it effectively eliminates ground loop, inverter harmonic and electrostatic surge interference to avoid signal distortion and drift. With 16-bit high-resolution ADC, the temperature measurement accuracy reaches ±0.1℃, and it supports HART protocol expansion to read parameter data of smart transmitters. It greatly saves cabinet slot resources and is widely applied in measuring point expansion, faulty I/O board replacement and temperature monitoring system renovation of legacy Advant DCS systems in thermal power, petrochemical, metallurgy, oil & gas and paper industries.

Hardware Architecture

31-channel Multi-type Compatible Analog Input Unit: 31 independent acquisition channels configurable for 3-wire Pt100, 4~20mA, 0~20mA, ±5V, ±10V signals. Built-in constant current excitation source for RTD measurement and RC low-pass filter to suppress high-frequency electromagnetic noise.
16-bit High-precision ADC Conversion Unit: Multi-channel synchronous sampling chip with 10ms per channel sampling time, total full-channel scanning cycle ≤160ms. Voltage/current accuracy ±0.05%FS, Pt100 accuracy ±0.1℃, with built-in lead resistance compensation algorithm to eliminate temperature measurement error caused by long wiring.
Hierarchical Isolation & Hardware Protection Unit: 1500VAC isolation between channel and backplane, 250VAC inter-channel isolation. Each channel is equipped with overvoltage, overcurrent, reverse polarity and surge protection; single-channel faults will not spread to other measuring points.
Advant Parallel Backplane Bus Interaction Unit: Dedicated S100 parallel I/O backplane bus uploads process values and fault codes cyclically, receives configuration parameters including signal type, range and filter time. HART communication can be expanded via SD822/SD823 modules for smart instrument data reading.
Power-on Self-test & Hot-swappable Rack Installation Unit: Equipped with power and communication LED indicators for automatic full-loop self-inspection after power-on. Standard single-slot European rack structure with double-sided gold-plated fingers supports hot swapping and dense cabinet layout.

Mounting Specifications

Control Power Supply: DC 24V (21.6V~28.8V), typical power consumption ＜5W

Channel Configuration: 31 isolated analog input channels

Supported Signals: 3-wire Pt100, 4~20mA, 0~20mA, ±5VDC, ±10VDC

ADC Resolution: 16-bit (with sign bit)

Sampling Speed: 10ms per channel, full scanning cycle ≤160ms

Measurement Accuracy: ±0.05%FS for voltage/current; ±0.1℃ for Pt100

Mounting: Single-slot installation on standard S100 rack, hot-swappable

Overall Dimension: 234mm(W) × 324mm(H) × 22.5mm(D)

Net Weight: 0.40kg

Protection Class: IP20, installed in sealed constant-temperature dust-proof industrial control cabinet

Supporting Equipment: Advant redundant controller, S100 I/O rack, shielded analog cable, 24VDC power supply, channel fuse, SD822 HART module

Commissioning Tools: ABB Advant Control Builder, process calibrator, RTD simulator, insulation tester, anti-static wristband

Supporting System

Supporting Hardware

Advant Controller410/450 redundant controller, S100 series I/O modules, MasterFieldbus shielded cable, signal lightning protection module, Pt100 RTD, 2-wire transmitters.

Commissioning Tools

ABB Advant configuration software, multi-function process calibrator, hipot tester, HART handheld communicator.

Upper-level System

800xA automation platform, power plant DCS/SIS, industrial SCADA for real-time parameter monitoring, over-limit alarm and historical data archiving.

Typical Application Industries

Thermal power plant boiler and turbine temperature monitoring system, petrochemical reactor temperature & pressure acquisition, metallurgical furnace temperature control, oil & gas pipeline station parameter monitoring, paper and building material production line thermal process automation.

Product Features

31-channel High-density Multi-signal Integration: Centralized collection of RTD temperature and conventional transmitter analog signals reduces cabinet hardware quantity, wiring workload and system failure rate, ideal for large-scale temperature measuring point deployment.
Dual-layer Isolation & 16-bit High Precision: Hierarchical galvanic isolation plus lead resistance compensation effectively eliminates long-distance wiring signal drift and temperature deviation, ensuring stable measurement of critical process parameters under strong industrial electromagnetic interference.
HART Protocol Expansion for Smart Instrument Management: Compatible with dedicated communication modules to remotely access smart transmitter device information, fault logs and calibration data, realizing online equipment diagnosis and maintenance.
Fine-grained Channel-level Fault Diagnosis: Automatically identify wire break, short-circuit, over-range and wrong wiring faults, upload fault location and type to upper system for rapid troubleshooting.
Wide-temperature Industrial EMC Design: Operating temperature range -40℃~+70℃, compliant with EN 61000 standards, MTBF ≥150000 hours, with optional Ex Zone2 explosion-proof certification for hazardous chemical areas.
Full Backward Compatibility for In-situ Replacement: Pin-to-pin compatible with S100 rack hardware, faulty legacy modules can be directly replaced without large modification to existing configuration and field wiring to shorten maintenance downtime.

DSAI146 3BSE007949R1.png

II. Technical Specifications

2.1 Electrical Parameters

Model: DSAI146, Material Code: 3BSE007949R1

Channel Configuration: 31 hierarchically isolated analog input channels

Supported Signals: 3-wire Pt100, 4~20mA, 0~20mA, ±5V, ±10VDC

ADC Resolution: 16-bit (signed)

Accuracy: ±0.05%FS @25℃ (voltage/current); ±0.1℃ (Pt100)

Sampling Cycle: 10ms/channel, full scan ≤160ms

Dielectric Withstand Voltage: 1500VAC (channel to backplane), 250VAC (inter-channel)

Power Supply: DC24V ±20%, power consumption ＜5W

Bus Type: S100 dedicated parallel backplane bus, HART expandable

Protection Functions: Per-channel overvoltage, overcurrent, reverse polarity, surge suppression, wire break & over-range fault latch protection

2.2 Mechanical Parameters

Mounting: Vertical snap installation on 35mm standard European rack, hot-swappable

Dimension: 234mm × 324mm × 22.5mm

Net Weight: 0.40kg

Interfaces: Double-sided gold-plated bus fingers, front power & communication indicators

Cooling Mode: Natural convection air cooling, fanless design

2.3 Environmental Specifications

Operating Temperature: -40℃ ~ +70℃ (wide-temperature explosion-proof version: -40℃~+85℃)

Storage & Transportation Temperature: -40℃ ~ +85℃

Humidity: 5%~95%RH, non-condensing, no corrosive or conductive dust

III. Key Features

High-precision Centralized Collection of Mass Industrial Temperature Points: Converts RTD and transmitter analog signals into digital process values for boiler over-temperature protection, closed-loop process regulation and equipment interlock safety control.
Software-configurable Multi-type Signal Adaptation: Supports mixed deployment of RTD, current and voltage measuring points in one module without hardware jumpers, adapting to centralized monitoring of various field sensors.
Automatic Lead Resistance Compensation for Long-distance Temperature Measurement: Eliminates temperature deviation caused by long field cables, avoiding manual cable resistance calibration work on site.
Remote Operation & Maintenance of HART Smart Instruments: Enables remote reading of instrument fault codes and calibration records to reduce field inspection workload.
Remote Fault Alarm & Accurate Channel Location: Real-time fault upload realizes early warning of abnormal measuring points and greatly shortens on-site troubleshooting cycle.
Retrofit & Spare Part Compatibility for Legacy DCS Systems: Perfect for large-scale temperature measuring point expansion and in-situ replacement of aging AI modules, maximizing reuse of existing cabinet, wiring and configuration resources.

IV. Working Principle

After 24VDC power-on, the module completes self-test of power supply, backplane bus and all 31 input channels, then waits for configuration parameters from the main controller. Constant current excitation is provided for Pt100 sensors, and analog signals are filtered, isolated and converted to digital values via 16-bit ADC with lead resistance compensation. Process data and fault status are uploaded cyclically to the upper controller via backplane bus; HART digital data can be parsed with optional communication modules. Single-channel faults trigger local latch and remote alarm, and normal operation can be restored via remote reset after troubleshooting.

V. Application Scenarios

Mass Pt100 temperature acquisition for boiler and turbine control systems of thermal power plant Advant DCS.
Temperature, pressure and liquid level monitoring for reactors and distillation columns in petrochemical & coal chemical plants.
Furnace temperature and pipe network parameter collection for metallurgical hot rolling and sintering production lines.
Medium temperature and equipment protection monitoring for long-distance oil & gas pipeline compressor stations.
Technical renovation and capacity expansion projects of legacy Advant automation systems with DSAI146 module replacement.