Description
Product Overview
The ABB DSAI146 3BSE007949R1 is an analog input unit for ABB’s S100 I/O family, used in compatible Advant OCS control systems. Its documented application is temperature measurement using 100-ohm platinum Pt100 resistance temperature detectors with three-wire connections. The unit accepts sensor measurements and makes the acquired values available to the control system for process monitoring, alarm handling, and control logic. With 31 measurement channels and a reference channel, it can support multiple temperature measurement points within a single I/O installation.
The DSAI146 is intended for a specific sensor arrangement rather than unrestricted analog input use. It should not be treated as a universal voltage or current input module. Sensor wiring, lead resistance compensation, channel assignment, and the system’s engineering configuration all affect measurement accuracy. ABB’s S100 I/O documentation lists the DSAI146 alongside other analog input boards, including modules intended for thermocouples and different sensor configurations. Selecting the correct board therefore requires matching the actual field sensor type and wiring method—not simply matching the physical size or product family.
For maintenance teams keeping older control systems in service, the ABB DSAI146 3BSE007949R1 can be a relevant replacement when the existing installation uses the same Pt100 three-wire measurement arrangement. Before ordering, compare the complete part number on the installed unit, verify the associated connection unit and cable, and confirm that the controller configuration supports the replacement. The S100 I/O manual identifies DSTA 145/145P connection units and DSTK 202/229 cables for DSAI146 applications. A matching board number alone does not confirm that all required connection hardware is included or that a supplied unit has passed functional testing.
Product Introduction
When a temperature reading becomes unstable, the fault may originate in the sensor, field wiring, termination hardware, or input unit. The ABB DSAI146 is designed for 31 Pt100 temperature measurement channels using three-wire sensor connections in compatible S100 I/O systems.
Before replacement, check sensor resistance, wiring continuity, channel configuration, and the associated termination components. These checks help distinguish an input-module fault from a field-side measurement problem.
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | ABB |
| Model | |
| Part Number | 3BSE007949R1 |
| Product Type | Analog input unit |
| I/O Family | S100 I/O |
| System Application | Supported ABB Advant OCS configurations |
| Measurement Channels | 31 |
| Reference Channel | 1 |
| Sensor Type | Pt100, 100-ohm platinum RTD |
| Sensor Wiring | Three-wire |
| Resolution | 12/13 bits plus sign |
| Connection Unit | DSTA 145 or DSTA 145P |
| Cable | DSTK 202 or DSTK 229 |
| Input Impedance | Verify against the applicable specification |
| Operating Temperature | Verify against the installed system’s technical documentation |
| Condition | Confirm stock status and test documentation |
The channel count, sensor type, resolution, and associated connection hardware are based on the available S100 I/O documentation. Confirm the exact manual revision before using the unit for precision temperature measurement.
DSAI146
Related Products
- DSAI130A — I/O analog input board for other supported analog measurement applications.
- DSAI133A — Related analog input board; confirm its intended sensor and signal type.
- DSAI155A — Analog input board associated with thermocouple measurement applications.
- DSTA145 — Connection unit identified for installations.
- DSTA145P — Alternative connection-unit version listed in the I/O manual.
- DSTK202 — Cable option for applications.
- DSTK229 — Related cable option listed for the .
- ABB Advant Controller 450 — Controller platform found in supported Advant OCS installations; system compatibility must be checked at the rack and configuration level.
These are related components or comparison references, not automatic substitutes. Confirm sensor compatibility, connection hardware, and the exact control-system configuration before selecting a replacement.
Frequently Asked Questions
Q1. What sensors does the ABB support?
The documented application is a 100-ohm platinum Pt100 RTD using a three-wire connection. Do not assume that it supports thermocouples or standard 4–20 mA transmitters; those applications require the appropriate input hardware.
Q2. How many temperature channels does the provide?
The I/O manual lists 31 measurement channels plus one reference channel. Confirm the channel mapping and reference-channel use in the applicable system documentation before configuring the module.
Q3. Can I replace with DSAI155A?
Not as a direct substitution without engineering review. The is documented for Pt100 RTD inputs, while the DSAI155A is associated with thermocouple measurement. Their sensor interfaces and wiring requirements differ.
Q4. Which connection unit and cable should I check?
The I/O manual lists DSTA145 or DSTA145P connection units and DSTK202 or DSTK229 cables for applications. Confirm the exact combination used in the existing cabinet and whether these components are included in the supplied package.
Q5. Can the be hot-swapped during operation?
Do not assume live replacement is permitted. Follow the approved maintenance procedure for the installed I/O system and assess the effect on affected temperature points, alarms, and control loops before removing the module.
Q6. How can I verify that a replacement unit is genuine and functional?
Check the identification label and part number, inspect the board and connectors, and request traceability information. If functional testing is claimed, ask for the test scope and results, including verification of input channels where available. A visual inspection alone cannot establish measurement accuracy.
Q7. Does a new-surplus include a warranty or factory-sealed packaging?
Neither should be assumed from the term new surplus. Confirm the unit’s actual condition, packaging, inspection or test history, warranty period, and return terms in writing before ordering.
