ABB DSTC176 57310001-KT Bus Extension Terminator Unit

Product Description

The DSTC176 57310001-KT is a dedicated bus termination module engineered for legacy and extended control bus architectures within ABB distributed control systems. It is designed to provide the correct electrical end-of-line termination for extended bus segments, ensuring reliable signal transmission and long-term communication stability.

In large Advant OCS and MOD 300 installations, bus extensions are commonly used to connect remote I/O racks and expansion units over long distances. Without proper termination, signal reflections and impedance mismatches can degrade data integrity. The DSTC176 (57310001-KT) addresses this requirement by introducing a stable termination resistance and a controlled electrical interface at the end of the bus extension.

The module features a slim, lightweight mechanical design optimized for dense control cabinets, making it suitable for retrofit projects, system expansions, and maintenance replacement of aging DCS hardware.

Technical Specifications

General Information

• Model: DSTC176 (57310001-KT)

• Manufacturer: ABB

• Product Category: Control System Accessory

• Functional Role: Bus Extension Termination

• System Compatibility: Advant OCS, MOD 300, ABB legacy DCS platforms

Electrical Characteristics

• Rated Supply Voltage: 24 V DC

• Typical Current Consumption: Approximately 50 mA

• Nominal Termination Resistance: 50 Ω

• Supported Bus Capacity: Up to 128 signal channels

• Function: End-of-line impedance stabilization for extended bus segments

Mechanical Data

• Depth / Length: 255 mm

• Width: 115 mm

• Height: 20 mm

• Net Weight: 0.03 kg

• Installation Type: Control cabinet mounting

Environmental & Compliance

• RoHS Status: Not RoHS compliant

• WEEE Classification: Category 5 – Small Equipment

• Battery Content: None

• Intended Environment: Industrial control cabinets

• SCIP Reference: 860e0c89-6811-4249-aed8-557879f9f993

Functional Characteristics

• Provides precise electrical termination for extended bus lines

• Minimizes signal reflection and impedance mismatch

• Enhances communication reliability in large distributed I/O systems

• Supports high channel density without affecting bus timing

• Suitable for long-distance bus expansion in legacy ABB DCS systems

Typical Application Scenarios

• Termination of bus extensions in Advant OCS systems

• MOD 300 distributed control system expansions

• Stabilization of communication lines for remote I/O racks

• Replacement of obsolete or failed bus termination units in existing installations

FAQ

Q: Is the DSTC176 an active communication module?
A: No. The DSTC176 (57310001-KT) is a passive termination unit. It does not process control logic or data but ensures correct electrical conditions at the end of a bus extension.

Q: Can this unit be used without a bus extension?
A: It is specifically intended for bus extension termination. Using it outside this function may not provide any operational benefit.

Q: Is this product suitable for new-generation ABB control systems?
A: The DSTC176 is designed for legacy platforms such as Advant OCS and MOD 300. Compatibility with newer systems should be verified at the system architecture level.