DSTC176 | 57310001-NF | ABB | Bus Extension Terminator Unit

Product Description

The DSTC176 (Order No. 57310001-NF) is a dedicated bus termination device developed by ABB for use in extended fieldbus and system communication architectures.
Its primary role is to terminate the final node of a bus extension, ensuring impedance matching and eliminating signal reflections that can compromise data integrity.

Designed as an auxiliary component for legacy and hybrid ABB control platforms, this unit supports stable communication across long-distance bus extensions in distributed control installations. Its passive termination design minimizes electrical noise and maintains predictable signal behavior under continuous operation.

As a control system accessory, DSTC176 does not perform signal processing or I/O functions but is essential for reliable system-level communication.

Functional Characteristics

DSTC176 is installed exclusively at the physical end of a bus segment and operates as a fixed impedance terminator. Key operational functions include:

• Stabilizing differential bus signals at extended cable lengths

• Preventing waveform distortion caused by signal reflection

• Maintaining defined electrical impedance at the bus endpoint

• Supporting deterministic data transmission in multi-node systems

The module is optimized for ABB proprietary bus extensions used within Advant-era and S-series architectures.

Technical Specifications

Mechanical Design

• Product category: Bus extension termination accessory

• Mounting type: Inline / end-of-line bus installation

• Housing form factor: Slim, low-profile industrial enclosure

Dimensions

• Length: 255 mm

• Width: 115 mm

• Height: 20 mm

• Net weight: 0.03 kg

Electrical Parameters

• Nominal supply voltage: 24 V DC

• Typical current draw: ~50 mA

• Internal termination impedance: 50 Ω

• Supported bus capacity: Up to 128 logical channels (system-dependent)

Environmental & Compliance

• Operating environment: Industrial control cabinets

• RoHS compliance: No

• WEEE classification: Category 5 – Small equipment

System Compatibility

The DSTC176 (57310001-NF) is intended for use within the following ABB control platforms:

• Advant OCS distributed control systems

• Advant Controller 450 architectures

• S100 I/O systems

• S800 I/O systems when used with bus extension configurations

Compatibility depends on system topology and bus extension design.

Typical Use Cases

This terminator unit is commonly applied in:

• Distributed control systems with long bus runs

• Power generation and utility automation networks

• Chemical and petrochemical process control

• Manufacturing plants with segmented I/O layouts

• Retrofit or expansion of legacy ABB control systems

FAQ

Q: Does DSTC176 perform any signal conversion or diagnostics?
A: No. DSTC176 is a passive termination device. It does not modify, amplify, or monitor signals.

Q: Can DSTC176 be installed at intermediate bus nodes?
A: No. It must be installed only at the physical end of a bus segment to avoid impedance mismatch.

Q: Is this unit interchangeable with standard resistor terminators?
A: No. ABB bus systems require system-specific termination characteristics that generic resistors cannot guarantee.