Configured for FSK signal transmission over a coaxial serial I/O bus, the ABB DSTC452 5751017-A (DSTC452 S400 Fieldbus Modem) provides the physical modem interface for ABB S400 I/O communication systems.

Model Identification

The supplied references identify the DSTC452 as an ABB S400 Fieldbus Modem with the following ordering information:

• Product Model: DSTC452
• Spare Model: 5751017-A
• Product Type: S400 Fieldbus Modem
• Communication Method: FSK
• Bus Application: Serial I/O Bus
• Physical Interface: Coax
• Manufacturer: ABB
• Manufacturer Name: ASEA Brown Boveri
• Product Status: Discontinued by manufacturer

Hardware Specifications

Serial I/O Bus Communication

The DSTC452 is specified as an FSK modem for the ABB S400 serial I/O bus. Its communication function is based on frequency-shift keying over a coaxial physical connection.

• FSK modulation is specified for serial I/O bus communication.
• The coaxial interface provides the physical transmission medium identified in the supplied product data.
• The unit is associated with the ABB S400 I/O system.
• Communication compatibility should be verified against the installed S400 system architecture.
• The supplied data does not specify transmission speed, maximum bus length, connector type, or electrical termination requirements.
• These parameters should be confirmed from the applicable ABB system documentation before field replacement.

Ordering Information

• 1 x ABB DSTC452 S400 Fieldbus Modem
• Spare Model: 5751017-A
• Communication Type: FSK
• Bus Interface: Serial I/O Bus
• Physical Connection: Coax
• Additional accessories or mounting kits are not identified in the supplied product data.

Field Installation Guidelines

Physical Installation

• Verify the DSTC452 model and spare reference against the existing S400 I/O system before replacement.
• Install the modem in the designated equipment position according to the original system configuration.
• Ensure that the module is mechanically secured before connecting the communication cable.
• Keep the coaxial cable free from excessive bending and mechanical stress.

Coaxial Bus Connection

• Confirm that the coaxial cable type and connector arrangement match the existing S400 installation.
• Inspect coaxial connectors for contamination, mechanical damage, or loose connections.
• Route the coaxial communication cable separately from high-current power conductors where practical.
• Avoid unnecessary cable loops and maintain the original cable routing where possible.

Commissioning

• Verify the physical coaxial connection before applying system power.
• Check communication diagnostics after installation.
• Confirm correct data exchange between the S400 I/O system and the connected serial I/O bus.
• If communication faults occur, inspect cable continuity, connector condition, bus termination, and modem compatibility.

Frequently Asked Questions

• What is the ABB DSTC452?

  The DSTC452 is specified as an ABB S400 Fieldbus Modem designed for FSK communication over a serial I/O bus using a coaxial physical connection.

• What is the spare model for DSTC452?

  The supplied spare model is 5751017-A. This reference should be checked against the existing equipment documentation before replacement.

• What modulation method does DSTC452 use?

  The supplied product data specifies FSK, or frequency-shift keying, for communication over the ABB S400 serial I/O bus.

• What physical medium does the modem use?

  The supplied data specifies coax as the physical communication medium. The exact cable and connector specifications are not provided.

• Is the DSTC452 currently manufactured by ABB?

  The supplied product information identifies DSTC452 as discontinued by the manufacturer. Compatibility should therefore be verified before system replacement.

• Is the communication speed specified?

  No communication speed is provided in the supplied technical data. The applicable ABB S400 system documentation should be consulted for the supported transmission rate.

• Can any FSK modem replace the DSTC452?

  No direct substitution should be assumed. Modulation, bus protocol, coaxial interface, electrical characteristics, and system compatibility must match the S400 I/O architecture.

• What is the physical weight of DSTC452?

  The listed product weight is 1.05 kg. The estimated shipping dimensions are 11.5 x 22.5 x 5.8 cm.