ABB Bailey NTDI21-A Digital Input Termination Unit

Description

The ABB NTDI21-A is a high-density digital input termination unit designed for use within the Bailey INFI 90 and Symphony Plus distributed control systems. It acts as the physical junction for field-level discrete signals, facilitating the connection of status contacts to the system's digital input modules. This unit is specifically engineered to handle 24 VDC logic levels and provides organized routing for up to 16 input channels. By consolidating field wiring into a standardized interface, the NTDI21-A ensures reliable signal transmission and simplifies the overall cabinet architecture in demanding industrial environments.

Specifications

• Brand: ABB Bailey

• Model Number: NTDI21-A

• Product Series: INFI 90 / Symphony Plus

• Input Channels: 16 Discrete Points

• Signal Voltage: 24 VDC nominal

• Mounting: Standard N-type Termination Unit Mounting Base

• Interface Connector: Multi-pin header for I/O module cables

• Wiring Terminal Type: Compression-style screw terminals

• Operational Temperature: 0 to 70 degrees Celsius

• Coating: Standard industrial PCB protection

Features

• Efficient Signal Routing: Distributes 16 independent digital inputs across a compact modular footprint to maximize enclosure space.

• Streamlined Maintenance: Allows for the replacement of digital slave modules without the need to disconnect or label individual field wires.

• Passive Circuit Architecture: Features a high-reliability passive design that eliminates the need for external power at the termination level.

• Logic Compatibility: Optimized for use with 24 VDC discrete signals common in motor control and switchgear monitoring.

• Robust Hardware Interface: Equipped with heavy-duty terminal blocks to ensure secure mechanical and electrical connections.

• System Integration: Designed for direct compatibility with IMDSI series digital input slave modules via standard system cabling.