ABB NTDI21-B Bailey INFI 90 Digital Input Termination Hardware
Manufacturer: ABB
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Part Number: NTDI21-B
Condition：New with Original Package
Product Type: Digital Input Modules
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Country of Origin: Sweden
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
ABB NTDI21-B Bailey INFI 90 Digital Input Termination Unit
The ABB NTDI21-B is a digital input termination unit designed for ABB Bailey INFI 90 distributed control systems. It provides an organized physical interface between field wiring and system-level digital input circuitry, terminating 16 discrete signal channels from field sensors, switches, and pushbuttons within industrial control cabinets.
Signal Connection and Operational Features
The termination hardware interfaces 16 digital input channels operating at 24 V DC field signal levels, with a typical input current of 2 to 5 mA per channel. Built-in signal isolation transformers and surge protection safeguard the control system circuitry from field-side voltage transients and ground loops.
Diagnostics and System Integration
Designed for mounting in industrial control cabinets, the unit includes hardware-level fault detection and diagnostic reporting capabilities to assist maintenance engineers in troubleshooting field wiring integrity. Screw terminal blocks accommodate structured connection layouts for standard 24 V DC discrete automation signals.
| Parameter | Specification |
|---|---|
| Model | NTDI21-B |
| Brand | ABB Bailey |
| Product Series | Bailey INFI 90 |
| Product Type | Digital Input Termination Hardware |
| Number of Channels | 16 digital inputs |
| Field Signal Voltage | 24 V DC |
| Input Current | Approx. 2 mA to 5 mA per channel |
| Signal Protection | Surge protection, isolation transformer |
| Diagnostic Functions | Built-in fault detection and reporting |
| Field Connection | Industrial field wiring terminals |
| Mounting Type | Industrial control cabinet mounting |
| Weight | 630 g |
| Country of Origin | Sweden |
Frequently Asked Questions
Q: Which control system is the ABB NTDI21-B compatible with? A: The NTDI21-B is specifically designed for integration within ABB Bailey INFI 90 distributed control systems.
Q: What channel capacity and signal voltage does the NTDI21-B support? A: It provides signal termination for 16 digital input channels operating at a nominal 24 V DC field voltage.
Q: What protective features are built into the termination unit? A: The unit features integrated surge protection and isolation transformers to shield system circuitry from electrical transients and field noise.