Product Details
The ABB NTDI21-B, also cataloged as the NTDI21-B Termination Unit, operates as a dedicated hardware component for digital input/output signal termination and galvanic isolation within ABB Bailey Infi 90 / Network 90 control networks.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | NTDI21-B |
| Brand | ABB |
| Origin | USA |
| Weight | 0.85 kg |
| Dimensions | 240 mm x 120 mm x 50 mm |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 24 VDC Loop Powered |
| Digital Inputs | 16 Channels |
| Digital Outputs | 16 Channels |
| Signal Isolation | Built-in Isolation Transformer |
| Transient Protection | Integrated Surge Protection Circuitry |
Deterministic Network Integration and I/O Density Scaling
The NTDI21-B termination unit routes 16 discrete input signals and 16 discrete output channels to backplane processing modules, ensuring steady backplane bus communication velocity across Profinet and EtherNet/IP deterministic networks. Channel-to-channel isolation and onboard surge absorption circuits shield logic-level hardware from voltage spikes and noise. Dense terminal block layout maximizes I/O density scaling within processing cabinets, while internal passive routing pathways maintain full firmware flash compatibility across primary controller modules.
Frequently Asked Questions
Q: Can digital signal field cables be wired to the NTDI21-B while the connected I/O module is under load?
A: Field power supplies must be de-energized prior to wiring or removing terminal connections to prevent electrical arcing and signal line transients.
Q: How does the internal isolation transformer protect connected controller circuitry?
A: The integrated transformer provides a physical galvanically isolated barrier, preventing ground loops and high-voltage line surges from reaching the logic backplane.
Q: What grounding procedure is required for the integrated surge protection circuits?
A: The ground terminal on the chassis mounting lug must be connected directly to the panel functional earth bus using a low-impedance grounding conductor.
Field Installation Guidelines
- Disconnect loop power sources and main cabinet power before installing or servicing field terminal connections.
- Ensure all terminal screw connections are torqued properly to maintain low-resistance contact on discrete I/O wiring.
- Maintain separation between field AC/DC power conductors and low-voltage digital signal cables to minimize electromagnetic coupling.
- Verify proper seating of multi-pin cable connectors between the termination unit and the corresponding controller rack module.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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