Overview
The NTDI21-A is a controller module within the ABB NTDI21 series, designed for digital input signal acquisition in industrial automation systems. It operates on a 24 V DC nominal supply with an operational range of 15–30 V DC, drawing approximately 2–5 mA per channel. The module recognizes high-level (ON) signals at ≥18 V DC and low-level (OFF) signals at ≤5 V DC, with a response time of ≤1 ms. This configuration ensures accurate and fast signal detection for control and monitoring applications.
Electrical Specifications
| Parameter | Specification |
|---|---|
| Model | NTDI21-A |
| Brand | ABB |
| Input Voltage Range | 24 V DC |
| Operational Range | 15–30 V DC |
| Current Consumption | Typically 2–5 mA per channel |
| High-Level (ON) | ≥18 V DC |
| Low-Level (OFF) | ≤5 V DC |
| Response Time | ≤ 1 ms |
Physical and Shipping Data
| Parameter | Specification |
|---|---|
| Tariff Code | 8537101190 |
| Country of origin | Sweden |
| Place of shipment | Xiamen, China |
| Estimated Shipping Size | 18 x 17.6 x 2 cm |
| Weight | 0.36 kg |
Signal Characteristics and Application
The module’s input thresholds are defined to ensure reliable operation in electrically noisy environments. A high-level state requires a minimum of 18 V DC, which prevents false triggering from voltage drops or interference on long field cables. The low-level threshold of 5 V DC or below guarantees a clean off-state recognition. With a response time of 1 ms or less, the NTDI21-A can capture rapid state changes, making it suitable for time-critical digital input processing in DCS or PLC architectures.
Frequently Asked Questions
Q: What is the nominal input voltage for the NTDI21-A?
A: The nominal input voltage is 24 V DC, with an operational range of 15–30 V DC.
Q: What are the on and off voltage thresholds for this module?
A: The module recognizes an ON state at ≥18 V DC and an OFF state at ≤5 V DC.
Q: How quickly does the NTDI21-A respond to input changes?
A: The response time is ≤1 ms, enabling fast and accurate digital signal acquisition.
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Contact: Manski Wong +86 18030205725 manski@cambia.cn
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