Description
The NI-9421 is a robust C Series Digital I/O module, identified by part numbers 779002-01, 779136-01, 779136-02, 783734-01, and 779136-02 (Conformal Coated). This module stands out for its 8 digital input channels that operate on a 24 V logic level. It is designed for applications requiring fast data acquisition with a response time of 100 us and utilizes sinking inputs.
One of the key features of the NI-9421 is its high level of isolation, offering 250 Vrms channel-to-earth ground isolation for both screw terminal and spring terminal configurations, and 60 VDC channel-to-earth ground isolation when using a D-Sub connector. This ensures reliable and safe operation in various industrial environments.
In terms of power efficiency, the module has an active power consumption of up to 240 mW, and a very low power draw in sleep mode, with a maximum of 7 mW. It also includes channel LEDs for easy monitoring of the digital input status.
The NI-9421 is built to withstand harsh conditions, capable of operating in temperatures ranging from -40 °C to 70 °C, and being stored in temperatures from -40 °C to 85 °C. It can handle humidity levels from 10% RH to 90% RH when operating, and 5% RH to 95% RH during storage, all while remaining non-condensing. Furthermore, it is designed to endure significant vibration, supporting 5 grms (Random) and 5 g (Sinusoidal) vibrations across a frequency range of 10 to 500 Hz.
The module’s compact form factor is also notable, weighing in at just 5.1 oz, making it an efficient choice for a wide range of digital input applications where space and weight are considerations. The NI-9421’s combination of speed, isolation, and durability makes it an excellent choice for engineers and developers in need of reliable digital input solutions.
| Specification | Details |
|---|---|
| Part Numbers | 779002-01, 779136-01, 779136-02, 783734-01, 779136-02 (Conformal Coated) |
| Category | C Series Digital I/O |
| Model | NI-9421 |
| Description | 8-Ch 24 V, 100 us, Sinking DI Module, CC |
| Channels | 8 digital input channels |
| Input Type | Sinking Inputs |
| Isolation | 250 Vrms Ch-Earth Ground Isolation (Screw Terminal and Spring Terminal), 60 VDC Ch-Earth Ground Isolation (D-Sub) |
| Power Consumption | Active: up to 240 mW, Sleep Mode: 7 mW max |
| Indicators | Channel LED |
| Operating Temperature | -40 °C to 70 °C |
| Storage Temperature | -40 °C to 85 °C |
| Humidity | Operating: 10% RH to 90% RH, Storage: 5% RH to 95% RH, non-condensing |
| Vibration | Operating: 5 grms (Random), 5 g (Sinusoidal), 10 to 500 Hz |
| Weight | 5.1 oz |
Question 1: What is the operating voltage of the NI-9421?
Answer 1: 24 V
Question 2: How many input channels does the NI-9421 have?
Answer 2: 8 sinking input channels
Question 3: What is the response time of the NI-9421?
Answer 3: 100 us
Question 4: What type of isolation does the NI-9421 offer?
Answer 4: 250 Vrms channel-to-earth ground
Question 5: What is the operating temperature range of the NI-9421?
Answer 5: -40 °C to 70 °C
