Key Features
- Digital input SM 421 module: SIMATIC S7-400 digital input module with isolated 16 DI.
- Input voltage: Type of input voltage: AC/DC; rated value (UC): 24 V; 24 V UC to 60 V UC (47 … 63 Hz).
- Diagnostics and alarms: Diagnostics function, diagnostic alarm, and hardware interrupt: Yes; Parameterizable.
- Physical size: Width: 25 mm; Height: 290 mm; Depth: 210 mm.
Technical Summary
| Module type | digital input SM 421 |
|---|---|
| Number of digital inputs | 16 |
| Type of input voltage | AC/DC |
| Rated value (UC) | 24 V; 24 V UC to 60 V UC (47 … 63 Hz) |
| Input current from backplane bus 5 V DC, max. | 150 mA |
| Power loss, typ. | 8 W; 3.5 W (24 V DC); 6.5 W (48 V DC); 8.0 W (60 V DC) |
| Diagnostics function | Yes; Parameterizable |
| Diagnostic alarm | Yes; Parameterizable |
| Hardware interrupt | Yes; Parameterizable |
| Isolation tested with | 1 500 V AC |
Applications
- 16-channel digital signal acquisition: For connecting and monitoring 16 AC/DC digital input signals in a SIMATIC S7-400 I/O setup.
Frequently Asked Questions
What is Siemens 6ES7421-7DH00-0AB0?
It is a SIMATIC S7-400 digital input SM 421 module with isolated 16 DI.
How many digital inputs does 6ES7421-7DH00-0AB0 have?
It has 16 digital inputs, and 16 inputs can be controlled simultaneously.
What input voltage does the Siemens SM 421 module support?
The input voltage type is AC/DC, with rated value (UC) 24 V; 24 V UC to 60 V UC (47 … 63 Hz).
What diagnostics are available on 6ES7421-7DH00-0AB0?
Diagnostics function, diagnostic alarm, and hardware interrupt are available; each is parameterizable.
What are the dimensions of the Siemens 6ES7421-7DH00-0AB0 module?
Width: 25 mm; Height: 290 mm; Depth: 210 mm.
