Key Features
- 16 digital inputs: Digital input SM 421 with 16 DI.
- 24 V DC input voltage: Input voltage: 24 V DC.
- Isolated channels and diagnostics: Isolated digital inputs with diagnostics and diagnostic alarm functions.
- 0.05 ms input delay alarm: Input delay alarm: 0.05 ms.
- SIMATIC S7-400 signal module: Designed for the SIMATIC S7-400 signal module range.
Applications
- Digital input signal acquisition: For acquiring 24 V DC digital input signals on 16 isolated channels.
- Diagnostic monitoring of input signals: For monitoring input status with diagnostics, diagnostic alarms, and hardware interrupt support.
Technical Summary
| Digital inputs | 16 |
|---|---|
| Input voltage | 24 V DC |
| Input voltage, permissible range | 20.4 V to 28.8 V |
| Input characteristic according to IEC 61131 | Type 2 |
| Input delay alarm | 0.05 ms |
| Input frequency, max. | 2 kHz |
| Diagnostics function | Yes; Parameterizable |
| Diagnostic alarm | Yes; Parameterizable |
| Hardware interrupt | Yes; Parameterizable |
| Potential separation | between the channels and backplane bus; between the channels in groups of 8 |
| Isolation tested with | 500 V DC |
Frequently Asked Questions
What is the Siemens 6ES7421-7BH01-0AB0 used for?
It is a SIMATIC S7-400 digital input SM 421 with 16 DI for 24 V DC input signals.
How many digital inputs does 6ES7421-7BH01-0AB0 provide?
It provides 16 digital inputs.
What input voltage does the module use?
The input voltage is 24 V DC, with a permissible range of 20.4 V to 28.8 V.
What diagnostics and interrupt functions are supported?
Diagnostics function, diagnostic alarm, and hardware interrupt are supported and parameterizable.
What should be checked before selection?
Check the 16 DI count, 24 V DC input voltage, 0.05 ms input delay alarm, diagnostics requirements, and the SIMATIC S7-400 signal module fit.
