Technical Summary
| Product type | SIMATIC S7-400, digital input SM 421 |
|---|---|
| Number of digital inputs | 16 |
| Input voltage | 24 V DC |
| Input voltage for signal "1" | 11 V DC to 30 V DC |
| Input current for signal "1", typ. | 6 mA; 6 to 8 mA |
| Input frequency, max. | 2 kHz |
| Potential separation between the channels | Yes |
| Potential separation between the channels and backplane bus | Yes |
| Diagnostics function | Yes; Parameterizable |
| Diagnostic alarm | Yes; Parameterizable |
Key Features
16 isolated digital inputs
Digital input SM 421 with isolated 16 DI.
Digital input SM 421 with isolated 16 DI.
24 V DC input voltage
Designed for 24 V DC input voltage.
Designed for 24 V DC input voltage.
0.05 ms input delay alarm
Includes a 0.05 ms input delay alarm.
Includes a 0.05 ms input delay alarm.
Diagnostics support
Diagnostics are included.
Diagnostics are included.
SIMATIC S7-400 module
Part of the SIMATIC S7-400 range.
Part of the SIMATIC S7-400 range.
Applications
24 V DC digital input signal acquisition
For acquiring 24 V DC digital input signals through 16 isolated channels.
For acquiring 24 V DC digital input signals through 16 isolated channels.
Input diagnostics and alarm monitoring
For diagnostics and input delay alarm monitoring on the digital input module.
For diagnostics and input delay alarm monitoring on the digital input module.
Frequently Asked Questions
What is 6ES7421-7BH01-0AB0?
It is a SIMATIC S7-400 digital input SM 421 with isolated 16 DI.
How many digital inputs does 6ES7421-7BH01-0AB0 have?
It has 16 digital inputs.
What input voltage does 6ES7421-7BH01-0AB0 use?
The input voltage is 24 V DC.
What diagnostics features are available on 6ES7421-7BH01-0AB0?
Diagnostics function and diagnostic alarm are both available and parameterizable.
