Key Features
- Digital input module: SIMATIC S7-400 digital input SM 421 module with 16 DI.
- Isolated inputs: 16 digital inputs with isolation between the channels.
- 24 V DC input rating: Input voltage is 24 V DC.
- Diagnostics and alarms: Diagnostics, diagnostic alarm, and hardware interrupt are supported; diagnostic information is readable.
- 0.05 ms input delay alarm: Includes a 0.05 ms input delay alarm.
- Product lifecycle status: Announcement of product phase-out.
Technical Summary
| Product type | SIMATIC S7-400, digital input SM 421 |
|---|---|
| Digital inputs | 16 |
| Input voltage | 24 V DC |
| Input characteristic according to IEC 61131 | Type 2 |
| Input delay alarm | 0.05 ms |
| Input frequency (with a time delay of 0.1 ms), max. | 2 kHz |
| Diagnostics function | Yes; Parameterizable |
| Diagnostic alarm | Yes; Parameterizable |
| Hardware interrupt | Yes; Parameterizable |
| Potential separation digital inputs | between the channels |
| Potential separation digital inputs, groups of | 8 |
| Isolation tested with | 500 V DC |
Applications
- 24 V DC digital signal input: For receiving 24 V DC digital input signals on 16 channels.
- Diagnostics monitoring: For reading diagnostic information and using diagnostic alarm and hardware interrupt functions.
- Wire-break monitoring: For wire-break monitoring with the specified input current limitation.
Frequently Asked Questions
What is Siemens 6ES7421-7BH01-0AB0?
It is a SIMATIC S7-400 digital input SM 421 module.
How many digital inputs does 6ES7421-7BH01-0AB0 have?
It has 16 digital inputs.
What is the input voltage for 6ES7421-7BH01-0AB0?
The input voltage is 24 V DC.
Does 6ES7421-7BH01-0AB0 support diagnostics?
Yes. Diagnostics, diagnostic alarm, and hardware interrupt functions are supported and parameterizable.
What lifecycle status is listed for 6ES7421-7BH01-0AB0?
Announcement of product phase-out.
