Key Features
- Digital input module: SIMATIC S7-400 digital input SM 421.
- Input channels: 32 isolated digital inputs.
- Input voltage: 120 V DC/AC.
- Potential separation: Between the channels and between the channels and backplane bus.
- Diagnostics indication: Status indicator digital input (green).
Technical Summary
| Product type | SIMATIC S7-400, digital input SM 421, isolated 32 DI; 120 V DC/AC |
|---|---|
| Number of digital inputs | 32 |
| Input voltage type | AC/DC |
| Rated input voltage (UC) | 120 V; 47 … 63 Hz |
| Signal 1 input voltage | 79 to 132 V AC; 80 to 132 V DC |
| Signal 0 input voltage | 0 to 20 V UC |
| Input characteristic according to IEC 61131 | Type 1 |
| Backplane bus current consumption | 200 mA |
| Typical power loss | 6.5 W |
| Potential separation | between the channels and backplane bus |
Applications
- 120 V DC/AC digital signal input: Use for receiving 120 V DC/AC digital input signals through 32 isolated channels.
- 2-wire sensor connection: Use with 2-wire sensor inputs where the permissible quiescent current is within the specified limit.
Frequently Asked Questions
What is the exact Siemens model and product type?
6ES7421-1EL00-0AA0 is a SIMATIC S7-400 digital input SM 421 with 32 isolated DI for 120 V DC/AC.
How many digital inputs does 6ES7421-1EL00-0AA0 have?
It has 32 digital inputs.
What input voltage does this SIMATIC S7-400 module use?
The rated input voltage is 120 V; 47 … 63 Hz and the input type is AC/DC.
What connection details should be checked before ordering this module?
Confirm the 32 isolated digital inputs, the 120 V DC/AC input specification, and the product lifecycle status of Announcement of product phase-out.
