Product Overview
Technical Summary
| Product | SIMATIC S7-400 digital input SM 421, isolated 32 DI; 24 V DC |
|---|---|
| Digital inputs | 32 |
| Rated input voltage | 24 V DC |
| Signal "0" input range | -30 V DC to +5 V DC |
| Signal "1" input range | 13 V DC to 30 V DC |
| Input characteristic | Type 1 according to IEC 61131 |
| Backplane bus current | 20 mA maximum from 5 V DC |
| Power loss | 6 W typical |
Key Features
32 isolated digital inputs; 32 inputs can be controlled simultaneously.
DC input with a rated value of 24 V; signal "0": -30 V DC to +5 V DC, signal "1": 13 V DC to 30 V DC.
Type 1 input characteristic according to IEC 61131.
Maximum cable length: 1 000 m shielded or 600 m unshielded.
Digital inputs are separated from the backplane bus; channels are not separated from one another, in groups of 32. Diagnostics function: No; green digital-input status LED: Yes.
Announcement of product phase-out.
Frequently Asked Questions
What is the exact configuration of 6ES7421-1BL01-0AA0?
It is a SIMATIC S7-400 digital input SM 421 with isolated 32 DI and a 24 V DC input.
What input voltage ranges does this module support?
The rated input voltage is 24 V DC. Signal "0" is -30 V DC to +5 V DC, and signal "1" is 13 V DC to 30 V DC.
What cable lengths are supported?
The maximum cable length is 1 000 m for shielded cable and 600 m for unshielded cable.
Does it provide input diagnostics?
The diagnostics function is No, while the digital-input status indicator is a green LED.
