Key Features
- SIMATIC S7-400 digital input SM 421: Digital input module for the SIMATIC S7-400 system.
- 32 isolated digital inputs: Provides 32 DI for 24 V DC signals.
- Type 1 input characteristic: Input characteristic according to IEC 61131.
- 2-wire sensor support: Connectable to 2-wire sensor inputs.
- Green status indicator: Status indicator digital input (green): Yes.
Applications
- 24 V DC digital signal acquisition: Acquires discrete 24 V DC input signals in a SIMATIC S7-400 station.
- 2-wire sensor signal connection: Supports connection of 2-wire sensor signals to the input channels.
Technical Summary
| Product type | SIMATIC S7-400, digital input SM 421, isolated 32 DI; 24 V DC |
|---|---|
| Number of digital inputs | 32 |
| Rated value (DC) | 24 V |
| Input characteristic according to IEC 61131 | Type 1 |
| Number of simultaneously controllable inputs | 32 |
| Type of input voltage | DC |
| for signal "1" | 13 V DC to 30 V DC |
| for signal "0" | -30 V DC to +5 V DC |
| Potential separation between the channels and backplane bus | Yes |
Frequently Asked Questions
What is the Siemens 6ES7421-1BL01-0AA0 module?
It is a SIMATIC S7-400 digital input SM 421 with 32 isolated DI for 24 V DC signals.
How many digital inputs does 6ES7421-1BL01-0AA0 provide?
It provides 32 digital inputs.
What input voltage does this SM 421 module use?
The input voltage is DC, with a rated value of 24 V.
Does the module support 2-wire sensors?
Yes, 2-wire sensor support is listed.
