Key Features
- 32 isolated digital inputs: Digital input SM 421 with 32 DI.
- 120 V DC/AC input: Rated value (UC): 120 V; 47 … 63 Hz.
- Diagnostics LED: Status indicator digital input (green): Yes.
- Channel and backplane bus separation: Potential separation between the channels: Yes, in groups of 8; between the channels and backplane bus: Yes.
- Cable length support: Shielded cable, max. 1 000 m; unshielded cable, max. 600 m.
Applications
- 120 V AC/DC digital signal acquisition: For integrating 120 V AC/DC digital inputs into a SIMATIC S7-400 system.
- 2-wire sensor connection: Supports connection of 2-wire sensor signals.
- Discrete input integration through the backplane bus: For bringing isolated digital input signals into the backplane bus of the controller system.
Technical Summary
| Number of digital inputs | 32 |
|---|---|
| Input type | AC/DC |
| Rated value (UC) | 120 V; 47 … 63 Hz |
| Input characteristic according to IEC 61131 | Type 1 |
| Number of simultaneously controllable inputs | 32 |
| Power loss, typ. | 6.5 W |
| from backplane bus 5 V DC, max. | 200 mA |
| shielded, max. | 1 000 m |
| unshielded, max. | 600 m |
Frequently Asked Questions
What is Siemens 6ES7421-1EL00-0AA0?
It is a SIMATIC S7-400 digital input SM 421 with 32 isolated digital inputs and 120 V DC/AC input.
How many digital inputs does 6ES7421-1EL00-0AA0 provide?
It provides 32 digital inputs.
What input voltage does the SM 421 support?
The rated value (UC) is 120 V; 47 … 63 Hz, and the input type is AC/DC.
What installation and wiring limits are listed for this module?
Shielded cable is supported up to 1 000 m, unshielded cable up to 600 m, and the module width is 25 mm.
