Key Features
- 16 digital inputs: Digital input SM 421 with 16 DI.
- Isolated channel design: Potential separation is provided between the channels and between the channels and backplane bus.
- UC 120/230 V input range: Inputs are specified for 120/230 V UC and AC/DC input voltage.
- IEC1131-2 Type 2: Input characteristic according to IEC 61131 is Type 2.
- Status indication: Status indicator digital input (green): Yes.
Applications
- 120/230 V digital signal input to SIMATIC S7-400: Used for bringing AC/DC 120/230 V digital input signals into a SIMATIC S7-400 system.
Technical Summary
| Module type | SIMATIC S7-400, digital input SM 421 |
|---|---|
| Number of digital inputs | 16 |
| Input voltage type | AC/DC |
| Rated input voltage (UC) | 230 V; 120/230 V UC (47 … 63 Hz) |
| Input characteristic | Type 2 |
| Simultaneously controllable inputs | 16 |
| Signal 0 input voltage | 0 to 40 V AC/ -40 to +40 V DC |
| Signal 1 input voltage | 74 to 264 V AC; 80 to 264 V DC, -80 to -264 V |
| Diagnostics indication LED | Status indicator digital input (green) |
| Potential separation between channels | Yes |
| Potential separation between channels and backplane bus | Yes |
| Isolation tested with | 1 500 V AC |
Frequently Asked Questions
What is Siemens 6ES7421-1FH20-0AA0?
It is a SIMATIC S7-400 digital input SM 421 with 16 isolated DI.
How many digital inputs does the 6ES7421-1FH20-0AA0 have?
It has 16 digital inputs.
What input voltage range does this module support?
It supports AC/DC input voltage with rated value (UC) 230 V; 120/230 V UC (47 … 63 Hz).
Does the module provide channel isolation?
Yes. Potential separation is provided between the channels and between the channels and backplane bus.
