Key Features
- Digital input module: SIMATIC S7-400, digital input SM 421.
- 16 isolated digital inputs: 16 DI with potential separation between the channels and between the channels and backplane bus.
- UC 120/230 V input rating: Rated value (UC): 230 V; 120/230 V UC (47 … 63 Hz).
- IEC1131-2 Type 2 input characteristic: Input characteristic according to IEC 61131: Type 2.
- AC/DC input voltage: Type of input voltage: AC/DC.
- 2-wire sensor support: 2-wire sensor: Yes.
Technical Summary
| Product type | SIMATIC S7-400, digital input SM 421 |
|---|---|
| Number of digital inputs | 16 |
| Potential separation | between the channels; between the channels and backplane bus: Yes |
| Input characteristic | IEC 61131 Type 2 |
| Input voltage type | AC/DC |
| Rated value (UC) | 230 V; 120/230 V UC (47 … 63 Hz) |
| Input voltage for signal "0" | 0 to 40 V AC/ -40 to +40 V DC |
| Input voltage for signal "1" | 74 to 264 V AC; 80 to 264 V DC, -80 to -264 V |
Applications
- Digital input acquisition: Use for reading 16 digital input signals in a SIMATIC S7-400 configuration.
- AC/DC signal monitoring: Use for monitoring AC/DC input signals with UC 120/230 V inputs.
Frequently Asked Questions
What is Siemens 6ES7421-1FH20-0AA0?
It is a SIMATIC S7-400 digital input SM 421 module.
How many digital inputs does 6ES7421-1FH20-0AA0 have?
It has 16 digital inputs.
What input voltage does the 6ES7421-1FH20-0AA0 support?
The input voltage type is AC/DC, with rated value (UC) 230 V; 120/230 V UC (47 … 63 Hz).
What are the maximum cable lengths for this module?
The maximum cable length is 1 000 m for shielded cables and 600 m for unshielded cables.
What should be confirmed before ordering this Siemens module?
Confirm the exact model 6ES7421-1FH20-0AA0, the required quantity, destination, and dispatch conditions.
