Technical Summary
| Product family | SIMATIC S7-400 |
|---|---|
| Module type | digital input SM 421 |
| Number of digital inputs | 16 |
| Input voltage | Type of input voltage: AC/DC |
| Rated input voltage | Rated value (UC), 230 V; 120/230 V UC (47 … 63 Hz) |
| Input characteristic | Type 2 |
| Input current, from backplane bus | 80 mA |
| Power loss, typ. | 12 W |
Applications
Use for monitoring 16 AC/DC digital input signals.
Use for connecting 2-wire sensors.
Key Features
SM 421 digital input module for the SIMATIC S7-400 family.
Provides 16 DI with potential separation between the channels and between the channels and backplane bus.
Input voltage is AC/DC with rated value UC 230 V; 120/230 V UC (47 … 63 Hz).
Inputs according to IEC1131-2 Type 2 / IEC 61131 Type 2.
Announcement of product phase-out.
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 this S7-400 digital input module use?
The input voltage is AC/DC, with rated value UC 230 V; 120/230 V UC (47 … 63 Hz).
What is the lifecycle status of 6ES7421-1FH20-0AA0?
Product lifecycle: Announcement of product phase-out.
