Product Overview
Applications
Acquisition of digital AC/DC signals through 16 isolated digital inputs.
Technical Summary
| Order number | 6ES7421-1FH20-0AA0 |
|---|---|
| Module type | SIMATIC S7-400 SM 421 digital input |
| Digital inputs | 16 |
| Input voltage | AC/DC; 120/230 V UC (47 … 63 Hz) |
| Input characteristic | Type 2 according to IEC 61131 |
| Potential separation | Between channels in groups of 4; between channels and backplane bus |
| Backplane bus current | 5 V DC, max. 80 mA |
| Power loss | 12 W, typ. |
| Diagnostics function | No |
Key Features
The SM 421 module has 16 digital inputs, with all 16 inputs simultaneously controllable.
Rated input voltage is 230 V; 120/230 V UC at 47 … 63 Hz. Signal "0" is 0 to 40 V AC / -40 to +40 V DC, and signal "1" is 74 to 264 V AC; 80 to 264 V DC, -80 to -264 V.
The input characteristic is Type 2 according to IEC 61131.
Digital inputs are electrically separated between channels in groups of 4 and between the channels and the backplane bus.
The module supports two-wire sensors with a permissible quiescent current of 5 mA AC, max.
Dimensions are 25 mm wide, 290 mm high, and 210 mm deep; approximate weight is 650 g.
Frequently Asked Questions
What is the exact Siemens order number and module type?
The exact order number is 6ES7421-1FH20-0AA0, a SIMATIC S7-400 SM 421 digital input module.
How many digital inputs does the module have?
It has 16 isolated digital inputs, and all 16 inputs are simultaneously controllable.
What input voltage does this line item use?
It uses AC/DC input voltage with 120/230 V UC at 47 … 63 Hz.
How are the digital inputs separated?
The inputs are separated between channels in groups of 4 and between the channels and the backplane bus.
