Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Digital input channels | 32 |
| Simultaneously controllable inputs | 32 |
| Input voltage type | AC/DC |
| Rated input voltage | 120 V; 47 … 63 Hz |
| Signal "0" input voltage | 0 to 20 V UC |
| Signal "1" input voltage | 79 to 132 V AC; 80 to 132 V DC |
| Input characteristic | Type 1 |
| Channel isolation grouping | 8 |
| Backplane bus current | 200 mA max. from 5 V DC |
| Typical power loss | 6.5 W |
| Input status indication | Green LED |
Applications
- Digital signal acquisition: Acquires 120 V AC/DC digital input signals through 32 isolated digital input channels.
Key Features
- Digital input channels: 32 isolated digital inputs, with 32 inputs simultaneously controllable.
- Input voltage: AC/DC input voltage with a rated value of 120 V; 47 … 63 Hz.
- Input signal levels: Signal "0": 0 to 20 V UC; signal "1": 79 to 132 V AC or 80 to 132 V DC.
- Electrical isolation: Isolation between channels and between the digital inputs and the backplane bus; channel isolation is arranged in groups of 8.
- Diagnostics indication: Green LED status indication is provided for the digital inputs.
- Cable and sensor connection: Supports 2-wire sensors with a permissible quiescent current of 1 mA max.; maximum cable length is 1 000 m shielded or 600 m unshielded.
Frequently Asked Questions
1. What type of module is the 6ES7421-1EL00-0AA0?
It is a SIMATIC S7-400 SM 421 digital input module with 32 isolated digital inputs.
2. What input voltage does this module support?
The input voltage type is AC/DC, with a rated value of 120 V at 47 … 63 Hz. Signal "0" is 0 to 20 V UC, while signal "1" is 79 to 132 V AC or 80 to 132 V DC.
3. How many inputs can be controlled simultaneously?
All 32 digital inputs can be controlled simultaneously.
4. Does it support 2-wire sensors?
Yes. A 2-wire sensor is supported with a permissible quiescent current of 1 mA max.
