Product Overview
Technical Summary
| Product designation | SIMATIC S7-400, digital input SM 421, isolated 32 DI; 120 V DC/AC |
|---|---|
| Digital inputs | 32 |
| Simultaneously controllable inputs | 32 |
| Rated input voltage | 120 V; 47 … 63 Hz |
| Input voltage type | AC/DC |
| Signal "0" | 0 to 20 V UC |
| Signal "1" | 79 to 132 V AC; 80 to 132 V DC |
| Channel isolation | Yes, in groups of 8 |
| Backplane bus isolation | Yes |
| 2-wire sensor | Yes; permissible quiescent current 1 mA max. |
| Product lifecycle | Announcement of product phase-out |
Key Features
- Product designation: SIMATIC S7-400, digital input SM 421, isolated 32 DI; 120 V DC/AC.
- Digital input capacity: 32 digital inputs; 32 inputs can be controlled simultaneously.
- Input voltage: AC/DC input; rated value 120 V, 47 … 63 Hz. Signal "0": 0 to 20 V UC; signal "1": 79 to 132 V AC or 80 to 132 V DC.
- Isolation: Digital inputs are isolated between channels in groups of 8 and between channels and the backplane bus. Isolation tested with 1 500 V AC.
- Sensor and indication: Supports 2-wire sensors with a permissible quiescent current of 1 mA max.; green digital-input status LED is provided.
- Product lifecycle: Announcement of product phase-out.
Frequently Asked Questions
Which specifications distinguish Siemens 6ES7421-1EL00-0AA0?
It is a SIMATIC S7-400 SM 421 digital input module with 32 isolated digital inputs, 120 V AC/DC input, 32 simultaneously controllable inputs, and 2-wire sensor support.
What input voltage details should be checked for this order number?
The input is AC/DC with a rated value of 120 V at 47 … 63 Hz. Signal "0" is 0 to 20 V UC; signal "1" is 79 to 132 V AC or 80 to 132 V DC.
What isolation and mounting details should be verified?
The digital inputs are isolated between channels in groups of 8 and between channels and the backplane bus. The dimensions are 25 mm width, 290 mm height, and 210 mm depth.
What details are needed when requesting a quotation?
Provide the complete order number 6ES7421-1EL00-0AA0 together with the required quantity and destination.
