Technical Summary
| Product family | SIMATIC S7-400 |
|---|---|
| Module type | digital input SM 421 |
| Number of digital inputs | 32 |
| Input voltage type | AC/DC |
| Rated input value (UC) | 120 V; 47 … 63 Hz |
| Input characteristic | Type 1 |
| Potential separation | between the channels |
| Potential separation to backplane bus | Yes |
| Diagnostics LED | Status indicator digital input (green) |
| Power loss, typ. | 6.5 W |
Key Features
SIMATIC S7-400 SM 421 digital input module
Digital input module for the SIMATIC S7-400 family.
Digital input module for the SIMATIC S7-400 family.
32 isolated digital inputs
Number of digital inputs: 32. Potential separation between the channels and between the channels and backplane bus.
Number of digital inputs: 32. Potential separation between the channels and between the channels and backplane bus.
120 V DC/AC input voltage
Type of input voltage: AC/DC. Rated value (UC): 120 V; 47 … 63 Hz.
Type of input voltage: AC/DC. Rated value (UC): 120 V; 47 … 63 Hz.
Type 1 input characteristic
Input characteristic according to IEC 61131: Type 1.
Input characteristic according to IEC 61131: Type 1.
Status indicator digital input (green)
Diagnostics indication LED for digital input status.
Diagnostics indication LED for digital input status.
Applications
Digital input acquisition
Connects 32 digital input signals to the SIMATIC S7-400.
Connects 32 digital input signals to the SIMATIC S7-400.
AC/DC signal monitoring
Handles 120 V DC/AC input signals for control system signal acquisition.
Handles 120 V DC/AC input signals for control system signal acquisition.
Frequently Asked Questions
What is Siemens 6ES7421-1EL00-0AA0?
It is a SIMATIC S7-400 digital input module, SM 421, with 32 isolated digital inputs.
How many digital inputs does 6ES7421-1EL00-0AA0 have?
It has 32 digital inputs.
What input voltage does 6ES7421-1EL00-0AA0 use?
The input voltage type is AC/DC, with a rated value (UC) of 120 V; 47 … 63 Hz.
What protection or separation features are included?
The digital inputs have potential separation between the channels and between the channels and backplane bus.
