Technical Summary
| Product designation | 6ES7421-7DH00-0AB0 |
|---|---|
| Module type | SIMATIC S7-400, digital input SM 421 |
| Number of digital inputs | 16 |
| Rated input voltage (UC) | 24 V; 24 V UC to 60 V UC (47 … 63 Hz) |
| Type of input voltage | AC/DC |
| Input current from backplane bus, max. | 150 mA |
| Power loss, typ. | 8 W; 3.5 W (24 V DC); 6.5 W (48 V DC); 8.0 W (60 V DC) |
| Diagnostics function | Yes; Parameterizable |
| Wire break | Yes; I> 0.7 mA |
Key Features
SIMATIC S7-400 digital input SM 421
Signal module for the SIMATIC S7-400 family.
Signal module for the SIMATIC S7-400 family.
16 isolated digital inputs
Provides 16 DI with potential separation between the channels and between the channels and backplane bus.
Provides 16 DI with potential separation between the channels and between the channels and backplane bus.
UC 24 – 60 V input range
Rated value (UC): 24 V; 24 V UC to 60 V UC (47 … 63 Hz).
Rated value (UC): 24 V; 24 V UC to 60 V UC (47 … 63 Hz).
Alarm and diagnostics
Supports diagnostics function, diagnostic alarm, and hardware interrupt; diagnostic information readable.
Supports diagnostics function, diagnostic alarm, and hardware interrupt; diagnostic information readable.
Isolation tested
Isolation tested with 1 500 V AC.
Isolation tested with 1 500 V AC.
Applications
Digital input signal acquisition
Collects 16 AC/DC digital input signals for a SIMATIC S7-400 system.
Collects 16 AC/DC digital input signals for a SIMATIC S7-400 system.
Frequently Asked Questions
What is Siemens 6ES7421-7DH00-0AB0?
It is a SIMATIC S7-400 digital input SM 421 module with isolated 16 DI.
How many digital inputs does 6ES7421-7DH00-0AB0 have?
It has 16 digital inputs.
What input voltage range does 6ES7421-7DH00-0AB0 support?
Rated value (UC): 24 V; 24 V UC to 60 V UC (47 … 63 Hz).
Which diagnostics functions are available on 6ES7421-7DH00-0AB0?
Diagnostics function, diagnostic alarm, and hardware interrupt are supported; diagnostic information is readable.
