Key Features
- 16 digital inputs: Digital input module with 16 DI.
- Isolated channel design: Digital inputs are isolated, with potential separation between the channels and between the channels and backplane bus.
- Alarm and diagnostics: Supports alarm and diagnostics functions, with diagnostic alarm and hardware interrupt parameterization.
- AC/DC input voltage: Type of input voltage: AC/DC.
- Selectable input timing: For standard inputs, the rated value is 0.5 ms; 0.5 / 3 / 10 / 20 ms.
Applications
- 16-channel signal acquisition: Use for collecting 16 digital input signals in an S7-400 system.
- Alarm and diagnostics handling: Use for alarm and diagnostic monitoring through parameterizable diagnostic and hardware interrupt functions.
Technical Summary
| Number of digital inputs | 16 |
|---|---|
| Input voltage type | AC/DC |
| Rated value (UC) | 24 V; 24 V UC to 60 V UC (47 … 63 Hz) |
| Diagnostics function | Yes; Parameterizable |
| Diagnostic alarm | Yes; Parameterizable |
| Hardware interrupt | Yes; Parameterizable |
| Potential separation between the channels | Yes |
| Potential separation between the channels and backplane bus | Yes |
| Isolation tested with | 1 500 V AC |
Frequently Asked Questions
What is Siemens 6ES7421-7DH00-0AB0 used for?
It is a SIMATIC S7-400 digital input SM 421 module with 16 isolated DI, alarm, and diagnostics.
How many digital inputs does 6ES7421-7DH00-0AB0 provide?
It provides 16 digital inputs.
What input voltage range does this S7-400 digital input module support?
Rated value (UC): 24 V; 24 V UC to 60 V UC (47 … 63 Hz).
Does 6ES7421-7DH00-0AB0 support diagnostics and interrupts?
Yes. Diagnostics function, diagnostic alarm, and hardware interrupt are each parameterizable.
What installation size and weight are listed for this module?
Width: 25 mm, height: 290 mm, depth: 210 mm, weight, approx.: 600 g.
