Product Description
Key Features
- Exact module identity: SIMATIC S7-400 digital input SM 421 with 16 isolated digital inputs.
- Input voltage: AC/DC inputs with rated value 230 V; 120/230 V UC (47 … 63 Hz).
- Input characteristic: Digital inputs according to IEC 61131 Type 2.
- Signal thresholds: Signal "0": 0 to 40 V AC / -40 to +40 V DC. Signal "1": 74 to 264 V AC; 80 to 264 V DC, -80 to -264 V.
- Channel isolation: Digital inputs are electrically separated between channels, in groups of 4, and between channels and the backplane bus.
- Lifecycle data: Product lifecycle: Announcement of product phase-out.
Applications
- Digital signal input: Accepts digital input signals through 16 isolated digital inputs.
Technical Summary
| Product | 6ES7421-1FH20-0AA0 |
|---|---|
| Module | SIMATIC S7-400, digital input SM 421 |
| Digital inputs | 16 |
| Input voltage | AC/DC |
| Rated input voltage | 230 V; 120/230 V UC (47 … 63 Hz) |
| Input characteristic | Type 2 according to IEC 61131 |
| Backplane bus input current | 5 V DC, max. 80 mA |
| Power loss | 12 W, typ. |
| Channel isolation | Between channels, in groups of 4; between channels and backplane bus |
| Product lifecycle | Announcement of product phase-out |
Frequently Asked Questions
How can I verify the exact Siemens module for a replacement inquiry?
Confirm the complete order number 6ES7421-1FH20-0AA0 and the SIMATIC S7-400 SM 421 identity.
How many digital inputs does 6ES7421-1FH20-0AA0 have?
It has 16 isolated digital inputs, and all 16 inputs can be controlled simultaneously.
What input voltage should be confirmed for this module?
Confirm AC/DC input voltage and the rated value 230 V; 120/230 V UC (47 … 63 Hz).
Does this module provide diagnostics?
No. The diagnostics function is not available, but a green digital-input status LED is provided.
What lifecycle information should be considered?
The product lifecycle is Announcement of product phase-out. Confirm quantity, destination, and condition preference for the inquiry.
