Product Description
Key Features
- Exact module identity: SIMATIC S7-400 digital input SM 421 with isolated 16 DI and a product phase-out announcement.
- Digital input capacity: 16 digital inputs; all 16 inputs can be controlled simultaneously. Input characteristic according to IEC 61131: Type 2.
- Input voltage: 24 V DC rated input voltage; signal "0": -30 V DC to +5 V DC; signal "1": 11 V DC to 30 V DC.
- Supply and protection: Load voltage: 24 V rated, with a permissible range of 20.4 V to 28.8 V DC and reverse polarity protection.
- Diagnostics and alarms: Parameterizable diagnostics, diagnostic alarm, hardware interrupt, supply-voltage monitoring, and wire-break detection with I < 1 mA.
- Installation and isolation: Width: 25 mm; height: 290 mm; depth: 210 mm; isolation tested with 500 V DC. Digital inputs are potential-separated in groups of 8.
Applications
- Digital signal acquisition: Acquires digital input signals through 16 isolated digital inputs.
- Input diagnostics: Provides parameterizable diagnostics, diagnostic alarms, hardware interrupts, supply-voltage monitoring, and wire-break detection.
Technical Summary
| Product | 6ES7421-7BH01-0AB0 |
|---|---|
| Module | SIMATIC S7-400, digital input SM 421, isolated 16 DI |
| Product lifecycle | Announcement of product phase-out |
| Rated input voltage | 24 V DC |
| Digital inputs | 16 |
| Input characteristic | Type 2 according to IEC 61131 |
| Simultaneously controllable inputs | 16 |
| Input frequency, max. | 2 kHz |
| Diagnostics | Parameterizable diagnostics, diagnostic alarm, hardware interrupt, supply-voltage monitoring, and wire-break detection |
Frequently Asked Questions
What is the exact order number of this SM 421 module?
The exact order number is 6ES7421-7BH01-0AB0.
How many digital inputs does the module have?
It has 16 isolated digital inputs, and all 16 can be controlled simultaneously.
What input voltage does the module use?
The rated input voltage is 24 V DC. Signal "0" is -30 V DC to +5 V DC, and signal "1" is 11 V DC to 30 V DC.
Which diagnostics functions are available?
Parameterizable diagnostics, diagnostic alarms, hardware interrupts, readable diagnostic information, supply-voltage monitoring, and wire-break detection are available.
