Product Overview
Technical Summary
| Parameter | Value |
|---|---|
| Digital input channels | 16 |
| Simultaneously controllable inputs | 16 |
| Rated input voltage | 24 V DC |
| Signal "0" input voltage | -30 V DC to +5 V DC |
| Signal "1" input voltage | 11 V DC to 30 V DC |
| Input frequency, max. | 2 kHz |
| Input transition time, min. | 3 μs; 0.05 / 0.1 / 0.5 / 3 ms |
| Load voltage range | 20.4 V to 28.8 V DC |
| Diagnostics | Parameterizable diagnostics, diagnostic alarm, hardware interrupt, supply-voltage monitoring, wire-break detection |
| Channel separation | Between channels in groups of 8; between channels and backplane bus |
| Product lifecycle | Announcement of product phase-out |
Applications
- Digital signal acquisition: Acquires 24 V DC digital signals through 16 isolated inputs.
- Wire-break monitoring: Supports wire-break monitoring with fixed current limitation and wire-break detection.
Key Features
- 16 isolated digital inputs: Provides 16 digital inputs, with all 16 inputs simultaneously controllable and potential separation between channels in groups of 8.
- 24 V DC input signals: Input voltage is rated at 24 V DC; signal "0" is -30 V DC to +5 V DC and signal "1" is 11 V DC to 30 V DC.
- Diagnostics and alarms: Has parameterizable diagnostics, diagnostic alarms, hardware interrupts, readable diagnostic information, supply-voltage monitoring, and wire-break detection with I < 1 mA.
- Input timing: Input frequency is up to 2 kHz with a time delay of 0.1 ms; the minimum transition time is 3 μs with selectable values of 0.05 / 0.1 / 0.5 / 3 ms.
- Supply and protection: Load voltage is rated at 24 V DC with a permissible range of 20.4 V to 28.8 V, reverse polarity protection, and typical power loss of 5 W.
- Installation dimensions: Dimensions are 25 mm wide, 290 mm high, and 210 mm deep; isolation is tested with 500 V DC and shielded cable length is up to 1 000 m.
Frequently Asked Questions
1. How many digital inputs does the Siemens 6ES7421-7BH01-0AB0 have?
It has 16 isolated digital inputs, and all 16 inputs can be controlled simultaneously.
2. What input voltage ranges does this module support?
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.
3. What diagnostics are available?
It has parameterizable diagnostics, diagnostic alarms, hardware interrupts, readable diagnostic information, supply-voltage monitoring, and wire-break detection with I < 1 mA.
4. What dimensions should be verified before inquiry?
Verify the dimensions of 25 mm width, 290 mm height, and 210 mm depth, plus the required 24 V DC load-voltage range of 20.4 V to 28.8 V.
