6ES7421-7BH01-0AB0 SIMATIC S7-400 Digital Input Module
Isolated 16-channel DI for 24 V DC signals. Features 0.05 ms input delay, alarm, and diagnostics. Designed for high-density industrial automation systems.
Technical Specifications
| Brand | Siemens |
| Model | 6ES7421-7BH01-0AB0 |
| Series | SIMATIC S7-400 |
| Module Type | Digital Input SM 421 |
| Inputs | 16 isolated, 24 V DC |
| Input Delay | 0.05 / 0.1 / 0.5 / 3 ms (programmable) |
| Rated Voltage | 24 V DC (20.4 – 28.8 V) |
| Current Consumption | 120 mA (L+), 130 mA (backplane) |
| Encoder Supply | 2 outputs, 120 mA each, short-circuit protected |
| Power Loss | 5 W typ. |
| Diagnostics | Supply, wire-break (I < 1 mA), parameterizable |
| Isolation | 500 V DC tested, group isolation (8 channels) |
| Dimensions | 25 x 290 x 210 mm (W x H x D) |
| Weight | approx. 600 g |
Key Features & Diagnostics
- High-speed inputs – programmable delay from 0.05 ms to 3 ms.
- Diagnostic alarm & hardware interrupt – parameterizable for fast fault response.
- Wire-break monitoring – detects I < 1 mA, supports 2-wire sensors.
- LED indicators – PWR (green), INTF (red), EXTF (red), and channel status (green).
- Reverse polarity protection – built-in for supply voltage.
- Cable length – shielded up to 1000 m, unshielded up to 600 m.
Environmental & Compliance
- Temperature range – 0 °C to 60 °C (operation).
- Storage temperature – -40 °C to +70 °C.
- Relative humidity – 95% non-condensing.
- EMC immunity – meets EN 61000-6-2 industrial standard.
- Certifications – CE, UL, CSA, FM, and IEC 61131-2 compliance.
Installation & Commissioning
- Mounting on S7-400 rack (U-bus).
- Front connector with screw or spring terminals (optional).
- Parameterization via STEP 7 or TIA Portal.
- Hot-swap capable for redundant systems.
Maintenance & Diagnostics Convenience
- Diagnostic buffer readable via software.
- Channel-specific fault LEDs for quick troubleshooting.
- Wire-break detection reduces downtime.
- Firmware update via memory card or online.
Compatibility
- Fits all S7-400 racks and power supplies.
- Compatible with ET 200M and remote I/O.
- Works with PROFIBUS and PROFINET (via IM).
- Supports redundant CPU and I/O configurations.
Typical Applications
- High-speed counting and positioning.
- Alarm monitoring in process control.
- Sensor interfacing in manufacturing lines.
- Diagnostic-centric automation cells.
Diagnostic Capabilities
- Supply voltage monitoring per group.
- Wire-break detection (I < 1 mA).
- External and internal fault LEDs.
- Hardware interrupt generation for event-triggered logic.
FAQ – Frequently Asked Questions
- Can I use 2-wire sensors? Yes, max. quiescent current 3 mA.
- Is the module hot-swappable? Yes, in a redundant system.
- What is the input delay range? 0.05 ms to 3 ms, programmable.
- Does it support wire-break diagnostics? Yes, monitors I < 1 mA.
- What is the isolation voltage? 500 V DC between channels and bus.
Why Buy From Oiltech Controls?
- 15+ years in industrial automation spare parts.
- Global shipment support via FedEx, UPS, DHL.
- Tested industrial surplus and refurbished options.
- 12-month warranty on all products.
- Technical verification before shipment.
- Support for obsolete control systems.
Packaging & Delivery
- Secure anti-static packaging.
- Includes: module, front connector (if ordered), and manual.
- Shipping via FedEx, UPS, or DHL (customer choice).
- Tracking number provided within 24 hours.
For inquiries: info@oiltechcontrols.com | +86 158 8020 0923
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