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| Place of Origin: | U.K. |
| Brand Name: | Siemens |
| Certification: | COO & COC |
| Model Number: | 6ES7221-1BH22-0XA8 |
6ES7221-1BH22-0XA8 SIEMENS SIMATIC S7-1200 digital input module features 16-point leakage type input
The Siemens SIMATIC S7-1200 digital input module 6ES7221-1BH22-0XA8 is a high-density, high-performance 16-channel digital input expansion module, specifically designed for leaky (NPN) sensor systems. This module can reliably collect low-level effective signals from devices such as proximity switches, photoelectric sensors, buttons, and limit switches, and is widely used in scenarios such as electronic manufacturing, packaging machinery, material handling, and test platforms mainly featuring Japanese, Korean, or domestic automated equipment.
Product Overview: Siemens 6ES7221-1BH22-0XA8
| Order Number | 6ES7221-1BH22-0XA8 |
| Series | SIMATIC S7-200 |
| Module Type | Digital Input (DI) Expansion Module |
| Number of Inputs | 16 channels |
| Input Voltage | 24 V DC (nominal), operating range 15–30 V DC |
| Sensor Compatibility | Supports both NPN (sinking) and PNP (sourcing) configurations |
| Input Filter Delay | Approximately 2.5 ms (for noise immunity in electrically harsh environments) |
| Connection Type | Two removable 8-pin screw terminal blocks (Phoenix-style) |
| Mounting | Snap-on design—connects directly to the right side of S7-200 CPUs or other expansion modules |
| Dimensions (W × H × D) | 71.2 mm × 80 mm × 62 mm |
| Power Consumption | Draws ~50 mA from the CPU’s internal 5 V DC bus |
| Operating Temperature | 0°C to +55°C |
| Isolation | Optocoupler isolation between field wiring and internal logic |
Typical applications
6ES7221-1BH22-0XA8, with its unified NPN architecture and high channel density, performs exceptionally well in the following areas:
Electronic assembly and SMT production line: Connect a large number of NPN optical fibers/photoelectric sensors to monitor the position of components and the status of tracks.
Product details pictures
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