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Siemens 6ES7321-1BH50-0AA0 Digital Input Module
The Siemens 6ES7321-1BH50-0AA0 is a 16-channel digital input module for S7-300 PLCs. It operates at 24V DC with source-input logic and galvanic isolation for reliable signal acquisition.
Description
The Siemens 6ES7321-1BH50-0AA0 is a specialized SM 321 digital input module for the SIMATIC S7-300 PLC series. This component facilitates the acquisition of binary signals from field sensors and switches. Because it utilizes source input logic, the module accommodates specific wiring requirements in complex electrical systems. The hardware excels in high-density control cabinets where reliable signal processing remains critical. Consequently, this module serves as a bridge between physical machine states and the controller logic.
Technical Specifications
| Parameter | Technical Detail |
| Model Number | 6ES7321-1BH50-0AA0 |
| Total Digital Inputs | 16 |
| Input Logic | Source Input (PNP) |
| Rated Load Voltage | 24V DC |
| Permissible Voltage Range | 20.4V to 28.8V DC |
| Power Loss (Typical) | 3.5 W |
| Front Connector | 20-pole |
| Weight | 0.3 kg |
| Dimensions (W x H x D) | 40 x 125 x 120 mm |
Functional Capabilities and Integration
The module processes signals across 16 channels with complete galvanic isolation from the backplane bus. This feature protects the CPU from external electrical interference or voltage surges. Furthermore, the compact 40mm width allows for efficient rail mounting and system expansion. Installation requires a standard 20-pole front connector to secure the field wiring. Since the module belongs to the established S7-300 family, it maintains full compatibility with standard mounting rails and bus connectors.
Industrial Applications
The 6ES7321-1BH50-0AA0 module performs effectively in diverse automation sectors. It typically monitors limit switches, photoelectric sensors, and manual pushbuttons. Due to the rugged German engineering, the unit withstands the vibration and temperature fluctuations of factory floors. Additionally, the low power consumption helps maintain low temperatures within the enclosure. This efficiency contributes to the overall longevity of the PLC system.
Key Technical Features
- Supports 16 discrete digital inputs for high-density signal monitoring.
- Utilizes source-switching logic to meet specific industrial wiring standards.
- Operates on a standard 24V DC power supply for industrial safety.
- Includes status LEDs on the front panel for rapid channel diagnostics.
- Features a fanless and maintenance-free design for reduced operational costs.
- Integrates seamlessly via the SIMATIC STEP 7 or TIA Portal software.
Additional information
| Weight | 0.3 kg |
|---|---|
| Country of Origin | Germany |
| Dimension | 12.7 x 2.5 x 12.7 cm |
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