The Siemens 6ES7321-1BH50-0AA0 is a specialized digital input module for the SIMATIC S7-300 PLC series. This unit provides 16 discrete input channels for monitoring industrial field devices. It functions primarily as a source-input interface for 24V DC logic signals. Consequently, it effectively bridges sensors and switches with the central processing unit. The module ensures precise data collection for complex automation tasks.
Reliable Design and Electrical Protection
This SM 321 module features galvanic isolation to protect internal PLC circuits. This isolation prevents electrical noise and surges from damaging the controller. Furthermore, the unit supports a standard operating voltage range from 20.4V to 28.8V DC. A low power loss of approximately 3.5W minimizes heat generation within the cabinet. Therefore, the module maintains high stability during continuous 24-hour industrial operations.
Efficient Installation and Maintenance
The compact hardware design optimizes space on the S7-300 mounting rail. It requires a standard 20-pole front connector for all wiring terminations. This standardized connection simplifies the installation process for control cabinet builders. Additionally, the module includes front-facing status LEDs for each channel. These indicators allow technicians to diagnose signal presence quickly during routine maintenance.
Technical Specifications
| Feature | Details |
| Manufacturer | Siemens |
| Part Number | 6ES7321-1BH50-0AA0 |
| Number of Inputs | 16 Channels |
| Input Type | Source Input (Sinking Load) |
| Rated Load Voltage | 24V DC |
| Isolation | Galvanic isolation per group |
| Power Loss | 3.5 W (Typical) |
| Connector Type | 1 x 20-pole |
| Weight | 0.20 kg |
| Dimensions | 40 x 125 x 120 mm |
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