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Siemens 6ES7321-1BH02-0AA0 SM321 Digital Input Module
The Siemens 6ES7321-1BH02-0AA0 is a SIMATIC S7-300 SM321 digital input module. It features 16 channels at 24V DC with optoelectronic isolation.
Description
The Siemens 6ES7321-1BH02-0AA0 is a high-density digital signal acquisition module for the SIMATIC S7-300 PLC range. This SM321 unit provides 16 isolated digital input channels to monitor industrial sensors and switches. Because it utilizes 24V DC sinking logic, the module integrates easily with most standard field devices. Its robust electronic design ensures precise signal detection even in high-interference factory environments. This module remains a reliable choice for existing automation systems requiring discrete signal monitoring.
Technical Specifications
| Feature | Specification Detail |
| Model Number | 6ES7321-1BH02-0AA0 |
| Manufacturer | Siemens |
| Number of Inputs | 16 Digital Inputs |
| Rated Input Voltage | 24 V DC |
| Input Characteristic | Type 1 (IEC 61131) |
| Isolation | Optoelectronic (Between bus and load) |
| Current Consumption | 10 mA (from backplane bus) |
| Power Loss | Typical 3.5 W |
| Dimensions | 40 x 125 x 120 mm |
Signal Integrity and Protection Features
This SM321 module prioritizes data accuracy through advanced optoelectronic isolation. Consequently, the controller remains protected from external electrical surges and ground loops. Front-panel LED indicators provide real-time status for each of the 16 input channels. These visual cues simplify on-site diagnostics and wiring verification for maintenance personnel. Furthermore, the unit supports flexible input delay settings to filter out mechanical contact bounce. This capability ensures the PLC only processes valid signal changes during high-speed operations.
Deployment and Space Optimization
The compact 40mm housing width allows for maximum channel density on the S7-300 mounting rail. This space-saving design reduces the overall footprint of the control cabinet. Engineers can install the module quickly using the standard 20-pin front connector. Additionally, the unit operates reliably within a broad temperature range for diverse climate conditions. It serves effectively in industries such as material handling, food processing, and automotive assembly. The 6ES7321-1BH02-0AA0 ensures long-term operational stability for critical manufacturing processes.
Key Functional Characteristics
- Supports 16 digital input channels for comprehensive sensor monitoring.
- Utilizes 24V DC logic for compatibility with standard industrial switches.
- Provides galvanic isolation to shield internal PLC circuits from noise.
- Includes per-channel status LEDs for rapid visual diagnostics.
- Features a modular design for easy replacement and system expansion.
- Operates efficiently with low power loss to prevent cabinet overheating.
- Connects via a 20-pin front connector for secure and organized wiring.
Additional information
| Weight | 0.18 kg |
|---|---|
| Country of Origin | Germany |
| Dimension | 4 x 11.7 x 12.5 cm |
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