Description
The Siemens SIMATIC S7-300 SM321 Digital Input Modules are robust signal conditioning units designed for industrial automation systems. These modules convert external digital signals from sensors and switches into internal logic levels for the PLC controller. Featuring high noise immunity and electrical isolation, they ensure reliable operation in harsh industrial environments. With LED status indicators for each channel and pluggable front connectors for easy wiring, these modules offer flexibility for various automation tasks. They are compatible with standard switches, pushbuttons, and proximity sensors (BEROs).
Key Features
- Digital Input Module with various voltage ratings (DC 24V, AC/DC 24-48V, DC 48-125V, AC 120/230V)
- Input Configuration: 16 or 32 channels depending on model
- Electrical Isolation: Between channels and backplane bus for safety and noise immunity
- Connection Type: 20-pin or 40-pin front connector (plug-in type)
- Protection Rating: IP20 (protects against solid objects >12.5mm)
- Country of Origin: Germany
Technical Specifications
- Supply Voltage: 24V DC or 120/230V AC depending on model
- Current Consumption: Typically 5-100 mA from backplane bus
- Power Loss: 1.5W to 9W depending on model
- Input Delay: Typically 0.1ms to 16ms (fast response for standard inputs)
- Cable Length: Up to 1000m shielded, 600m unshielded
- Dimensions: 40mm x 125mm x 120mm (W x H x D) for standard modules
- Weight: Approximately 260g to 340g
Warranty & After-Sales
- Factory new units: 12 months warranty
- Refurbished units: 3-6 months warranty
- Technical support for configuration and installation
- Wiring and mounting assistance
- Compatibility verification with existing systems
- Commissioning and diagnostics support available
Delivery Time
- Standard delivery: 3-5 working days
- Express shipping available upon request
Why Choose Our Store
- Genuine Siemens components
- Global supply network with competitive pricing
- Expertise in industrial automation systems
- Comprehensive technical documentation
- Responsive customer service and support
Applications
- Machine control and automation
- Process control systems
- Material handling and conveyor systems
- Packaging machinery
- Building automation
- Quality control and inspection systems
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