Product details
Siemens SM 321 Digital Input Module: Reliable 16-Channel Control
Powergear X Automation brings you the 6ES7321-7BH01-0AB0 digital input module. This Siemens SM 321 unit offers 16 isolated channels. It works with 24V DC signals for industrial automation. The module supports process interrupts and diagnostics. Perfect for precise control applications.
Key Product Features
- 16 digital inputs with 24V DC rating
- Full isolation between inputs and backplane
- Process interrupt capability included
- Diagnostic functions for easy maintenance
- Isochronous mode compatible operation
- Wire-break detection for each channel
- Reverse polarity protection built-in
Technical Specifications
- Supply Voltage: 24V DC (20.4-28.8V range)
- Input Current: 7mA typical at signal “1”
- Power Consumption: 4W typical loss
- Input Delay: 0.1 to 20ms configurable
- Cable Length: 1000m shielded maximum
- Operating Temperature: Up to 60°C
- Module Weight: Approximately 200 grams
Electrical Characteristics
- Signal “0” Range: -30V to +5V DC
- Signal “1” Range: 13V to 30V DC
- Backplane Current: 130mA maximum at 5V DC
- Encoder Supply: 2 outputs at L+ (-2.5V)
- Output Current: 120mA rated per channel
- Isolation Test: 500V DC verified
Installation & Connectivity
- Mounting: Standard S7-300 rail mounting
- Connector: 20-pin front connector required
- Dimensions: 40mm x 125mm x 120mm
- Grouping: 16 channels in one group
- Indicators: SF red, DI green, Vs green LEDs
- Sensors: Compatible with 2-wire types
Diagnostics & Monitoring
- Parameterizable diagnostic alarms
- Configurable hardware interrupts
- Wire-break detection capability
- Group error display via SF LED
- Encoder supply status indication
- Input status per channel monitoring
Professional Applications
- Machine automation systems
- Process control installations
- Manufacturing equipment monitoring
- Industrial safety systems
- Production line automation
- Equipment status monitoring
Frequently Asked Questions
- What sensors work with this module?
- It works with standard 2-wire sensors up to 2mA quiescent current.
- How do I configure input delays?
- Use Step 7 software to set delays from 0.1ms to 20ms.
- Can I use unshielded cables?
- Yes, up to 600 meters with proper installation.
- What indicates a wire break?
- The diagnostic function detects currents below 1mA.
- Is module replacement difficult?
- No, use the 20-pin connector for easy replacement.
Shipping & Warranty
- Warranty Period: 12 months from purchase
- Shipping Methods: FedEx, UPS, DHL available
- Delivery Time: 3-5 business days typically
- Package Includes: Module and documentation
Contact Our Experts
- Email: sales@powergearx.com
- Phone: +86 18030005825
- Partner: Ubest Automation Limited
Copyright © 2025 Powergear X Automation Limited. All rights reserved.
Original Source: https://www.powergearx.com/
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