Siemens 6ES7321-7BH01-0AB0: Reliable Digital Input Module

This 6ES7321-7BH01-0AB0 module brings smart control to your automation system. It reads signals from sensors and switches efficiently. The module fits perfectly in SIMATIC S7-300 PLC racks. You get sixteen isolated digital inputs in one compact unit.

Quick Setup Guide

• Easy installation in S7-300 PLC systems
• Simple wiring with 20-pin front connector
• Fast configuration through STEP 7 software
• Quick diagnostics with LED status indicators

Main Specifications

• Brand: Siemens
• Series: SIMATIC S7-300
• Module Type: Digital Input SM 321
• Part Number: 6ES7321-7BH01-0AB0
• Input Channels: 16 isolated inputs
• Voltage Rating: 24V DC operation
• Input Current: 7 mA per signal
• Power Usage: 4W typical loss

Electrical Characteristics

• Supply Voltage: 20.4V to 28.8V DC range
• Signal Detection: 13-30V for "1", -30 to +5V for "0"
• Backplane Current: 130 mA maximum at 5V
• Encoder Supply: 2 outputs at 120 mA each
• Wire-break Detection: 10-18 kΩ monitoring
• Cable Length: 1000m shielded, 600m unshielded

Advanced Features

• Process interrupt capability for fast response
• Diagnostic functions with parameter settings
• Hardware interrupts for critical events
• Wire-break detection for maintenance
• Suitable for isochronous operation mode
• Reverse polarity protection on inputs
• LED status indicators for all channels

Physical Details

• Dimensions: 40 x 125 x 120 mm
• Weight: Approximately 200 grams
• Connector: 20-pin front connection
• Mounting: S7-300 standard rail
• Isolation: 500V DC tested

Environmental Ratings

• Temperature Range: 0°C to 60°C operation
• Installation: Horizontal or vertical mounting
• Pollution Degree: Level 2 protection
• Safety Standards: IEC 61131 compliant

Package Contents

• One Siemens 6ES7321-7BH01-0AB0 module
• Complete documentation package
• Quality inspection certificate
• Protective shipping materials

Shipping Information

• Fast worldwide delivery available
• Professional packing for safety
• FedEx, UPS, DHL express options
• Order tracking provided
• 12-month product warranty

Common Questions

• Can this module work with 2-wire sensors?
• Yes, it supports 2-wire sensors with 2mA maximum quiescent current.
• What cable length can I use safely?
• You can use up to 1000 meters with shielded cable for best results.
• How do I set input delay times?
• Configure delay from 0.1 to 20ms through software parameter settings.
• Does it need external power supply?
• It gets power from backplane but needs 24V DC for input signals.
• What indicates module problems?
• Red SF LED shows errors, green LEDs show input status clearly.

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