About SIEMENS PLC SM321 6ES7321-1BH02-0AA0

The Siemens PLC SM321 6ES7321-1BH02-0AA0 in black color is ideal for industrial use, operating on electric power mode. This new PLC comes in a standard size with a 1-year warranty, ensuring reliability and performance. Trusted by exporters, manufacturers, suppliers, and traders, this PLC is designed for seamless integration into various industrial applications. 

Siemens SIMATIC S7-300 SM 321 Digital Input Module

Article No: 6ES7321-1BH02-0AA0

General Information

• Module Type: SM 321, Digital Input

• Number of Inputs: 16 (Isolated, 24 V DC)

• Connection: 1x 20-pin front connector

Supply Voltage

• Rated Voltage L+: 24 V DC

• Permissible Range: 20.4 28.8 V DC

Current & Power

• Input Current: Max. 10 mA (from backplane bus 5 V DC)

• Power Loss: Typ. 3.5 W

Digital Input Specifications

• Input Voltage Type: DC

• Rated Input Voltage: 24 V

• Signal 0: -30 to +5 V

• Signal 1: 13 to 30 V

• Input Current for Signal 1: Typ. 7 mA

• Number of Controllable Inputs: Max. 16 (horizontal 60 C / vertical 40 C)

• Input Delay (at rated voltage):

  • 0 1: 1.2 4.8 ms

  • 1 0: 1.2 4.8 ms

• IEC 61131 Input Characteristic Curve: Type 1

Encoder Support

• Connectable Encoders: 2-wire sensor

• Permissible Quiescent Current: Max. 1.5 mA

Cabling

• Max Cable Length:

  • Shielded: 1,000 m

  • Unshielded: 600 m

Diagnostics & Indicators

• LED Status Indicator: Yes (green)

• Alarms / Diagnostics: None

Isolation & Potential Separation

• Between Channels: No

• Between Groups of 16 Channels: Yes

• Between Channels and Backplane Bus: Yes (Optocoupler)

• Isolation Test Voltage: 500 V DC

Physical Data

• Dimensions: 40 mm (W) x 125 mm (H) x 120 mm (D)

• Weight: 200 g 

Technical Details