About Siemens S7-300 16DI Expansion Module

 The Siemens S7-300 16DI Expansion Module is a reliable and versatile industrial automation accessory designed for seamless integration into existing systems. This expansion module boasts a sleek black color and is constructed from high-quality polycarbonate material, ensuring durability and longevity. With an IP Rating of 20, it provides adequate protection against dust and moisture, making it suitable for various industrial environments. Operating at a frequency of 50/60 Hertz, this module offers consistent performance. The rack mount design and standard size allow for easy installation and compatibility with different setups.

SIMATIC S7-300 SM 321 Digital Input Module

Article No.: 6ES7321-1BH02-0AA0
Type: Isolated, 16 DI, 24 V DC
Connection: 1x 20-pin front connector

Supply Voltage

• Rated: 24 V DC

• Permissible range: 20.4 28.8 V DC

Backplane Bus:

• 5 V DC, max. 10 mA

Power Loss:

• Typ.: 3.5 W

Digital Inputs

• Number: 16

• Input characteristic: IEC 61131, Type 1

• Simultaneously controllable inputs:

  • Horizontal: max 16 (up to 60 C)

  • Vertical: max 16 (up to 40 C)

• Input voltage: 24 V DC

  • Signal "0": -30 to +5 V

  • Signal "1": 13 to 30 V

• Input current for "1": typ. 7 mA

• Input delay:

  • "0""1": 1.24.8 ms

  • "1""0": 1.24.8 ms

Cable Length:

• Shielded: max. 1000 m

• Unshielded: max. 600 m

Encoder Support

• 2-wire sensor: Yes

• Max permissible quiescent current: 1.5 mA

Diagnostics / Status

• Status indicator LED (green) for digital input: Yes

• Diagnostic alarm: No

• Hardware interrupt: No

Isolation

• Between channels: No

• Between groups of 16 channels: Yes

• Between channels and backplane bus: Yes (Optocoupler)

• Tested isolation: 500 V DC

Mechanical Data

• Width: 40 mm

• Height: 125 mm

• Depth: 120 mm

• Weight: 200 g 

Technical Details