Digital Input Module 16 DI

The Siemens 6ES7321-1BH02-0AA0 is a SIMATIC S7-300 Digital Input Module (SM 321), providing 16 optically isolated digital inputs for reliable signal acquisition in industrial automation environments. This module is designed for 24 V DC operation and supports a wide range of field devices, including switches and proximity sensors (BEROs).

• Inputs: 16 digital inputs, isolated in groups of 16

• Input Voltage: 24 V DC (permissible range: 20.4–28.8 V DC)

• Input Current: Typical 7 mA per input (for signal "1")

• Input Delay: 0.05 ms (for signal "0" to "1" transition)

• Mounting: 1 x 20-pole front connector

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

• Weight: Approx. 260 g

• Power Consumption: From backplane bus (5 V DC), max. 15 mA

• Power Loss: Typical 2 W

• Isolation: Between channels and backplane bus (optocoupler)

• Compatibility: Suitable for two-, three-, and four-wire proximity switches

• Cable Length:

  • Shielded: max. 1,000 m

  • Unshielded: max. 600 m