Digital Module 32DI

The Siemens 6ES7321-1BL00-0AA0 is a SIMATIC S7-300 Digital Input Module (SM 321), providing 32 optically isolated digital inputs for robust and 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 sensors.

• Inputs: 32 digital inputs, optically 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 Voltage for Signal "1": 13–30 V

• Input Voltage for Signal "0": -30 to +5 V

• Input Delay:

  • "0" to "1": min. 1.2 ms, max. 4.8 ms

  • "1" to "0": min. 1.2 ms, max. 4.8 ms

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

• Power Loss: Typical 6.5 W

• Galvanic Isolation: Between input groups and backplane bus (optocoupler)

• Cable Length:

  • Shielded: max. 1,000 m

  • Unshielded: max. 600 m

• Encoder Compatibility: Supports 2-wire sensors (max. permissible quiescent current: 1.5 mA)

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

• Connector: 1 x 40-pole front connector

• Diagnostics: Status LED for each input; no diagnostic alarms or hardware interrupts

• Standard Compliance: IEC 61131, Type 1 digital input

This module is ideal for high-density digital input applications requiring reliable signal acquisition and robust isolation in demanding industrial settings.