SIEMENS S7-300 series 6ES7323-1BL00-0AA0 digital module is a digital input and output module suitable for industrial automation control system. It has 8 digital inputs and 8 digital outputs, adopts photoelectric quarantine technology, supports 24 V DC power supply, the maximum collector current is 0. 5 a, and the maximum single load current is 2 A. This module is widely used in manufacturing, process control and building automation.