Siemens 6ES7323-1BL00-0AA0 S7-300 SM 323 Module

Siemens 6ES7323-1BL00-0AA0 is a SIMATIC S7-300 digital I/O module (SM 323) with galvanic isolation that provides 16 digital inputs and 16 digital outputs for 24 V DC operation. The module's outputs are rated 0.5 A per channel, for a total module current of 4 A, and it connects to the S7-300 rack via a single 40-pin backplane interface. The SM 323 is designed to extend discrete I/O in SIMATIC S7-300 systems, enabling direct sensing and actuation of field devices such as sensors, switches, and relays in industrial environments. With 24 V DC compatibility and isolation between the field side and the controller, it helps protect the CPU from voltage transients and wiring faults while delivering straightforward ladder logic or function block programming for automation tasks. This model is typically used in manufacturing lines, packaging equipment, and process control where compact, reliable I/O expansion is needed and where the standard 40-pin attachment is part of the circuit architecture.