Siemens 6ES7 323-1BL00-0AA0 is a SIMATIC S7-300 digital input/output module (SM323) that provides 16 digital inputs and 16 digital outputs at 24 V DC. The module is electrically isolated in two groups of 16, with DO outputs rated at 0.5 A per channel (total DO current 4 A) and DI inputs designed for 24 V DC signals. It interfaces to the S7-300 rack via a 1×40-pole backplane connector, enabling compact expansion of I/O. Typical applications include expanding a 24 V digital I/O network for machine control, packaging lines, and automation processes when used with a compatible SIMATIC S7-300 controller.
