SIMATIC S7-300, digital module SM 323, potential-separated, 8 digital inputs and 8 digital outputs, DC 24V, 0.5A total current 2A, 1x 20-pin. SIMATIC ET 200M is a modular and universally applicable peripheral system for the control cabinet in IP20, which can be used both as central peripheral for an S7-300 and in decentralized configuration with a PROFINET or PROFIBUS ET 200M interface module. Up to 12 I/O modules can be plugged in per station. The standardized design of all modules significantly simplifies logistics and spare parts management. ET 200M is suitable for both standard and safety-related applications. As peripheral modules interfacing with the process, up to 12 high-channel signals can be used, such as 64 digital inputs and function modules, as well as communication processors of the S7-300. Thus, the ET 200M also supports modules with extended payloads, such as HART modules with HART secondary variables. For easy wiring, the ET 200M offers, in addition to conventional connection techniques, the strip-free quick connection technology Fast Connect.