KEI300634 is a digital input/output (I/O) module manufactured by Etal. It is a four-channel digital I/O module designed for industrial automation applications using a single 24 VDC power supply. It features four opto-coupled digital inputs and four Form C relay outputs. The inputs support a variety of connection options including NPN, PNP, pushbutton, and potential-free contact connections. It supports multi-channel grouping, enable inputs, and pulse outputs. The KEI300634 is CE certified and supports a variety of protocols including Modbus RTU, EtherNet/IP, Profibus-DP, and Profinet. It also supports various safety protocols such as SIL2, STO, and SafeTorqueOff.