Wireless I/O: Type - Analog/Digital Extension Module; Inputs - 1 Analog Current Input, 2 Digital Inputs; Input Values - 4-20 mA; Outputs - 1 Analog current Output, 2 Digital Relay Outputs; Output Values - 700 ohm; Mounting - DIN rail NS 35; Additional Information - Extension modules can be connected to this system toadapt the number of signals to be transmitted digital oranalog to the requirements.