Control & Measurement EUPP Modules - Digital Output Board (Isolated) The main board contains three digital output ports, each port provides 8 digital output bits. Each port can be linked to a digital output (isolated) board via a 10 way ribbon cable. The output board provides the digital output function via FET transistors which are capable of switching up to 30V at 8A (additional heat sinking will be required to enable the transistor to switch 8A). The digital outputs are accessed via a 15 way D-type  socket connector. Full isolation is provided with on board opto-isolation and on board power supply which develops on board control voltages from a plant side DC supply (7V to 30V).