I am developing a control application which thru a series of calculation the output is a number (int) this number will communicate with a industrial robot (ABB). The number will be a voltage number which will tell the robot to change the power higher or lower. The programming end is done. However my question is I have an I/O card what is the process of converting this integer value ( i written this application is c#) into a voltage signal I have no idea where to start looking for info on this. ANY hint of point me to a right direction would be greate thanks!