So there is no way to do any kind of true random output in Starmade logic. The best we can do as far as I know is simulate a random output based on the timing of clocks but this only works with a manual input as any timed circuit will always have the timing match at some point.
The Randomizer block when it receives a High signal will output a High signal randomly to one of it's connected blocks while the others stay Low. When the signal goes Low again all the outputs will return Low.
The Randomizer block when it receives a High signal will output a High signal randomly to one of it's connected blocks while the others stay Low. When the signal goes Low again all the outputs will return Low.