Creates random on and off signals with varying delay times.
The random controller is triggered with a rising edge at input En. When En is active the on delay time before Q is activated is between 0 and TH and is randomly chosen.
If the output is active and the input En is disabled, the output Q is disabled after a random time between 0 and TL. If Enis triggered again during the off delay count Q is reset and the new state on is used.
The block can be set to be retentive, this is done by clicking on the battery symbol to set the red NOT dot on the block (input is by default inactive).