Are there bistable elements and flank sensitive elements?

[pretec]

For automatizing the measurement I need bistable elements and positive and negative flank sensitive elements, i.e. when there is a transition from true to false or vice versa the element should give true or false. I didn't find any of those elements.

[johnsold]

You can detect value changes by putting the value into a shift register and comparing the current and previous values. The event structure also has a Value Changed capability.

Lynn