SIS function blocks > SIS Logical Blocks > Logic Solver Set/Reset Flip-flop function block

Logic Solver Set/Reset Flip-flop function block execution

The LSSR function block is used to detect a change in the set input (SET). When the reset input (RESET_IN) is False, OUT is set True after SET changes to True. OUT remains True, even when SET returns to False, and remains True until RESET_IN is changed to True and SET is False.

The following table shows the block output value based on the possible SET and RESET_IN combinations:

Table: LSSR Function Block Output Values

SET

RESET_IN

OUT

False

False

Last OUT

False

True

False

True

False

True

True

True

True