SIS function blocks > SIS Logical Blocks

Logic Solver Positive Edge Trigger function block

The LSPDE function block generates a True (1) discrete output when the discrete input makes a positive (False-to-True) transition since the last execution of the block. If there has been no transition, the discrete output of the block is False (0).

The LSPDE function block supports signal status propagation. There are no modes or alarm detection in the block.

Figure: LSPDE Function Block

IN_D is the discrete input value and status.

OUT_D is the discrete output value and status.

The following figure shows the internal components of the function block:

Figure: LSPDE Function Block Schematic Diagram