Logic Solver Off Delay Timer function block

The LSOFFD function block delays the transfer of a False (0) discrete input value to the output by a specified time period. The block supports signal status propagation. There are no modes or alarm detection in the Off-Delay Timer function block.

Figure: LSOFFD Function Block

IN_D is the discrete input value and status used to trigger the timed discrete output value.

OUT_D is the discrete output value and status.

The Off-Delay Timer function block immediately transfers the discrete input value (IN_D) to the output (OUT_D) and resets the ELAPSED_TIMER when IN_D is True (1). When IN_D transitions to False (0), OUT_D is reset to False after a specified time period (TIME_DURATION). During this time period, ELAPSED_TIMER tracks the time starting when IN_D transitions to False until the time specified by TIME_DURATION expires.

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

Figure: LSOFFD Function Block Schematic Diagram