Function Block RT_BLINK

The Function Block RT_BLINK is a pulse generator. The intervals PT_LOW and PT_HIGH are synchronized with the real-time clock.

Note: The times of the Function Block are absolute. This means that after a restart or server failure, the same reaction occurs.

Note: This Function Block can increase system load as all used intervals are executed at the same time. Otherwise use the Function Block BLINK instead.

Input DIS

The input disables the blinker, resets the internal timer and holds the output Q to false.

Input PT_LOW

Defines the time of the off state in T# for the off time of the output Q. If the input is equal to T#0ms, then the output Q will be false for at least one cycle.

Input PT_HIGH

Defines the time of the on state in T# for the off time of the output Q. If the input is equal to T#0ms, then the output Q will be true for at least one cycle.

Tip: Only defining the input PT_LOW generates a pulse in the interval.

Output Q

The output blinks cyclically, starting with true, after the times PT_HIGH (true) and PT_LOW (false), if DIS is false.

Output ET

The output counts up the time until it expires and the output Q changes. At the start of runtime, the value for one cycle is T#0ms.

Warning: Using the output ET leads to increased PLC load.