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LD Language Elements
SR2MAN01 11/2007 101
Timers
Description Use the Timers function to delay, prolong and control actions over a predetermined
period. Durations can be set using one or two preset values, according to the type
of timer.
There are 11 types of timers:
z On delay (A),
z On delay, stop by reset (A),
z Off delay (C),
z On pulse one shot: Pulse calibrated on the command input (B) falling edge.
z Timing after pulse: calibrated on falling edge of the command input (W),
z Flasher unit, control held down synchronously (D),
z Flasher unit, Press to start/stop, Synchronous (D),
z Time on addition (T),
z A/C,
z Flasher unit, control held down asynchronously (L),
z Flasher unit, Press to start/stop, Asynchronous (I),
Refer to the Timing Diagrams paragraph for the description of different types of
timers.
The smart relay has 16 timer function blocks, numbered from 1 to 9 then from A to G.
Each block has a reset input, a command input and an output used to indicate timer
time-out.