User Manual

LOGO! functions
4.4 Special functions list - SF
LOGO!
Manual, 06/2014, A5E33039675
159
4.4.11
Weekly timer
Short description
The weekly timer controls an output by means of a configurable on/off date. The function
supports any combination of weekdays. You select the active weekdays by hiding the
inactive days.
Note
Because LOGO! 24/24o does not have a real
-time clock, the weekly timer function is not
available.
Symbol in LOGO!
Wiring
Description
Cam parameters
1, 2 and 3
At the Cam parameters, you set the on- and off-times of the
weekly timer for each
Cam
switch. Here you also configure
the days and the time-of-day.
You can also specify whether the timer pulses on for one
cycle when activated and then reset. The pulse setting
applies to all three cams.
Output Q
LOGO! sets Q when actuating the configured cam.
Timing diagram (three examples)
Functional description
Each weekly timer has three cams for you to configure a time hysteresis. You specify the on-
and off-times at the Cam parameters. The weekly timer sets the output at a certain on-time;
if you have not set it, the weekly timer resets the output at a certain off-time if you configure
an off-time, or at the end of the cycle if you specify a pulse output.
You will cause a conflict if you set overlapping on- and off-times; the earliest on- and off-
times take priority. Here is an example:
Cam
On-time
Off-time
1 1:00h 2:00h