Weekly timer

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Caution

Your LOGO! must be equipped with an internal real-time clock if you are going to use this SFB.

Short description

The output is controlled by means of a configurable on/off date. The function supports any combination of weekdays.

 

Connection

Description

Parameters No1, No2, No3

At the No1, No2, No3 (Cam) parameters you set the on- and off-time triggers for each cam of the weekly timer. For each Cam you specify the day of the week and the time of day for the on- and off-times.

Par

You specify whether the timer pulses on for one cycle when activated and is then reset. The pulse parameter applies to all three cams.

Output Q

Q is set when the configured cam is actuated.

Timing diagram (three practical examples)

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No1:  Daily:   06:30 h to 8:00 h

No2:  Tuesday:  03:10 h to 04:15 h

No3:  Saturday and Sunday: 16:30 h to 23:10 h

Description of the function

Each weekly timer is equipped with three cams. You can configure a time hysteresis for each individual cam. At the cams you set the on- and off-hysteresis. The weekly timer sets the output at a certain time, provided it is not already set.

The weekly timer resets the output at the off-time if you configured an off-time, or at the end of the cycle if you specified a pulse output. A conflict is generated in the weekly timer when the on-time and the off-time at another cam are identical. In this case, cam 3 takes priority over cam 2, while cam 2 takes priority over cam 1.

The switching status of the weekly timer is determined by the status at the No1, No2 and No3 cams.

On-times

The on-time is any time between 00:00 h and 23:59 h. You can also configure the on-time to be a pulse signal. The timer block will be activated at the specified time for one cycle and then the output is reset. The off-time is disabled in this case as it is not applicable.

Special characteristics to note when configuring

The block properties window offers a tab for each one of the three cams. Here you can set the day of the week for each cam. Each tab offers you in addition an option of defining the on- and off-times for each cam in hour and minute units. Hence, the shortest switching cycle is one minute. Also on each tab you have the option of specifying a pulse output for the cam.

You can disable the on- and off-times individually. You can achieve switching cycles extending across more than one day, for example, by setting the on-time for cam 1 to Monday 7:00 h and the off-time of cam 2 to Wednesday 13:07 h, while disabling the on time for cam 2.

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The Pulse setting is available only as of the 0BA6 device series.

Backup of the real-time clock

The internal real-time clock of LOGO! is buffered against power failure. The buffering time is influenced by the ambient temperature, and is typically 80 hours at an ambient temperature of 25°C.

The LOGO! 0BA6 devices and later support the option of a battery card or a combined program module (memory) and battery card. The real-time clock is buffered for several years with either of these cards.

Overview