6. Function blocks
6.1 Manufacturer function blocks
6.1.1.8 AC - Astronomic clock
Only available on easySoft Version 7.10 or higher.
If this function block is not being shown in the leftmost pane in easySoft 8, make sure
that you are using firmware version 1.10 or higher for the project.
General
easyE4 base devices provide 32 astronomic clock function
blocks, AC01 through AC32. Output Q1 in these function blocks
is switched on during the time between sunrise and sunset.
Operating principle
The astronomic clock function block calculates both sunrise and sunset times based
on the geographical position of the device's location and the current device time
(both need to be entered in order for the function block to work correctly). The device
location can be set in the Project view/Clock tab, while the device time can be
checked and changed directly on the device or in the Communication view/Clock sec-
tion.
The astronomic clock function block is meant for use in latitudes of -65 to +65.
Please note that the sunrise and sunset time calculations will be too inaccurate out-
side of this range (at a latitude of 60, the times will be inaccurate by up to 5 minutes;
at a latitude of 65.7, the times will be inaccurate by about 12 minutes).
A time offset for the sunrise time and the sunset time can be set at function block
inputs O1 and O2 respectively. This means that the time when Q1 will be switched
can be moved up or delayed in order to, for example, account for a heating system's
lag and post-run times.
If a daylight saving time has been set up in the Project view/Clock tab, this setting
will also be taken into account when switching function block output Q1.
The function block inputs' and function block outputs' resolution is in minutes.
Time zone data changed at runtime will immediately affect the function block's beha-
vior accordingly.
The device location and device time must be cor-
rectly specified.
easyE402/24 MN050009ENEaton.com
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