6. Function blocks
6.1 Manufacturer function blocks
6.1.1.6 YT - Year time switch (Year Table)
easyE4 devices feature a real-time clock with a date and time functionality.
When combined with the HW, HY or WT, YT function blocks, this real-time clock
makes it possible to implement the functionality of a weekly timer and year time
switch.
→ Section "Time and Date setting", page 644
The AC manufacturer function block, Astronomic clock, can be used to program
switching operations based on sunrise and sunset times. In order for this to work
properly, the settings for the device clock and the device location's time zone and
geographic coordinates must be correctly selected in this tab.
General
This function block is an enhanced version of the existing HY
- Yearly timer function block.
Base devices provide 32 yearly timer YT01…YT32 (Year
Table).
Year time switches can be used to easily configure unique or
recurring switching events.
The following operating modes are available within this con-
text:
l
Fixed date
l
Fixed date for every year
l
Weekday rule
l
Easter rule
Variable holidays other than Easter cannot be selected.
Operating principle
Each of the 32 year time switches, YT01 through YT32, features eight channels that
can each be configured with an ON event and an OFF event in the parameters for the
function block. All channels act jointly on function block output Q1.
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easyE402/24 MN050009ENEaton.com
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