Chapter 6 FBD Block Diagram Programming 179
(6) Real-time clock mode 5 (astronomical clock)
RTC mode 5 is astronomical clock mode, using the set latitude and longitude, offset time, to control the output of the
RTC coil. The following figures and tables illustrate the display form and parameter meaning of RTC mode 5 and the
programming interface in FBD mode.
Set E/W(east and west longitude) and longitude values as well as S/N(south and north latitude) values. The RTC
function block will calculate the sunrise and sunset time of the current season at the set location. By setting the offset
direction, the sunrise and sunset time can be set to move forward (-) or backward (+) at the same time
(0~59min).The R coil will output ON after sunrise to before sunset, and OFF the rest of the time.
※ Calculate sunrise and sunset time according to the current value of RTC. Set R01 ON after sunrise and before
sunset time.
※DRCE and DRCF are special registers, which can store the sunrise, sunset and time calculated by longitude and
latitude (excluding offset).
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