The Day of the Month function block is used for date functions, e.g. 14th and 21st of a month.
The Direct Day of the Month function block has thirty-one boxes for the thirty-one possible days of a month.
If the RTC coincides with a selected day of the month: power will flow through the function block.
If the RTC does not coincide with a selected day of the month: power will not flow through the function block.
According to the above example:
On the 7th, 14th, 21st and 28th the function block's output will be to logic "1" (ON).
On the other days of the month the function block's output will be logic "0" (OFF).
The Indirect Day of the Month function comprises:
Indirect Day of the Month function block
Time Function Variable in Day of the Month format (CD)
Display for entering values
The Indirect Day of the Month function values are entered by the user utilizing
Up and Down scroll arrow keys for scrolling through the days of the month
+/- keys for selecting the desired days of the month
Enter key for confirming selection
The Indirect Day of the Month function values are entered into two MIs to create 31-bit bitmap in the linked MIs.
According to the above example:
On the 12th, 14th, 19th, 21st and 28th of the month the function block's output will be logic "1" (ON).
On the other days of the month the function block's output will be to logic "0" (OFF).