RTC (FB)

FUNCTION_BLOCK RTC

Calculates the elapsed time since a given start time

Usage Examples:

This function block can be used as an operation hour counter, when PDT is set to DT#1970-01-01-00-00:00, or is simply not connected.
This function block can be used to return the current date and time, by adjusting the FB to the current local time. Just, set the input PDT to the current local time, on the rising edge of EN.

Note

This counter will have an overflow at the 7th February, 2106.

(* Example in ST *)
RTC(EN:=VarBOOL1, PDT:=DT#2006-03-30-14:00:00, Q=>VarBOOL2, CDT=>VarTimeCur);

InOut:

Scope	Name	Type	Comment
Input	EN	BOOL	Rising edge: CDT is set to PDT and CDT starts increasing. Falling edge: CDT is set to DT#1970-01-01-00:00:00.
Input	PDT	DT	Preset date and time
Output	Q	BOOL	TRUE as long as CDT is counting
Output	CDT	DT	Date and time, elapsed since PDT