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`