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. |
|
PDT |
DT |
Preset date and time |
|
|
Output |
Q |
BOOL |
TRUE as long as CDT is counting |
|
CDT |
DT |
Date and time, elapsed since PDT |
