Chapter 8 Logic Instructions 
8-49 
 
FB/FC 
FB 
Sys_ReadTime reads the time of the real-time clock of the controller.   
Sys_ReadTime
Enable Done
Sys_ReadTime_instance
Year
Month
Day
Week
Hour
Second
Minute
 
  Input Parameter 
Parameter name  Function  Data type 
Validation timing 
Enable 
executed when Enable 
changes from FALSE to 
BOOL 
TRUE or FALSE 
(FALSE) 
When Enable is 
TRUE.   
  Output Parameters 
Function  Data type  Valid range 
Done 
TRUE when the instruction execution is 
completed. 
BOOL  TRUE/FALSE 
Year  Year  UINT  1970~2106 
Month  Month  UINT  1~12 
Day  Day  UINT  1~ 31 
Week  Week  UINT  1~7 
Hour  Hour  UINT  0~23 
Minute  Minute  UINT  0~59 
Second  Second  UINT  0~59 
  Function Explanation 
Sys_ReadTime reads the time of the real-time clock of the controller. When Enable is TRUE, the real-
time clock information in the controller such as year, month, day, week, hour, minute and second will be 
read in the specified variables.