In this post, I will explain how to get the Local Time from your TwinCAT CPU.Although Some applications are connected with NTP server to sync the Time,lots of applications set the time directly.

Insert the Library

References>Add library.

Search the Tc2_Utilities and OK.

Function Block

FB_LocalSystemTime is a function block for you to get the local time of the local windows system.This Function Block is combined with a couple of Functions.

-RTC_EX2:create a timestamp for log

-NT_GetTime:as to be resynchronized cyclically via the NT_GetTime function block

-FB_GetTimeZoneInformation,NT_SetTimeToRTCTime

FInally we can define the cycle time to get the local time .

And also Summer,Winter,Timezone is an option.

The Output format is TIMESTRUCT.

*Please call the FB_LocalSystemTime cyclically.

VAR_INPUT

sNetID	T_AmsNetID	The ID of TwinCAT Target、Please use empty in the local system.
bEnable	BOOL	Pulse rise = start
dwCycle	DWORD(1..86400)	sync cycle
dwOpt	DWORD	Options,Bit0=True,Windows System Will sync the time with Hardware RTC.
tTimeout	TIME

VAR_OUTPUT

bValid	BOOL	1=the current output of time is valid or not.
systemTime	TIMESTRUCT	Local Windows System Time
tzID	E_TimeZoneID	Summer/Winter

PROGRAM

Here is the sample code and The Function block of LocalSystemTime is called and get the local time in a fixed cycle,

VAR

VAR

bTimeSyncError :BOOL;
bReset :BOOL;
bTimeIsSynced :BOOL;

TimeStruct :TIMESTRUCT;
InitTimeStruct :TIMESTRUCT;

LocalSystemTime :FB_LocalSystemTime;

dwCycle:INT:=1;

TON:TON;

END_VAR

VAR CONSTANT

VAR CONSTANT
ciTimeValidCheckOffset:INT:=1;
END_VAR

Code

IF NOT bTimeIsSynced THEN
TimeStruct:=InitTimeStruct;
END_IF

LocalSystemTime(
bEnable:=TRUE
,dwCycle:=1
);

TON(
IN:=NOT LocalSystemTime.bValid
,PT:=INT_TO_TIME(
(dwCycle+ciTimeValidCheckOffset)*1000
)
);

IF LocalSystemTime.bValid THEN
bTimeIsSynced:=TRUE;
TimeStruct:=LocalSystemTime.systemTime;
END_IF

IF TON.Q THEN
bTimeSyncError:=TRUE;
END_IF

IF bReset THEN
bTimeSyncError:=FALSE;
END_IF