FB_EcExtSyncCalcTimeDiff64

The function block FB_EcExtSyncCalcTimeDiff64 calculates the difference between external and internal time, taking into account the time offsets.

Inputs/outputs

VAR_IN_OUT
   DcToTcTimeOffset  : ULINT;
   DcToExtTimeOffset : ULINT;
   ExtTime           : T_DCTIME64;
   IntTime           : T_DCTIME64;
END_VAR

Name	Type	Description
DcToTcTimeOffset	ULINT	Time offset between the TwinCAT "Distributed Clock" system time and the TwinCAT system time
DcToExtTimeOffset	ULINT	Time offset between the TwinCAT "Distributed Clock" system time and an external time
ExtTime	T_DCTIME64	External time in TwinCAT "Distributed Clock" system time format
IntTime	T_DCTIME64	Internal time in TwinCAT "Distributed Clock" system time format

Outputs

VAR_OUTPUT
   nTimeDiff             : UDINT; (*with difference greater than 32 bit timeDiff = 0xfffffff*)
   nOffsetFromSyncMaster : DINT; (*less than 32 bit int Offset = 0x80000000, greater than 32 bit int Offset = 0x7FFFFFFF*)
END_VAR

Name	Type	Description
nTimeDiff	UDINT	If the difference is less than 32 bits, the time difference is returned. If the difference is greater than 32 bits, 16#FFFFFFFF is returned.
nOffsetFrom SyncMaster	DINT	If the difference is greater than 32 bits and the offset between internal and DC Time is less than 32 bits, then 16#80000000 is returned. If the difference is greater than 32 bits and the offset between internal and DC Time is greater than 32 bits, then 16#7FFFFFFF is returned.

Requirements

Development environment	Target platform	PLC libraries to include
TwinCAT v3.1.0	PC or CX (x86, x64, ARM)	Tc2_EtherCAT