FB_EcExtSyncIsSynchronized

This function block FB_EcExtSyncIsSynchronized checks whether the internal and external clocks are synchronized (bSynchronized). For this purpose, the system checks whether the difference between the clocks over 10 cycles is within the specified synchronization window nSyncWindow. In the event of invalid data (bNotConnected = TRUE), the synchronization is reported as failed.

The function block is not absolutely necessary for readjustment, but it can be used for information purposes.

Inputs

VAR_INPUT
    nSyncWindow    : UDINT;
    bNotConnected  : BOOL;
    nDcToTcOffset  : LINT;
    nDcToExtOffset : LINT;
    nExtTime       : T_DCTIME64;
    nIntTime       : T_DCTIME64;
END_VAR

Name	Type	Description
nSyncWindow	UDINT	Time window [ns] within which the internal and external time are regarded as synchronized.
bNotConnected	BOOL	TRUE, if the data is invalid (corresponds to the WcState of the EL6692)
nDcToTcOffset	LINT	Offset between the distributed clock time and the TwinCAT time [ns] from the InfoData of the EtherCAT master
nDcToExtOffset	LINT	Offset between the distributed clock time and the external time [ns] from the InfoData of the EtherCAT master
nExtTime	T_DCTIME64	External timestamp
nIntTime	T_DCTIME64	Internal timestamp

Outputs

VAR_OUTPUT
    bSychronized : BOOL;
    nDcOffset    : T_DCTIME64;
END_VAR

Name	Type	Description
bSynchronized	BOOL	TRUE if the difference between the internal and external time over at least 10 cycles is within the synchronization window.
nDcOffset	T_DCTIME64	Magnitude of the current difference between the internal and external time [ns]

Requirements

Development environment	Target platform	PLC library to be integrated (category group)
TwinCAT v3.1.0	PC or CX (x86, x64, Arm^®)	Tc3_EtherCATExtSync