TC_SysLatency 1:

The function block "TC_SysLatency" can be used to determine the current and maximum latency time of a TwinCAT system. The function corresponds to the TwinCAT latency time display in the TwinCAT system menu under real-time settings.


    NETID  : T_AmsNetId;
    START  : BOOL;

NETID: This parameter can be used to specify the AmsNetID of the TwinCAT computer whose latency time is to be determined (type: T_AmsNetID). If it is to be run on the local computer, an empty string can be entered.

START: the block is activated by a positive edge at this input.

TMOUT: States the length of the timeout that may not be exceeded by execution of the ADS command.


    BUSY    : BOOL;
    ERR     : BOOL;
    ERRID   : UDINT;

BUSY: When the function block is activated this output is set. It remains set until a feedback is received.

ERR: If an error should occur during the transfer of the command, then this output is set once the BUSY output was reset.

ERRID: Supplies the ADS error number when the ERR output is set.

ACTUAL: The current latency time of a TwinCAT system in µs.

MAXIMUM: The maximum latency time of a TwinCAT system in µs (maximum latency time since the TwinCAT system was last started).


Development environment

Target platform

PLC libraries to be integrated (category group)

TwinCAT v3.1.0

PC or CX (x86, x64, ARM)

Tc2_Utilities (System)