Library version

All libraries have a certain version. The version is indicated in the PLC library repository, for example. A global constant contains the information about the library version:

Global_Version

VAR_GLOBAL CONSTANT
    stLibVersion_Tc2_SMS_SMTP : ST_LibVersion;
END_VAR

ST_LibVersion

To see whether the version you have is the one you need, use the function F_CmpLibVersion (defined in the Tc2_System library).

Library version 1:

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All other options for comparing library versions, which you may know from TwinCAT 2, are outdated.