by IEC 61131
in the IEC61131-3 standard
Interface for IEC 61131
basically a IEC-61131 [...] aspects: IEC-61131 [...] mapped to IEC-61131
implementation in IEC61131 [...] IEC61850 Server [...] H Title IEC61850 Server
The standard IEC 61131 [...] this syntax to IEC
from the CODESYS / IEC-61131