The DDL specification does not include the data types SINT, BYTE and WORD. Nevertheless, they are implemented on server side, but the PLC library has only recently been adapted to support them as well.
You need to update NxIpDdl (the base library of the DDL event addon appearing as "DDL" in the version management dialog) to at least V1.2.5. This version requires at least OES 4.10 and the latest versions of DdlEventAddon V2.3 or V2.4.
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