Maybe you can get a list of all types via a dataDownloadRequired (OpconXml) or DataSet (Public Interface), but it must be implemented/configured on MES site.
It looks like there is a MES function GetAvailableTypes, see MES DirectDataLink documentation "Module.SetupControlAccess_UserManual_EN.pdf"
I have never seen a project that uses such a function*, but I am looking forward to your feedback 😀
* Bosch AE has realized something similar (download process list at machine startup, then download process data). But I am not sure how it is realized on MES side.
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