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Unable to Add Item to OPC Server, but LinkMaster Can Connect and Add a Group


Last Update: 11/12/2018

The OPC DA 2.05A specification stipulates that clients (like LinkMaster) are not required to use an access path. Some servers, however, require that clients provide an access path when adding an item. For example, if users do not specify an access path, LinkMaster's Event Viewer may show that it was unable to add an item because the server returned error 0x80070057 ("The parameter is incorrect").

A space character may be all that the server requires in the access path. When using LinkMaster with these types of servers, double-click the link item to open its Link Item Properties. In the Input tab (or Output tab as necessary), enter an access path to meet the requirements of the server.

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