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Status No Status
Product PI Interfaces
Categories General
Created by Kenneth Barber
Created on Aug 17, 2022

Separate commonly used PI Interfaces that do not have a successor into read-only and write-only versions

Currently, it is recommended to use the read-only version of a PI Interface if only reading is required, and to have separate read and write instances of the read-write version of a PI Interface if writing is required. (Reference: https://docs.osisoft.com/bundle/pi-interface-for-opc-hda/page/_sk_read-only-and-read-write-interfaces.html, and I assume that the recommendation applies to other PI Interfaces as well)

This approach is unnecessarily complicated and can still be made more secure. Instead of having read-only and read-write versions of a PI Interface, consider having read-only and write-only versions of a PI Interface. That way, the recommendation becomes impossible to violate and is therefore no longer needed, and it avoids the migration from the read-write version to the read-only version if writing is no longer required. Since PI Interfaces are slowly being replaced with PI Connectors and PI Adapters, the implementation of write-only versions makes sense only for commonly used PI Interfaces with no direct successor such as OPC DA, OPC HDA, and SNMP.

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  • Kenneth Barber
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    Aug 17, 2022
    The part of the PI Interface For OPC HDA user guide that I reference is: https://docs.osisoft.com/bundle/pi-interface-for-opc-hda/page/_sk_read-only-and-read-write-interfaces.html Also, RDBMS can be removed from my examples, since it now has an equivalent PI Adapter.