OPC compatibility

OPC Alarms and Events Custom Interface Standard – 1.10.

The value of [PIHOME] variable for the 32-bit interface will depend on whether the interface is being installed on a 32-bit operating system (C:\Program Files\PIPC) or a 64 bit operating system (C:\Program Files (x86)\PIPC).

The value of [PIHOME64] variable for a 64-bit interface will be C:\Program Files\PIPC on the 64-bit Operating system.

In this documentation [PIHOME] will be used to represent the value for either [PIHOME] or [PIHOME64]. The value of [PIHOME] is the directory which is the common location for PI client applications.

Note: This interface has been built against a UniInt version (4.5.0.59 and later) which now writes all its messages to the local PI Message log. Please see the document UniInt Interface Message Logging for UniInt 4.5.0.x and later Interfaces in the %PIHOME%\Interfaces\UniInt directory for more details on how to access these messages.

We are revising product documentation and other literature to reflect the evolution of the PI Server from a single server to a multi-server architecture. Specifically, the original historian core of the PI Server is now referred to as the PI Data Archive.

Originally, the PI Server was a single server that contained the PI Data Archive and other subsystems. To add features and improve scalability, the PI Server has evolved from a single server to multiple servers. While the PI Data Archive remains a core server of the PI Server product, the product name “PI Server” now refers to much more than the PI Data Archive.