OPC Client

This chapter explains the most important terms and presents the steps involved in starting a functioning OPC communication. The individual points will be dealt with in more detail in the subsequent chapters.

However, this documentation cannot describe exactly how OPC works, and in particular the use of all parameters. It is necessary to study the relevant server documentation and/or the OPC Data Access specifications, in order to cover this subject area.

OPC

OPC (OLE for Process Control) is the utilization of OLE/COM technology for process-control systems. The specifications needed for this are laid down by the OPC Foundation (http://www.opcfoundation.org). The specification documents cover several areas:

  1. Data Access
  2. Historical Data Access
  3. Alarms and Events
Note: Historical Data Access is not used by this driver.