Opc Interfaces - ABB 800xA User Manual

Section 4 Visualization and Data Access
A list of events pertaining to specific date and time appears in the main window.
Figure 16. Viewing Events by Time and Date

OPC Interfaces

OPC is used to bridge Windows based software applications and process control
hardware, control system. OPC Data Access is a group of standards that provides
specifications for communicating real-time data from data acquisition control
system. The OPC Data Access specification is also known as OPC DA. OPC DA
deals only with real-time data.
OPC Historical Data Access, also known as OPC HDA, is used to exchange
archived process data. It provides COM specifications for communicating data from
devices and applications that provide historical data, such as databases. The
specifications provides for access to raw, interpolated and aggregate data.
OPC Unified Architecture (UA) is a platform independent interface specification for
data communication between History database and OPC Clients or Servers. OPC
UA specification uses TCP/IP or Web Service for data communications.
2PAA107563-600 B
OPC Interfaces
41