I am learning How to interface our RTLS system with Honeywell's Security and Access Control System. Came to know that Honeywell uses OPC standards and to access use OPC DA, Data Access Specification.
What is OPC?
OPC is open connectivity in industrial automation and the enterprise systems that support industry. Interoperability is assured through the creation and maintenance of open standards specifications.
What is OPC DA?
To communicate with real-time devices like PLC or HMI, data access standard made which is named as OPC DA (OPC Data Access). By which real-time data will be communicated between data acquisition devices and computers.
The OPC Data Access specification is also known as OPC DA. OPC DA deals only with real-time data and not historical data.
There are three attributes associated with OPC DA.
1) a value
2) the quality of the value
3) a timestamp.
The OPC DA specification states that these three attributes have to be returned to an OPC client making a request. Therefore, if the data source is not capable of providing a timestamp, for example, the OPC DA server must create a timestamp.
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