The Interoperability Standard
for Industrial Automation
| Welcome | OPC Foundation Online | Certification | Technology | News | https://gitHub.com/OPCFoundation |
Unified Architecture Technology Sample Applications
The Interoperability Standard
for Industrial Automation
| Welcome | OPC Foundation Online | Certification | Technology | News | https://gitHub.com/OPCFoundation |
Unified Architecture Technology Sample Applications
Data Access is the original OPC specification, adapted into the core of OPC UA and defined in UA Specifications Part 8 - Data Access.
Intended for continuous data acquisition from a PLC/controller, and providing the following capabilities:
|
Capability |
Description |
|
Discovery |
The ability to locate other OPC UA products available on a PC/network. |
|
Browsing |
The ability to browse the address space of a Server to obtain a list of usable Nodes. |
|
Read |
To read 1...n Nodes in a single call and obtain the value, quality, timestamp, and a success/failure code for each element - all within a single call. |
|
Write |
To write to 1...n Nodes in a single call while obtaining the success/failure code for each individual element. |
|
Subscription |
The ability to request a Server to monitor Nodes and to send a notification to the Client when the value changes. |
There are many other features of OPC UA that are inherited by the Data Access profile.
There are 2 demonstration applications available: