XPath – XML Query Language.
The Extensible Markup Language (XML) is an important standard for communicating structured data across the internet. For this reason, XML is also used both for value or parameter entry and output in IT-connected and internet-ready production systems around the world. The XML Path Language – in short XPATH – allows easy XML data access for the OPC Router. The XPath plug-in allows easy extraction of desired information, which is then passed on to other customer-specified destinations in other connected systems.
Achieve More with Combined Systems
XML can transmit and exchange data as document between systems. In detail, this means that complex and interrelated or connected data like, for instance, production orders are transferred as one data document between systems. The data document is an XML packet parser that caters for fast and efficient information transfer, which can be tuned to be a perfect fit for a company’s production environment.
Industry 4.0 via XML and XPath
Networked production and manufacturing heavily relies on data transmission between systems. XML is a powerful format for describing complex data and for making Industry 4.0 a reality in your industry segment, which is highly automated and organized along a value chain of production as well as a value chain of supply management.
About the OPC Router
The OPC Router offers a visual network configuration interface for successful cross-linking of your systems. A high variety of plug-ins turns the OPC Router into a powerful data hub for industrial applications.
Easy configuration, sophisticated monitoring and robustness are main distinguishing features of the OPC Router.
That’s how easy it is.
The transfer object of the XPath plug-in allows access to incoming XML documents.
The query expects an XML document as entry data field. The XPath query is created and formulated in the transfer object by extracting defined data portions – and also data structures – from the source document. Then, the data output is made available to the subsequent objects as data field.
The XPath Plug-in does not have its own trigger functions but uses the trigger functions available in the OPC Router.
The XPath Plug-in does not use browsing.
How do Transfer Objects, Triggers and Browsing work?
The OPC Router establishes connections between systems that address core functions of the OPC Router.
Functions of the respective plug-ins may vary, due to the different nature of each connected system.
Sources and Destinations
Transfer objects are the sources and destinations inside the OPC Router. They contain data fields with read and write functions. Depending on the respective interconnected system, the possible configuration scope of sources and destinations may vary.
Homegeinity on the Outside – Heterogeinity on the Inside
Inside the OPC Router configuration, the transfer object abstracts the respective system of any connected system into a simple data input and data output block. Thus, the functions can be treated in the same way although each connected system has very individual features.
Triggers determine execution time of data connections. Various triggers can be used for these connections, independent of transfer object type. Within each connection, several triggers can be used together via AND/OR-connections. Triggers can also be useful as data sources if the prompting event is combined with data reception.
Searching and Finding Data Fields
Easy browsing also makes data field configuration easy when establishing transfer objects in order to establish the respective interface connection. The browsing mechanisms may vary, depending on the system and its available plug-in.
Reading out Structures
Many plug-ins that are available for the OPC Router offer easy search and selection tools for quick identification of respective data fields without the need for specific knowledge about inherent subsystems. The user can easily browse through the data. Data source structures may vary according to the specification of each respective plug-in.