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CAN Layer 2 OPC Server

-Standardized Interface for SCADA Programs

Overview

By using specific hardware interfaces in PC applications (e.g. visualization or control programs), the problem arose so far that the relevant drivers had to be adapted or created again. The open interface standard OPC represents a data communication interface and considerably simplifies this integration step. OPC stands for "OLE for Process Control" and is based on the Microsoft Windows OLE/ COM technology. Meanwhile many applications, including all common visualization programs (SCADA programs), support the OPC interface.

The OPC server from IXXAT is based on VCI and therefore connects all IXXAT PC/CAN interface cards to SCADA programs. As the OPC server works directly on CAN layer 2, it is not restricted to a certain higher CAN protocol (such as CANopen or Device-Net) but can be used in principle with every standardized or user-specific CAN protocol of the automation and automotive sectors. The data are transmitted between the OPC server and the OPC client ont the level of single layer 2 CAN messages.

Description of Functions

The data interface of the OPC server is described via a project database, in which the interpretation instructions for the CAN messages are entered with the aid of an editor (also supplied). The same project database is also used in the canAnalyser to interpret and display data.

The OPC server can also be extended by further filters for data import, with which a project database can be generated for a system from existing system descriptions. An import filter for CANopen DCF files is supplied as standard, from which the required additional elements for transmission and reception of CANopen PDOs can be automatically generated. The OPC name space is formed automatically by reading a project database.

The IXXAT CAN layer 2 OPC server fulfils the OPC specification Data Access Version 2.0, although OPC clients are also supported according to specification V1.0 or V1.0a. The delivery specification also includes a simple OPC client, which displays received CAN data and thus enables simple tests of the OPC server after installation and first steps with OPC technology.

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