3-7
3-3 Accessing Process Data
Data on MICREX-SX system that can be accessed by SX_MDLW is only the “global variables” defined by D300win.
Therefore, when accessing process data, the global variable information must be given to SX_MDLW. (For the setting
procedure, see “(2) Setting SX” in Section 4-1-1.)
When accessing process data, the OPC client specifies and connects an OPC server, specifies the name (item ID) for
recognizing an individual item from a collection of items accessible from the connected OPC server, and then reads or
writes the related process data.
3-3-1 Item ID and access path
This is UNICODE character string of any size for recognizing an item. It is specified as follows:
directory-name.project-name.configuration-name.resource-name.worksheet-name.global-variable-name
The directory name is the path name of the directory where the D300win project is saved.
The project name, configuration name, resource name and worksheet name are the names created by D300win. Of these,
the variable name in the global variable definition becomes the global variable name.
Accessible item IDs can be acquired using the browse function. In addition, no access paths are used.
3-3-2 Basics of process data access
(1) Process data configuration
Process data consists of three types of data shown below.
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Data types an OPC client can specify when registering an item ID are listed below.
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