Section 3 SX_MDLW Specifications
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3-1 MICREX-SX Communication Middleware Operational Specifications .................... 3-1
3-1-1 Execution environment .......................................................................................................... 3-1
(1) MICREX-SX Communication Middleware execution environment .......................................................... 3-1
(2) OPC client execution environment .......................................................................................................... 3-1
(3) D300win applicable version .................................................................................................................... 3-1
3-1-2 Development language for client ........................................................................................... 3-1
3-1-3 List of communication interfaces ........................................................................................... 3-1
3-2 Interfaces Supported by SX_MDLW .......................................................................... 3-2
(1) OPC server ............................................................................................................................................. 3-2
(2) DA browser ............................................................................................................................................. 3-3
(3) OPC group collection .............................................................................................................................. 3-4
(4) OPC group .............................................................................................................................................. 3-5
(5) DA item collection ................................................................................................................................... 3-6
(6) DA item ................................................................................................................................................... 3-6
3-3 Accessing Process Data ............................................................................................ 3-7
3-3-1 Item ID and access path ....................................................................................................... 3-7
3-3-2 Basics of process data access .............................................................................................. 3-7
(1) Process data configuration ..................................................................................................................... 3-7
(2) OPC server data type ............................................................................................................................. 3-7
(3) List of MICREX-SX data types accessible by OPC server ..................................................................... 3-8
3-3-3 Scheme of process data access ........................................................................................... 3-9
(1) Scheme of data access .......................................................................................................................... 3-9
(2) Cache data and device data ................................................................................................................... 3-9
(3) Synchronous access and asynchronous access .................................................................................. 3-10
(4) Update and data change notification (subscription) .............................................................................. 3-11
(5) Quantitative restriction .......................................................................................................................... 3-11
3-4 OPC Functions Not Supported by SX_MDLW ...................................................................... 3-12
