Communications in cases where GSGW basic functions and the OPC server are on the same PC are summarized below: Subsystem data acquired via an OPC DA server are stored in the buffer. Data stored in the data buffer are assigned to the communication input/output data storage area. These assigned data can be accessed from the function blocks or sequence tables in the same process as in a normal FCS.
6. Engineering Functions
The CENTUM CS 3000 engineering functions are used for system generation – for creating the databases necessary for monitoring, operation and control – and for maintenance.
The engineering functions are described below.
Run on General Purpose PC
• Like the operation and monitoring functions, the engineering functions run on Windows on a general purpose PC. A special, dedicated machine is not required. You can even run the engineering functions on an HIS – together with operation and monitoring functions – and easily switch between operation/monitoring and engineering windows.
Concurrent Engineering
• Using Windows File sharing, several people can share an Engineering database on a network; concurrent engineering is possible. Alternatively, engineering databases created on separate machines can be merged.
“Virtual Test” Functions
• The control functions can be simulated on a PC. Actual FCS hardware is not required, tests can be performed on an Engineering HIS (ENG) (you can switch between monitoring/ operation and engineering windows). So you can perform tests to validate each program segment immediately after you complete it, if you wish.
Reusable Engineering Data
• Necessary fragments of engineering data can be easily reused in another station or another project. So you can reuse special control know-how, reduce engineering, and standardize control.

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