FAQ Question
Why can’t I view historical data in Object Historian or the embedded graph if I use the IGSS bcl files as source? I have recently upgraded my IGSS configuration from version 2 to version 4 and every time I try to use the two above mentioned functions the result I get is nonsense.Answer
The IGSS bcl files generated while running the version 2 configuration or application need to be converted so that the IGSS ODBC server can make them available for the Object Historian, the embedded graph (and the ERW module) in version 4.
When upgrading from version 2 to version 4, complete this bcl conversion procedure first (see below) and then continue with the remainder of the conversion process as described in the help file called Global Help under the topic “Moving from an Older Version of IGSS?”
Locate the folder where the .BCL files for version 2 are stored.
Open a Command Prompt and find the IGSS utility called bcl2to3.exe, which is normally found in the [IGSS install path]\gss sub-folder.
Run the utility from its location in the gss sub-foler with a path to the location of the .BCL files. Here’s an example: [IGSS install path]\gss bcl2to3.exe C:\Plant10\Plant10.r (NOTE: The converted .BCL files will be placed in the Plant10.r sub-folder.)
Inspect the resulting file names after running the utility. If a conversion has taken place, the utility renames the original .BCL file with a new extension name called. BC2 and converts the original file while retaining the same. BCL extension name. Please note that not all of the original files may have been converted. Only those. BCL files that were affected by a system halt need to be converted by the utility. After conversion, all files within a given. BCL class will have the same size or vary only slightly (one byte).