Historical trends were not showing values when using with internal tags with Vijeo Citect .
You will not be able to get the historical trends of the local variables as these local variables were having some limitations. Local variables are useful when you need each process to have a separate copy of the data. Each process has its own copy of each local variable configured in the project, and the values in a local variable are available only to the process that wrote them. So you need to create a Disk IO Device from Express Communication Wizard and create variable tags linked to that Disk IO Device. Then you can configure trends of the internal variables using those tags from the disk devices.