Dear Sir,

Negative Value is not showing on trend graph,
Kindly guide on how to resolve this issue.

This is likely an issue with your default scale or the scale range you have set in your trend. Can you provide more context or some info about what you have tried regarding scaling or display ranges?

Dear Dave,
How to set display ranges in VT Scada ?

Please check out the following link and let me know if you have additional questions: https://www.vtscada.com/help/Content/OP_HDV/Op_HDVScales.htm?tocpath=Use%20VTScada%7CLog%252C%20Note%252C%20and%20Report%7CHistorical%20Data%20Viewer%20(HDV)%7C_____3