I currently have Data Logger Viewer, with a chart that displays, for example a value of 0.541221, I would like to know if I could round and display it as 0.54. Would I need to change something in the Data Logger Viewer or something in the I/O Data Server > Data Loggers.
The data logger viewer shows the data as it exists in the DB.
I think that in your case, you are referring to float data type, and the decimal number is managed at the OS level.
I usually “format” the value when reading it from the controller so that the data is already normalized as required. The data is then recorded in the DB and displayed in the viewers correctly.