Dragging on the trend scale (left side of trend) or trend time (bottom of trend) allows the user to interactively change the trend scale or move forward/backward in time to view historical trend data.
The -100 to +100 scales at the bottom and to the right of the trend are for scale/time compression/expansion. This is an analysis tool to "zero" in on specific data on the trend. It's a zoom in/out for the trend scale and time scale. In the historical plot, these scales are real time so the data will move as you adjust the zoom level.
The only limit to the number of channels is the size of the window to view the data and computer memory. Technically if EnVision was connected to 128 Orion-M systems, each with their maximum of 60 data points a total of 7,680 channels could be in the System Data Log file. |