Text you type in Filter dynamically limits what items are listed for selection. If you left off the leading asterisk (Figure 5-7 ), only those logs with descriptions beginning with Hourly would display, as shown in Figure 5-8 Figure 5-8 A leading wildcard (*) is typically used, otherwise few items are typically seen. V IEWING SELECTED L OGS OR A RCHIVES When you view numerical data in a chart, the vertical value scale (y-axis) provides numbered labels according to values in the log (or archive) records. If binary data or multi-state data, the different possible states are also indicated on the y-axis. By default, charted logs also show an abbreviation for associated engineering units, for example, F, “cfm”, or perhaps “no_units” (if a log is not assigned units. Binary and multi-state logs show the different state descriptors, such as On or Off Active or Inactive or Off Slow and “Fast.” When looking at a chart of multiple logs where different units are used, a separate value (y-axis) scale appears for each unit type. As shown in the example in Figure 5-9 , the two logs use different units (F and kW).
Chapter 5 Log Charts Using the Log Selector Niagara Release Niagara Browser Access Guide Revised: August 15, 2002
