TREND 963 Web User Guide - Manual (Page 31)

Using 963 From a Client
963 Web User Guide TC200685 Issue 4 31
4.5 Display Graphs
4.5.1 Display a Compact Graph from a Schematic Page
Compact graphs of data logged in IQ controllers can be displayed. When a compact log is requested the controller
transmits the highest and lowest values in the log and every other value as a percentage of the range. This allows for rapid
transmission of data and for very large numbers, but has an error of 1% of the range of values in the logging channel.
Compact graphs are not available for values logged by periodic and triggered plots, or periodic and triggered plots.
To obtain a graph it is necessary to display a precision graph by right clicking.
Note that for values from BACnet devices a precision graph is always displayed.
To display a compact graph from a schematic page:
1. Display the schematic page containing the value for which logged data is to be graphed as described in the
‘Display a Schematic Page’ section of this manual.
2. Right click the value and click Collect Compact Log Graph from the displayed menu. If the value is
being logged by more than one plotting channel point to Collect Compact Log Graph and click the
required plotting channel.
Or
If the value is a sensor click the value that is to be graphed. If the sensor is being logged by more than one
plotting channel the first plotting channel will be used.
The graph is displayed.
To display a compact graph from a text mode schematic page:
1. Display the schematic page containing the value for which logged data is to be graphed as described in the
‘Display a Schematic Page’ section of this manual.
2. Click on the sensor label to collect the first plot, or click for the required plot.
4.5.2 Display a Compact Graph from the Device Viewer
Compact graphs of data logged in IQ controllers can be displayed. When a compact log is requested the controller
transmits the highest and lowest values in the log and every other value as a percentage of the range. This allows for rapid
transmission of data and for very large numbers, but has an error of 1% of the range of values in the logging channel.
Compact graphs are not available for values logged by periodic and triggered plots, or periodic and triggered plots.
To obtain a graph it is necessary to display a precision graph.
Note that for values from BACnet devices a precision graph is always displayed.
To display a compact graph from the Device Viewer:
1. View the values that are to be graphed in the Device Viewer as described in the ‘Display the IQ System’
section of this manual. Values that can be graphed are indicated by a .
2. Right click the value and click Collect Compact Log Graph from the displayed menu. If the value is
being logged by more than one plotting channel point to Collect Compact Log Graph and click the
required plotting channel. To graph more than one value hold down the CTRL key and click the required
values, and right-click one of the values and click Collect Compact Log Graph. When graphing more
than one value 963 will use the first plotting channel for each value.
Note that this feature is only available accessing the 963 Server in graphic mode, and is not supported for values
from BACnet devices.
4.5.3 Display a Precision Graph from a Schematic Page
Normally logged data from the controller will be sent in a compact format to save communications; however, to achieve
this some accuracy is lost. Precision graphs ensure complete accuracy but take longer to receive. Precision graphs of data
logged in IQ controllers can be displayed. Each graph can contain multiple traces of up to 1000 values.
When a precision log is requested the controller sends every value in the logging channel as an individual 6-digit
number. This allows for great accuracy but a reduced range of values (999 999 to –99 999, or .00001 to -.0001).
More importantly the transfer rate is much slower. For this reason users can limit the number of points retrieved for
a full-precision log collection and should not use this method to collect 1-second logs. This method would always be
the preferred method for meter readings as there is no loss of raw data.
To display a precision graph from the schematic page:
1. Display the schematic page containing the value for which logged data is to be graphed as described in the
‘Display a Schematic Page’ section of this manual. r