Watlow EZwarePlus Programming - Manual (Page 174)

166 EZwarePlus Programming Manual
Chapter 11 – Data Sampling, Trend Displays, and History Data
Displays
Creating Data Sampling Objects and Trend Displays
Data Sampling objects can be used to log historical data. Once data is historically logged, it can be saved to the HMI's
internal memory, or to an external memory source such as USB, an SD card, or backed up to a PC.
The Trend Display Object is used to display the sampled data in single or consecutive PLC registers and plot this data
on a time graph. You can display a maximum of 64 channels with varying pen colors to distinguish the channels. Data
can be displayed in Real-time mode or in History mode, which provide the option of displaying previous days’ data.
Finally, a hold feature allows you to ‘freeze’ the graph, and a Watch line allows you to display the data at a particular
point in time.
In order to create a Trend Display object, you must first create one or more Data Sampling objects from which to
display the trends.
 To create a data sampling object:
1. From the Objects menu, select Data Sampling. The Data Sampling Object Dialog appears.
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