Product : ISaGRAF V3
Date : 5 March 1996
File : Vartrend.How to trace variable trends with precision.htm
Subject : How to trace variable trends with precision?
Keywords: Trends - Variable trends
The curve object included in Spotlight utility included in the
workbench debugger allows the user to trace variables.
But this tool has very poor precision because variable storing is
made through communication.
If the storing of variable trends requires precision, it is needed
to record the variable states on the PLC. This can be acheived using
OEM or server tools. The easiest way to analyse the results is to
transmit them to a PC (using any RS232 protocol driven by the OEM or
server software, or through application function blocks), and to
perform data manipulation and presentation with a standard tool such
as EXCEL spreadsheet. It is also possible to develop specific tools
directly linked with ISaGRAF product.
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