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Guest cj

Histograms

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I'm playing with Control Logix's histogram (trend) and I notice that it doesn't get down to scan resolution (or I'm missing something).. Didn't the SLC and PLC 5 series allow for scan resolution histograms? Or am I getting old and my memory is failing me?

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Basic Trending in RSLogix 5000 allows you to view data sampled over a time period in a graphical display for a set of up to eight data elements. Data is sampled at a periodic rate that is configurable from 10 milliseconds to 30 minutes. RSLogix 5000 will allow you to create a trend, configure the data elements and display attributes, and save it as part of your project file. Basic Trending has these constraints: you can trend data elements of type BOOL, SINT, INT, DINT, and REAL, you are limited to sampling eight unique data elements, and you will be limited to activating data collection for one trend at a time. From the trend instructions. Use the "Sample" tab from chart properties to select period.

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