Application Tips: Control Solutions

Data logging support comes in two forms: Local stand alone, and central server based.

Control Solutions' AddMe III and AddMe Jr. i.CanDoIt servers include internal data logging capability as well as LogMyData support.

Control Solutions' i.Board2 is the lowest cost i.CanDoIt server that supports LogMyData data logging.

Data may be logged to files in the internal memory based file system. These files may be retrieved via FTP, or delivered to you as an attachment to an email. The setup below illustrates sending a daily log file with an email, and also says that after 2 days, the old files should be discarded (to make way for new data).

Once a file is set up, you need to tell the system what data points to log. Any register in the system may be selected for logging, and multiple points may be logged to a single file. They are recorded in CSV format for easy import into spread sheet software. Up to three different log files may be active at the same time allowing different log rates for different points. Simply click the check box in the file column for the registers that are to be logged in that file. The Report box refers to reporting this point by HTTP Get to a remote server set up to receive data logging via Get requests.

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Data trending provides two main functions: (1) Track minimum, maximum, and average, and (2) graph the trend over some recent period.

The min-max-average trending is meaningful when trending is being logged either to a data file or via HTTP Get to a remote server. At the end of each tracking period, the data is logged, and then trend values are reset. If no logging is being done, the min-max-average values will have little meaning since they are essentially "average forever" values. However, the graph is still useful without logging because it is always a sliding window of actual data samples.

Trending is set up under the System->Action Rules->Trending tab. You simply select which data point you with to track and identify it by register number. Then allocate destination registers for the trend results. You can use the auto-allocate button for this.