Adding Software Logging to a Modbus Device Type

The Modbus device types you create with the Device Type Editor are limited to reading numeric and Boolean data from the device. These device types cannot access complex data such as historical logs, event logs, or waveform captures. However, it is possible to automatically log the measured values in Power Monitoring Expert after they are read from the device. In addition to logging the measured values, Power Monitoring Expert can also calculate and log average, low, and high values for these measurements.

NOTE: The data logs are timestamped with the date and time at which the software logs the value, not the date and time the measurement was taken on the device. Device communications and system delays determine the time delay between when the measurement is taken by the device and when it is logged by the software.

To add software logging:

  1. In Device Type Editor, open the Modbus device type for which you want to add logging.
  2. Click Tools > Configure Software Logging to open the Configure Logging and Calculation dialog.
  3. In Configure Logging and Calculation, select the measurements you want to log and calculate, and set the logging intervals.

    NOTE: Only numeric output registers can be calculated and logged. All other types of registers (for example, enumerated) do not appear on the Configure Logging and Calculation screen.

    See Configuring Logging and Calculation User Interface for information on the controls and options available in the user interface.

  4. Click OK to save the changes.
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