Obvius A89DC-08 - Manual (Page 9)

Monitoring usage:
The A89DC-08 has several data points that may be read using the Modbus protocol.
For each input channel 1 through 8, the A89DC-08 reports a value for the instantaneous and long average current. The
instantaneous value is computed using multiple samples of the input channel, averaged together. The instantaneous value
will represent an average sampling period not longer than 10 ms. The long average value is computed by averaging the
instantaneous values together over several minutes (or hours) of time. The long average should be cleared by writing a zero
to Modbus register 41017. The long average can accumulate more than 30 days worth of average value, however it is not
stored when the power is removed from the A89DC-08.
The A89DC-08 also computes several system wide values including a total and average value for all channels. For each of
these, both an instantaneous and long average value is reported. Total instantaneous current is the sum of the instantaneous
values for all 8 channels. If any channels are disabled, the current value for the channel is not included in the totals.
When using the A89DC-08 with the AcquiSuite data acquisition server, the following configuration page will be presented.
The AcquiSuite will display will report all the data values present on the A89DC-08. In addition, the long average value will
be cleared after each logging interval. Also provided in the AcquiSuite display is the power supply voltage, and onboard
pcb temperature. Lastly, the alarm channel will report which channel (if any) are in alarm state based on the failure criteria
set up in the advanced configuration page.
Page 9 A89DC-08 – DC Current Monitor