ION9000 real-time frequency measurement

[igor_iskakov]

Hi Can you help me with customer request.

I suggest possible solution ION9000

• We are only interested in the frequency measurement.
• We would like to be able to send the real-time frequency measurement to a webservice once every second.
• We would like to, for a short time to be able to send the frequencies every 0.1 seconds.

[Charles_Murison · Accepted solution]

Hello @igor_iskakov ,

While this may sound like a simple request, because of how things happen in the back end of the meter this is not as simple as you may think. Inside the meter, registers are either 1 second updates or 1/2 cycle updates. For frequency, there is no way to change the register update rate, you would have to read from different modules. T read from different modules means you will need different modbus addresses.

You could create a new modbus slave module, link the HS (High Speed) Power meter module to input, then setup module as desired with formatting,  scaling, address etc.. Then you could read frequency with 1 second update with the default mapping. If you needed frequency for high speed you would poll the new register created.

Some caveats to consider:
A) Communications are a low priority task, if meter gets busy, you may not get the response times you desire
B) The frequency reading you are getting is a 1 cycle reading during a 1/2 cycle update, this is not the same as 0.1s aggregate of frequency.

regards,

Charles