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PM8000 High Speed Metering

Metering & Power Quality

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Andy_Hubert
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Posted: ‎2016-09-29 07:55 AM

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‎2016-09-29 07:55 AM

PM8000 High Speed Metering

I have a customer here who has some PM8000 meters, they would like to read the HS values from the modbus registers shown below.

In Demo mode these do not seem to update any faster than 1 second.

Has anyone tried this before? and do you get a much faster update of the registers.

Thanks

 

HS Current A210002FLOAT32AR/Onumeric---HS I aCT_AMEMNone
HS Current B210022FLOAT32AR/Onumeric---HS I bCT_AMEMNone
HS Current C210042FLOAT32AR/Onumeric---HS I cCT_AMEMNone
HS Current N210062FLOAT32AR/Onumeric---HS I 4CT_AMEMNone
HS Current G210082FLOAT32AR/Onumeric---HS I 5CT_AMEMNone
HS Current Avg210102FLOAT32AR/Onumeric---HS I avgCT_AMEMNone
HS Frequency210162FLOAT32HzR/Onumeric---HS FreqHZMEMNone
HS Voltage, A-B 210182FLOAT32VR/Onumeric---HS Vll abPT_VMEMNone
HS Voltage, B-C 210202FLOAT32VR/Onumeric---HS Vll bcPT_VMEMNone
HS Voltage, C-A 210222FLOAT32VR/Onumeric---HS Vll caPT_VMEMNone
HS Voltage, L-L Average 210242FLOAT32VR/Onumeric---HS Vll avgPT_VMEMNone
HS Voltage, A-N 210262FLOAT32VR/Onumeric---HS Vln aPT_VMEMNone
HS Voltage, B-N 210282FLOAT32VR/Onumeric---HS Vln bPT_VMEMNone
HS Voltage, C-N 210302FLOAT32VR/Onumeric---HS Vln cPT_VMEMNone

HS Voltage, L-N Average

210342FLOAT32VR/Onumeric---HS Vln avgPT_VMEMNone
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patrickw
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Posted: ‎2016-10-04 11:22 AM

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‎2016-10-04 11:22 AM

Hi Andrew,

You are correct that the HS Power Meter Module only updates once per second in demo mode.  With a non-demo volts mode, the data is refreshed every half-cycle. 

The caveat with reading this over modbus, is that the round-trip comm delay in making a request and getting a response for highspeed data is variable.  Depending on the meter loading it could take up to a second to get a response (metering and logging is always higher priority than comms).  You will need to benchmark it in your specific scenario to see if it will be fast enough for your needs.

See Answer In Context

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sesa105600_brid
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Posted: ‎2016-10-04 07:28 AM

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‎2016-10-04 07:28 AM

Since the are almost in order I guess it would be smart to create a Modbus Register Group that reads all signals at a time

I assumed it was SmartStruxure, but maybe it wasn´t

Christer

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patrickw
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Posted: ‎2016-10-04 11:22 AM

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‎2016-10-04 11:22 AM

Hi Andrew,

You are correct that the HS Power Meter Module only updates once per second in demo mode.  With a non-demo volts mode, the data is refreshed every half-cycle. 

The caveat with reading this over modbus, is that the round-trip comm delay in making a request and getting a response for highspeed data is variable.  Depending on the meter loading it could take up to a second to get a response (metering and logging is always higher priority than comms).  You will need to benchmark it in your specific scenario to see if it will be fast enough for your needs.

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Andy_Hubert
Lieutenant Andy_Hubert Lieutenant
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Posted: ‎2016-10-10 02:15 AM

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‎2016-10-10 02:15 AM

Hi Patrick,

Thanks for the reply, that is exactly as I had hoped.

My customer is redaing the registers from a PLC connected via TCP, so it should be fast enough.

Thanks

Andy

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