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Old January 9th, 2014, 10:46 AM   #1
Ireland is offline
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DC power meter with analog output


i need a DC power meter that gives a 0 - 10V along ouput signal. i need this signal for a plc.

the power level to be measured will be small i.e. pobolaly less than 10 Watts.

so i need a small cheap DC watt meter or some other way of measuring power. unfortuatley i only have one analog input available in my PLC

can anyone tell me where i could buy one?

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Old January 9th, 2014, 10:48 AM   #2
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They have European distributors.
True craftsmanship is only one more power tool away.

That's the beauty of processors, they don't have emotions they just run code - The PLC Kid.
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Old January 9th, 2014, 12:33 PM   #3

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can you refference your plc 0v and load 0v ? if so, you could just put a serial resistor that would give a differential voltage at full load. According to load voltage, maybe not use full span to obtain 10v as it will remove 10v out from the load too...
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Old January 9th, 2014, 01:46 PM   #4

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te voltage is very easy just 2 resistors to make the 24 voltage max 10.
possible with resistor of 10 kiloohm and one of 15 kiloohm.
the current is possible with a current converter (look at arduino for a cheap one.acs758

to have both analog inputs use a relais switching between both inputs (you will need another output for this.
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