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How to connect a 4-20 mA to 0-10 Vdc Analog inputs

Introduction


Do you have a 4-20mA analog signal? You can use the diagram below to know how to connect it to the 0-10Vdc input.


The product families Ardbox Analog and Ethernet PLC have some analog /digital configurable input signals.


To do this it is necessary to connect an impedance of 500 between the analog 4-20mA signal and the ground signal as shown in the diagram. If you do, the analog value will change.


Requirements:


Ethernet or 20 I/Os PLC:     Ethernet PLC          20 I/Os PLC

Industrial Shields Boards:    How to install the IS Boards


How does the input value change to Arduino?

When you have a signal of 4-20mA for 10bits you get the following data:

4-20mA signal

10 bits

4mA

0 value

20mA

1023 value


but, if you convert this signal to 0-10Vdc, the results are:

4-20mA

0-10Vdc10 bits
4mA2Vdc

204 value* (aproximately)

20mA10Vdc

1023 value


(*) As you can see the result of 4mA (2Vdc), it is close to 204. Below is the linear graph where the results come from:



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