I would like to add five 4-20mA current loops as outputs as a shield to my Arduino board to output some variable values. I found the "4-20mA T Click" shield which looks very nice but only has one current loop transmitter. So instead of getting 5 boards, I thought of putting together one with 5 current loop transmitters. The schematic for the "4-20mA T Click" is the following :
My idea would be to use only one ADuM1411 Quad-channel digital isolator and just use the same MCP4921 12-bit DAC and XTR116 4-20mA current loop transmitter circuits 5 times with the SPI channels connected between them.
My main doubt is if the ADuM1411 will be able to feed enough current to all 5 loops. Also, are there more things that I should take into consideration?
I am making a prototype of a corrosion measuring device that measures temperature, humidity, relative pressure, and corrosion from 2 sensors a copper and a silver one. And I would like to try it in an industrial environment and PLCs for what I know works with this type of signal.
Arduino and industrial environment are not great bed fellows .
You need to look at the PLC you wish to use and see what the I/O options are, then spec up your system as to what sensors etc - you might end up using transducers which already have a 4-20mA , or a PLC that accepts a serial link for example.
You can also buy industrial voltage to current converters
Ok, I think I get better at how the circuit works... So the XTR116 is "fed" by the current loop itself? And the voltage in the current loop can be any voltage between +7.5V and +36V if I understand correctly the datasheet for the XTR116.
