Is the wiring of FP-AI-110 and FP-AO-200 right?

[Bo]

Thanks a lot for your answer. I still have several questions related to use FP-AI-110 and FP-AO-200 to control Mass flow controler. Yes, MFC is Brooks MFC 5850i. Mass flow controller has a 15-pin D connector. Both the input and output are 4-20 mA. Firstly I connected only one MFC to channel 0 of FP-AI-110 and FP-AO-200.
(1)Iin and COM of FP-AI-110 was connected to two current output pins of MFC.
(2)Iout and COM of FP-AO-200 was connected to two current setpoint pins of MFC.
(3)Vsus and COM terminals of FP-AO-200 of which V and C terminal connected to external power supply of 24 V was connected to 2 pins of MFC D connector that needs 15-28 Vdc power supply according to MFC specification.
Now the problem is the readin
g of FP-AI-110 is 0 although the N2 gas was passing through the MFC. Furthermore, there is one error of code 33180 with FP-AO-200(The amount of data provided does not match the number of data items required or the number of channels to be addressed:FP Write.VI). Even though I regulate the output of FP-AO-200(setpoint for MFC), the gas flow rate of MFC didn't change.

[Aaron_G]

Hi Bo,

A couple of things. First of all, when replying to answers it is best to comment on the persons answer. This keeps the additional information in the same thread, and will also generate an email to the person who posted the answer, since they will be subscribed to the original question, but they may miss the additional information if it is in a second question.

Also, currently the FP-AO-200 will not be varying it's current output on any channel from 0 mA. The reason is due to an error in your code. Specifically, you are seeing error 33180 "Amount of Data...", because you are attempting to write to a multi-channel item (I would guess the "All" tag), but are providing the wrong amount of information. On a FP-AO-200, if you write to the "All" tag, yo
u must provide a 1D array of floats with 8 elements to the FP Write.vi, since you are addressing 8 channels. Alternately, if you created your own multi-channel item in FieldPoint Explorer, you must provide the exact same amount of data to the FP Write.vi as there are numbers of channels in the item.

Regards,
Aaron

[Ben]

HI Bo,

Go with what Aaron said. I am working on a similar system as I write. FP and Brooks are working well together for me.

Don't give up. Keep asking.

Ben