Help on field point subvi

Question

Hi to all, sorry for not making things clear.
I'm designing a project about field point temperature control. This is my first time doing on field point so please help me as much as possible. thank you..I found an example of field point temperature control and some of the subvi are missing, i.e. FP open, read, write, and so on. also, this project is a turn on/off fan with a relay. however, i'm using three fans and it should turn on/off at different time depending on the set of temperature,,, for example, fan1 will turn on at 25 degree C and turn off at 30 degree C,,then Fan 2 will turn on at 35 and off at 40,,, and fan 3 will do the same at 45 and off at 50 degree C,,
Can one Thermo couple do the job or should i have all Three thermo couple.
thank you in advance

Answer 1

Hello nw,
I will try to address all of your questions in an organized manner.
1.  To change the [c]FP-TC-120 readings from millivolts to degrees you
will need to use Measurement and Automation Explorer (MAX). 
            A.  Find your
FieldPoint controller under Remote Systems in MAX. 
            B.  Right-click
on your controller and choose to Find Devices. 
            C.  Then, a
dialog box will appear so you can name your FieldPoint controller. 
            D.  You can use
the default name or re-name the controller yourself.  Click ok when you
have named your controller.
            E.  This will display
all of the devices you have connected to your controller.
            F.  Click on the
[c]FP-TC-120 module and select the Channel Configuration Tab.
            G.  A Range option
will appear so you can change the measured range of the module to
degrees.  You can also define the thermocouple type on the Channel
Configuration            
          Tab.
2.  If you want to turn on and off your heater and fan based on the
temperature, the example you found has the basic structure.  It will read
the temperature in via the FieldPoint Read.  You can replace the pid.vi
with a case structure to write different values to your relay module via the
FieldPoint Write VI.
3.  I am assuming that you are using a [c]FP-TC-120.  If this is
correct, you will be unable to measure the temperature via a thermistor. 
The [c]FP-TC-120 is a thermocouple input module and only able to measure
voltages and temperatures via thermocouples.
If you need further assistance, please provide a comprehensive list of the
hardware you are using. 
Also, I would recommend looking through the FieldPoint Help
which can be found at C:\Program Files\National
Instruments\FieldPoint\documentation\Online Help\fplv.chm.  If you are new
to LabVIEW, taking a look at this KnowledgeBase
Article that contains many LabVIEW learning resources.
Message Edited by Ching P. on 09-05-2007 10:39 PM
Regards,
Ching P.
DAQ and Academic Hardware R&D
National Instruments
Attachments:
Temp_Range_new.jpg ‏96 KB