Graph average temperature from a field point device
Hi,
This is first ever post. I'm an absolute biginner in LV and engineering student in University of Houston.
I'm simply tring to read a cFP-TC-120 device and avarage first 100 values of each of 8 thermocouple values and draw graphs for each channel.
I have attached my vi.
My question is , is there a better way to do this?
Attachments:
Test.vi 58 KB
1_post.JPG 147 KB
Thank you so much Che T.
Please see the attached diagram. How I can do the auto indexing now?
If I wire the array directly to the For loop (auto index) then how can I calculate the avarage for each separate channel.
This is what I need to do.....
I need to avarage each channel (100 samples each) and save them columnwise in a text file. Something like below.
Timestamp
Channel 1
Channel 2
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
CJ
Attachments:
2_post.JPG 39 KB
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Hi, again sorry to keep coming back to you guys, but i have been trying hard to attempt things myself.I have read loads of books and can not find example to work from.I have managed with your "help" to finnish my calculations. Now i need to plot a graph with the data from my X array and Y array. I will then try my self to plot the linear least fit line if it kills me. I would like to print stars on the graph using the points in my arrays. But where do i start
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LinearLeast1.java:111: illegal start of expression
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^
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symbol : class Applet
location: class LinearLeast1
class LinearLeast1 extends Applet
^
3 errors
lindsey
code:
import java.io.*;
class LinearLeast1 extends Applet
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//defines the sum method
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double SumA =0; //sum of array
if (arr.length >=1)
for(int i=0; i< arr.length; i++)
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double SumXY=0; // sum of arrays X*Y
if(arrX.length>=2)
for(int i=0; i< arrX.length;i++)
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double SumA =0; //sum of array
double AverageB =0; // average of array
if (arr.length >=1)
for(int i=0; i< arr.length; i++)
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} // end of classThanks for that, I thought I upset every one, only just stopped crying
here is my ammended code again before I go to bed, hope it's right this time
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class LinearLeast1 extends Applet
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public static double SumA (double arr[])
double SumA =0; //sum of array
if (arr.length >=1)
for(int K=0; K< arr.length; K++)
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} // end of classHope that is better, I will take your advise and not give up. Will try to have another go tomorrow as it is 2.30am now. So I will try and get some sleep. Thanks again for coming back to answer I needed that bit of encouragement. Don't know if that bit of code for drawing my applet is right or not.
good night and thanks again
Lindsey -
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 advanceHello 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 -
We want to know the basics of installation of field point s/w and where to start from after installation.
Then we also need the details of HOW TO WORK in it. what are the other hardware and software that are necessarily to be installed along with field point in the PC. How to connect the hardware fp2000, to the PC.
Actually we tried installing the field point s/w, but we did not get the field point explorer icon to continue working.Hi.
You can find informations in the NI Developer Zone (Distributed I/O -Fieldpoint)
http://zone.ni.com/devzone/devzone.nsf/webcategories/67EFA8729F4A7741862567E1006EDA74
and here for the Basics:http://zone.ni.com/devzone/conceptd.nsf/webmain/2124F6BBD29663D886256CB80054DBD7
Configure your fieldpoint in MAX. -
Hi Everyone,
I have a program that sends information(analog output) to lab windows cvi in the form of a text file or user input.
The program runs on the computers that I have the field point explorer and lab windows cvi installed on. In order to run the program without always installing labwindows/cvi and field point; I wanted to create an executable file that could be load on another computer.
I used the create distribution kit part of labwindows/cvi to do this.After creating the distribution kit, I then installed it
to another computer.
My user interface appears on the screen, when the user clicks on the exe. file, but no data is sent to the field point module. I know that the data is being read from the user and textfile because in it appears in the uir.
The following are some details about the problem:
1. On another computer without labwindows/cvi and field point explorer not installed - no data is sent to field point module
I know this because a current is being read on the current meter connected to field point module.
My questions are the following:
1. What are the possible reasons for the data not being sent to the field point module?
2. Do I still need to create an iak. (Installing Field point Explorer) file stored on any new computer that I install my created distribution kit file too?
Thankyou very much for any help that you can provide. I greatly appreciate it.
Faen9901Re: Hello, I have created a distribution kit for my program.The problem is that the when the program is installed onto another computer, it fails to communicate with field point (Using FP-AO-200 and FP-AO-1000). Help is greatly appreciated, Thanks faen9901Faen9901,
1) If you do not install FieldPoint Explorer, the FieldPoint Server is not installed so there is nothing on the target computer that knows how to talk to the FieldPoint system.
2) Yes, you need an IAK file on the target computer. Assuming the settings (i.e. com port#) are identical you can simply include the iak file as part of the distribution.
3) You also need to include as part of your installer the file "fplwmgr.dll". If this file is not installed, your program will not be able to access the FieldPoint Server. Alternatively, this file is installed automatically if FieldPoint Explorer detects LabWindows/CVI or Measurement Studio Development versions on the target computer or if you choose to do a custom FieldPoint Explorer installation and
choose to provide LabWindows/CVI support.
Regards,
Aaron -
I have problem in transfeering data using field point via tcp
I am reading the values from the filed point, which is connected, to the RT controller and transferring the values to the client PC via TCP at a specified acquisition rate.
Case1 when the acquisition rate is 0.1 minutes I get the values from the controller correctly i.e. 5v, 5v, and the chart shows no change. The timed out of the TCP read is default value i.e. is 250ms
But when I change the acquisition rate to .5 minutes I get the values as 5v, 0v, 5v, and 0v. The time out of the TCP read is same as first case. The inputs to the field point are at the constant 5v.
Please tell how to solve the problem so as to see the plot in the chart continuously as inputs for the field points the read
ing are at constant rate of input 5v.Suresh,
Since this question deals with using the LabVIEW TCP/IP functions, you are better off posting it to the LabVIEW discussion forum.
Regards,
Aaron -
Can FTP-access to field point log file interrupt the running program?
Can FTP-access to field point log file interrupt the running program?
We have a problem where our factory process control program on a Field Pointer suddenly stops the process. We are running the development system on a PC, wich deploys the program on the Field point, with user interface on the PC. Quite often the process stops for no apparent reason. I'm not sure right now if the control program on the Field Point is still running or if it stops. We use FTP from a distant PC (over VPN) directly to the Field Point to check if the process is running, by looking for date and size of log files produced during running process. I've never opened och copied any log file during process run, because this I'm sure this would cause problems for new log entries to be written. But can the mere looking at the log folder via XP-pros ftp-functionality cause the Field Point to have problems writing data to a log file?
I'm not sure how windows XP pro handles "my network places" when it comes to FTP, it look that it keeps some kind of local copy of the folders, or at least the files opened.
Next version of the program will have only basic functionality on the Field Point, leaving logging etc. to another program on the PC, but right now we are stuck with this system.
Ola AIt turned out that the problem lies in the harware of the production machine, it was not a labiew-program problem at all!
Ola -
What are the limitations of using labview 8.5.1 developers suite verses a real-time module in field point applications? Can an exe. be loaded onto a field point controller or does the controlling program have to reside on a PC for example?
centerbolt is correct, you can't load a .exe or even run a program on the fieldPoint controller unless you have the Real Time module. However, that does not mean you can't use your FieldPoint bank without the Real Time module.
From LabVIEW for windows you can make calls to the fieldpoint IO using the fieldpoint read/write functions.
This program runs on the PC not the FieldPoint controller. If you loose network connection to the fieldpoint, your program will loose connection to the IO. For many data logging applications this type of arrangement can work just fine. However, if this is the only type of application you are ever going to run, then you may as well not buy the Real Time controller for your fieldpoint but the network controller only.
If your application requires more reliability, and/or greater determinism than can be achieved by running a program on windows, then you should use the LabVIEW Real Time module and develop a program that can run down on the FieldPoint controller independent of windows.
Message Edited by StevenA on 07-22-2008 04:14 PM
SteveA
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fp pallet.PNG 6 KB -
3D Line Graph.vi not displaying line connecting data points.
I'm having trouble getting 3D Line Graph.vi to display the line connecting my data points. I'm collecting latitude, longitude, and depth data from a binary file, loading this data into arrays with a while loop, and sending those arrays to 3D Line Graph.vi. When I tried doing it with arrays created by random number generators, the line is displayed, but when I use it with my actual data, no lines are displayed. I can only see where the data points are when rotating the 3D graph. Any ideas on this would be appreciated.
Thanks,
Morgan
Attachments:
Plot Depth.PNG 61 KBKarunya,
Thanks for the info on the 3-D Curve VI. I tried it and it works. I think I was able to find the problem with 3D Line Graph.vi. It has something to do with plotting very close points away from the origin and scaling the axes to view the line. I have attached an example of where the vi breaks down. In this example, you can see that part of the line is drawn, but when you rotate the graph, you can see that the line is not drawn through all of the points. If you change the scale of the axes, then you eventually get the line to go through all of the points, but then the graph is not very "readable" at that point. It's when you try to zoom in really close to the plotted points.
Thanks!
Morgan
Attachments:
3d Line Graph Error.vi 16 KB -
Digital Potentiometer control in Labview with Field Point Unit
Hi..
I need some help on programming the LABVIEW to control the digital potentiometer.
It is AD7376 which 4 channels are used to control the digital potentiometer, and Field Point Unit FP-DO-403 thr. RS232.
– Channel 0 (POT_D), Channel 2 (POT_CS), Channel 3 (POT_Clk), and Channel 7 (POT_R).
-SDI (serial data input) contains 7 data bits. The first is the MSB.
-ClK provides the correct time reading the serial data.
-CS (chip select) only allows the reading of the data. CS is on 0 during the loading. POT-CS is used when 7 bits data is finish loading.
- POT_R is used as CLEAR.
After the calculation depending of the different conditions, 7 data bits data is created and changed to the opposite numbers (1-->0, 0-->1).
For example; if the calculated binary number is 1001011, the the output 7 bits data is 0110100
so Those data has to go to SDI (Channel 0 (POT_D)) starting from 0110100 and for each bit CLOCK has turn on and off to shift the bits controlled by Channel 3 (POT_Clk).
For example,
0 ---> POT_D then POT_Clk -->On/Off
1---> POT_D then POT_Clk -->On/Off
0---> POT_D then POT_Clk---> On/Off
Can this be done automaticaly? Could you help me on this?
I was able to program it until producing 7 binary bits (refer to the attached file) but by Giving 7 different bits at once to ONE channel, I get error..
Message Edited by Black Comb on 11-01-2007 08:51 PM
Message Edited by Black Comb on 11-01-2007 08:54 PM
Attachments:
AD7376toBIN44.vi 49 KBBlack,
Here is a concept for how to do it. Did not have time to look at data sheet for IC but this should be a good starting point.
Attachments:
Create inverted 7Bit Array.vi 19 KB -
Analog waveforms in Field Point
Hi all,
I have a Field Point 2000 which reads a load cell. I can display the readings in LabView using a waveform graph, but it seems the results are only coming out as a digital output, i.e., as a square wave. Is there any way of reding this output as a analog waveform. Does anyone know any function or vi that allows me to do so?
Thanks a lot,
AdrianaAdriana,
Assuming that you are using the Polymorphic version of the FieldPoint VIs, it is likely that the wrong version of the VI was selected. You should be able to right click on the FP Read.vi and choose Select Type. Under Select Type, you should choose either the FP Read (Float)or FP Read (Float Array) if you are using FieldPoint Refnums. If you are using the FieldPoint IO Point tag, you should choose either FP Read (Float -IO) or FP Read (Float Array -IO). For either of the above, you should select Float if you are reading a single channel and Float Array if you are reading multiple channels on the module.
Regards,
Aaron -
Can I collect the pulse data using Field Point?
I have a water flow meter, which outputs pulses. I use a counter to connect it and read the data. Now, I want to read and save the data in the computer using LabView and Field Point. I think this can be done if I can collect the number of pulse. I am wondering how to do that.
Thanks.Dear Zl,
Counting pulses is much easier with the FP-QUAD-510 or FP-CTR-500, but can be done with the FP-AI-110. You can't directly count the pulses with a FP-AI-110, but you can do it in software. Bring in the data by doing a normal read. Then, using shift registers, if the previous voltage is less than .8V (low) and the current voltage is more than 2.5 (high), increase the pulse count. I have attached a program that shows what to do with the data once you bring it in. I took the data from an array outside the while loop, but your data will be brought in one point at a time inside the while loop. One thing to take note of, since Fieldpoint brings in data at 1 kS/s, this will only work with pulses slower than 500 Hz. The farther the duty cycle is away from 50% duty cycle, the slower the signal must be in order to catch the pulses correctly. Please let me know if you have any questions. Have a great day!
Sincerely,
Marni
PS- Please only post question once.
Attachments:
pulsecount.vi 22 KB
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