Using field points how the dc voltage measurement is done?

i am new to labVIEW.. Using cFP-AI 100 i am trying to measure a dc voltage [5volts].. all the field point channels are configured on MAX. when the example VI provided runs with the proper i/o point is selected] there is error indicating that the connection is broken or network module is not pwered on.. but i have checked both .. What may be the problem?

Hi ELUE,
Could you please let me know if the status LED (or any other LEDs are blinking) in a particular pattern on your fieldpoint controller? Also, could you please let me know what controller you are using and if you get a particular error code? Thanks!
Best regards,
Steven

Similar Messages

Using field points how the dc voltage measurement is done?

i am new to labVIEW.. Using cFP-AI 100 i am trying to measure a dc voltage [5volts].. all the field point items are configured on MAX. when the example VI provided runs there is error indicating that the connection is broken or network module is not pwered on.. but i have checked both .. What may be the problem?

Hi ELUE,
When you say "all the FP items are configured on MAX," does that mean you can see and connect to the device? Can you take readings in MAX from the FieldPoint module I/O menu under the Data Neighborhood?
If you're able to read from the I/O menu you are probably using the default I/O point in the example. It's usually necessary to choose the I/O point before running the example.
Cheers.
| Michael K | Project Manager | LabVIEW R&D | National Instruments |

Can I measure Vibrating Wire Strain Gauges using Field Point Inputs?

Is wish to connect a Vibrating Wire Strain Gauge using Field Point.
The sensor requires a swept frequency excitation (typically 400 to 1500 Hz) and then generates a frequency output proportional to the strain applied on the vibrating element. The frequency (roughly upto 1kHz) needs to be measured.

What sort of resolution is needed on the frequency sweeping? There are currently four FieldPoint modules that can be used for generating pulsed outputs; the FP-CTR-500, FP-CTR-502, FP-PWM-520 and FP-PG-522. For the remained of this posting, I will use FP-CTR-50X to represent both the FP-CTR-500 and FP-CTR-502 as they are identical in functionality, different in their input/output stages.
The FP-PWM-520 is a Pulse Width Modulation output with 12 bit resolution on duty cycle and 16 bit resolution on the pulse period. The period is adjustable from 1 to 655535 milliseconds, which makes the module slightly less than ideal for frequency sweeping as it's highest frequency is 1 kHz and it's second highest frequency is 500 Hz.
The FP-PG-522 is a Pulse Generator module that can operate in an continuous pulse mode. The On Time, Off Time and resolution (time base) are adjustable. The smallest time base is 100 ms, for a maximum output frequency of 5 kHz. Like the FP-PWM-520, the FP-PG-522 adjusts it's output rates by changing the time rather than the frequncy, making it difficult to smoothly sweep across frequencies.
Finally, the FP-CTR-50X modules may be used. The FP-CTR-50X modules have 8 16 bit counters, 4 Gates and 4 outputs. The module has two internal clocks, 1 kHz ad 32 kHz that can be used to feed the counters. The outputs can be configured to toggle each time an adjustable terminal count is reached, allowing output pulse generation of up to 16 kHz (32 kHz internal clock divided by 2). The FP-CTR-50X modules have the advantage over the above modules in that the counters can be cascaded and set for differing terminal counts allowing multiple pre-scalers which may allow better resolution of generated frequncies.
For measuring the output frequency generated by the gauge, the only current modules that will allow you to directly measure the output are the FP-CTR-50X modules. However, as they were primarily designed for event counting, it takes a little bit of extra programming to allow them to be used to measure frequencies. The effectiveness of frequency measurement on the FP-CTR-50X modules varies on the sampling period, the programming and the network module. There are several KnowledgeBase and Developer Exchange articles talking about how to use a FP-CTR-50X module to measure frequencies, so I will not duplicate the information in this post.
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

I have a FP-1600 and a FP-AO-200 module, 0-20 ma. When I use Field Point Explorer 3.0.1, I can not command any of the channel output current. The current remains in the lowest value 0.0035 A. What is the problem ?

I have a FP-1600 and a FP-AO-200 module, 0-20 ma. When I use Field Point Explorer 3.0.1, I can not command any of the channel output current. The current remains in the lowest value 0.0035 A. What is the problem ? The communications with the module are OK, because it shows when the current are open or closed.

Jorg,
I noticed that you claimed to be using the module in 0-20mA mode, yet the reading you are seeing is 3.5mA. This is the minimum value (with overranging) when the module is set to 4-20mA mode. My guess is that your module is defaulting back to 4-20mA mode, but your IAK file still thinks the module is in 0-20mA mode. You can verify this by using the find devices button in FieldPoint Explorer and then trying to write to the channel.
To fix this problem, you should use the snapshot feature to change the default power-up mode for that channel.
Regards,
Michael Shasteen
Applications Engineering
National Instruments
www.ni.com/ask
1-866-ASK-MY-NI

Tips on transferring LV executable that uses Field Point Serial to another PC

I have been trying to transfer an LabVIEW compiled executable from one PC to another
The executable references 2 field point serial banks.
After hours of frustration I think I have it pinned it down to the fact that (at least for me) It is not possible unless LabVIEW is invoked on the target machine.
Only if I start LV 2010 and configure a field point control on it then LabVIEW can refer to the Bank. After that I can have it refer to the correct IAK file and the executable will work.
However IF I try to transfer from another machine without starting LabVIEW on the target machine it simply will not work for me.
It seems that I have to load a FIeld point control on a block diagram of a new machine then configure it to get dialogs to come up specifying
how to select the proper configuration. I do not see any of this help in MAX
Id much rather have a way of setting up in MAX than having my EXE work right away. Instead my workaround is to
start LabVIEW and configure a field point control to get it set up proiperly.
This means I may have to install yet another version of LabVIEw to get the exe to work again and its getting tiresome.
I use INI files for the serial port settings. Its the field point software that has me going in circles.
If anyone have any experience or tips for transferring an executable that uses fieldpoint serial (FP-1000) from one PC to another PC
without having to invoke LabVIEW to configureit I would be interested in hearing from you. Thanks
PS Target machine has LV2010 MAV ver 4.70f4
Executable compiled in LV 2010
Source Machine has LV 2010 SP1 MAX ver 4.7.6
Executable compiled in LV 2010 SP1
My next move is to upgrade the target to 2010 SP1 and try again but it has already taken me days to transfer this one program
and I still cant figure out how to do it so I might just wait and see if there is any interest in helping me first.
Thanks again!

I have been to these KnowledgeBase links and what is so frustrating about it is that I have have not seen anything that was not already done
automatically when I created the executable on the source machine and transferred the executable to the target machine.
http://digital.ni.com/public.nsf/allkb/734179A2A6779C4286256C4C0069C5F4
http://digital.ni.com/public.nsf/allkb/2DC46E07FAA0A5EF86256F35006E9AE5
http://digital.ni.com/public.nsf/allkb/0E9001A8C84CD89486256DE80073F198
MY FP version is 6.07 on both machines.
The dll is where its supposed to be on the target machine in a Data subfolder under the main application (exe) folder
The IAK file is created in MAX with the designations identical to what is the source machine.
The EXE is now partially working (somehow) but I am trying to find out the exact procedure for next time so I can write it down for future reference..
EVen though the target application now 'sees' the Field point banks the utility I added into the exe to allow user to configure a front panel Field Point control
(should it be required) does not work. Instead when I try to browse configure the control in the executable I now get this error dialog.
This must be the root of all my troubles.
I am now attempting to resolve this by installing LV2010 SP1 and DCD_NOV10 on the target machine so that it matches the source machine.
(If I am going to re-install Fieldpoint I might as well install the whole Device Driver CD)
I hope this solves this issue once and for all.
Your knowledge base insists that if the field point versions are the same on both machines and if the DLL is where it is supposed to be and if the IAK file is loaded and saved
this should work. It did not and still does not fully work. If I can find the exact reason I will report it in this thread.
Attachments:
ni-FP-error.GIF ‏16 KB

How to use multiple counters in the 6602 to measure cycle length, calculate delay and generate triggered pulse.

Hi,
I need to measure the cycle length of a pulse, calculate a delay based on this value, and then generate a triggered pulse with that delay value. The input and output pulses will be continuous. The best case would be to use the cycle length from one pulse in the calculated delay for the next pulse. One of my biggest problems has been getting the calculated delay value into the pulse specs.vi for the triggered output.
This output pulse will be used to trigger an IMAQ video acquisition; therefore, the solution to this problem will be part of a larger video acquisition application. This has posed a problem, in that accessing the counters has interfe
red with the triggered video acquisition.
Any suggestion will be welcome.
Thanks
Dave

Filipe,
The overhead is the problem I'm trying to get around.
Specifically, what I need to do is to generate an output pulse after a trigger pulse, which is a given percentage of the cycle length. The input pulse is from heart rate, so it will have some variance, and the output pulse will be at a stationary point in the cardiac cycle. For example, for an input pulse of 2 Hz (500 ms) the user would likely request the output pulse be delayed by 75%. Therefore, the generated pulse will have a 375ms delay after the trigger.
In the past I have had hardware built to do this, but I am hoping I can accomplish the same thing with multiple counters on the 6602. I have been able to accomplish this with 3 counters (2 to measure period and 1 for output
) but the overhead prevents adequate triggering of the IMAQ video acquisition. I am hoping another method would solve this problem.
Thanks
Dave

How can I use bullet points on the ipad keyboard?

When writing Notes, on my iPhone, there is a key for bullet points on the keyboard. This doesn't seem to exist on the iPad3 keyboard and just wondered if there is any other way to use bullet points on iPad. They are both set to the English UK keyboard.
Thanks.

There are many other keyboard keys that are hidden under the standard virtual keyboard keys. They will vary from keyboard to keyboard based on your language settings but this article will point you in the right direction.
http://www.my-iguru.com/ipad/ipad-hints-tips/ipad-special-characters.php

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

How to take voltage measurements every minute

Hi all,
I am currently new to labview and i am trying to take timed voltage measurements. Here is what i am trying to do;
I am using labview 2010 and I am trying to take temperature and humidity readings in sync with each other. To measure the temperature i am using a cDaq and mudule 9213, for humiduty i am using the voltage from module 9234 and converting it using the ambient temperature and voltage from my humidity sensor.
Now what i want to do is take voltage and temperature measurements say every minute or 30 seconds, but my buffer fills from the voltage readings and gives me an error or the table takes values from what im assuming is the buffer, one by one, instead of grabbing the current data from the module.
My real question here is how do i take current voltage measurements every 30 seconds?
Thank you for any advice.
Solved!
Go to Solution.

Did you stop your VI when changing voltages? It would make since if you did since the chart will retain its memory while the table's Express VI is reset with each run.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
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Is there a way to sign up on iTunes Match using your credit from the iTunes store? I don't carry a C.C.

I dont carry a C.C. and im wondering if there was a way to subscribe to iTunes Match using my credit on the iTunes store. Anyone have any info?

I believe the answer is no, although if you were able to visit an Apple store you might be able to work something out there. You can use credit I think, but the problem is they still need a credit card number on file to process the purchase.

How replace FP Advise.vi using FP read for the example "Frequency Measurement.vi"?

I have a Labview 8.5 system and a hardware FP-CTR-500, and I tried to modify the NI example (Find example ----> Frequency Measurement.vi) to measure the signal frequency.
But the example FP Write.vi and FP Advise.vi have some problems.
Could you please show me how to correct it?
Thanks!
JL
Attachments:
Frequency Measurement.vi ‏47 KB

Hi JeffLi,
Could you please be more specific about the error you're seeing?
Thanks,
Bobby Breyer
Applications Engineer
National Instruments

I am using field point to replacement plc, i need to control stepper motor by using field point, what module should i buy and how to control it?

Can i use FP-PG-522 or FP-PWM-520 to control the stepper motor.

Cheeking,
I think Aaron has answered this query at: http://exchange.ni.com/servlet/ProcessRequest?RHIVEID=101&RPAGEID=135&HOID=506500000008000000E16E0000&UCATEGORY_0=_49_%24_6_&UCATEGORY_S=0
Pravin

Using a thermocouple, how do I get measurements with reference to time?

I have a thermocouple wired to an XY graph but when I run the application the Y-axis takes the data but does not move along the X-axis, with reference to time, while plotting each new data point. This is to say that I have a completely vertical plot of points for different temperatures a time=0 or x=0.

It sounds like you're not correctly updating the array of x values that contain the time. Unless your acquisition time is not constant, then it's usually easier to use a graph or chart for plotting something versus time. It's pretty automatic then instead of having to do some coding. Could you explain in more detail how you're creating the x axis values or maybe attach the program.

When using field point I/O points i get error message

when labview 1st loads and i open my FP vi which uses FP I/O points to specify the channels, they are all greyed out and the error "unable to bind to comm port" is returned. on running the program a second time, no errors are returned. also i cannot get an executable of the program to run without producing that error.
Any ideas?

Hi Stewbert,
The "Unable to bind to COM port" error indicates that FieldPoint Explorer cannot use the specified COM port for communication. The two general cases that cause this error are that either the COM port is not configured properly or does not exist, or that the COM port is already in use by another program. To check the COM port and eliminate this error, follow the steps below.
First, quit all other applications that may use the COM port. Note that the serial cradles for the popular Palm or Handspring Personal Digital Assistants (PDAs) can connect over a serial port, and therefore you may need to quit the "Hot-Sync Manager" program if your computer is configured to use a Palm.
If closing all other programs that use the COM port does not elimin
ate the error, then next check that the COM port is configured properly. From the Windows task bar, Select "Start >> Settings >> Control Panel >> System >> Device Manager >> Ports". Confirm that the COM port you have specified is in the list, and that Windows indicates that "the device is working properly". Additionally, if the COM port has been added through additional hardware, then use any available diagnostic utility that may have come with the board to test the COM ports. For example, if the COM port is added through a NI-Serial board (PCI-232, etc), then selecting "Start >> Programs >> National Instruments >> NI-Serial >> Diagnostic" will run a diagnostic of those COM ports. Correct any problems that are found, and then continue with configuration in FieldPoint Explorer.
Please let me know if that helps
Thanks
Sacha Emery
National Instruments (UK)
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Using field points how the dc voltage measurement is done?

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