CTR 500 problem.

We used fielpoint CTR 500 in a project and we noticed the following strange abnormality in their operation : everything is normal for several days. Suddenly, CTR 500 stops counting. The leds are blinking but in fieldpoint explorer (version 3.02), though everything looks normal the channels shows zero and I do not receive any alarm message. Restarting the PC nothing changes. Restarting fieldpoints by stopping and starting again power supply channels start counting again. Is there any explanation for this specific problem?

Hi,
The first thing you should check whenever this behavior comes up is the signal you are inputing in the FP-CTR module. This module has a threshold in the range of 6 to 10 V, that means the threshold of a particular module might be 10 V, so in order to garantee proper behavior your input signal should be at least at the level of 10 V.
Monitor the signal in the input, because the LEDs have a slightly lower threshold then the input itself, so your signal might be activating the LED and not activating the input. The fact that you have to power cycle the module might somehow make your signal level to come back to the expected level.
So the key point in this case is to monitor the input signal is in the necessary range.
Best Regards
Andre Oliveira
Applications Engineer
National Instruments

Similar Messages

Pulse Counting Problem CTR-500

I am using a couple CTR-500 on a compact fieldpoint setup to measure pulses from 2 energy (BTU) meters, 3 diaphragm gas meters, 2 liquid flow meters and 2 Watt-hour electrical meters. I seem to have a problem with my pulse counts accelerating upon start up of the program (up to 1000 pulses/15 minutes <- which is unrealistic for the hardware installed and then falling to 5-10 pulses/15minutes <-reasonable value). The pulse count does not correlate with the manual meter readings I have taken either, with the exception of the Watthour meters. I am unsure if it is my program, wiring, or peripheral equipment at this point.
Has anyone seen a problem like this before? I have included a couple graphs showing the raw pulse count (saved every 15 minutes) and the change in pulse count every 15 minutes.
Solved!
Go to Solution.
Attachments:
Pulse Counting Run Away.pdf ‏128 KB

Here is an example vi of how I am reading the pulses and some data processing I am doing with the signal. I have built in a totalised pulse counter to compensate for the maximum of 65535 pulses that can be counted by the module - so I do not miss pulse counts on reset.
Attachments:
Example code for counting.pdf ‏60 KB

Problem resetting count on read with fp ctr-500 counter

Using the ctr-500 module with a FP-1000. I want to reset the count of a channel on each read. The CTR-500 manual says to selecting "Reset on Read" from the Value menu. I've done that but the counter never resets when I read it. I then tried clicking on "Creat item" under channel attributes in MAX. It creates an item called "Read Reset Mode @Count Input 0" under Data Neighborhood. Added that item to the program and wrote to it with both a 1 and 0, but when I read channel 0 it still will not reset. Obviously, I'm missing something. I would appreciate any help or a simple example so I can get this resolved. Thanks, Mike
Message Edited by mike72903 on 01-31-2008 10:51 AM
Attachments:
reset count1.vi ‏15 KB

Found an example. Thanks anyway

CTR-500 module reading too many pulses?

Hi. I am using a CTR-500 module as a totalizer to count the pulses coming from a turbine flow meter. The flow meter is calibrated for 1 pulse/L and our pump is displacing 5-10 L/min. The pulse's high state is about 18VDC.
The problem we are having is that when the pulse occurs, the pulse count goes up by 5-40 counts (sometimes more). The LED on the module behaves properly and matches the pulse output from the flow meter but the reading we get in NI-MAX is not right. I'm sure this is something simple that I am missing but I can't seem to get it to work right.
I have the feeling that the module is reading many false highs as the pulse is high for a good second or so. How to I get the module to count only the rising edge of the pulse and ignore the rest?
Any help is appreciated.
Thanks,
Dave

Hi Dave,
CTR-500 does use edge counting. You can perform a software check to see if it is still at a high and if it is then not do a count and if it is not the increase the count. The green ready light just indicated that the module is working in normal mode and the green status indicator light turns on when the channel is used. Have you tried using a different flow meter with this?
Warm regards,
Karunya R
National Instruments
Applications Engineer

FP-CTR-500 don't read external count inputs

I have 4 frequency signal inputs (0-10 KHz) connected to ports 2,3,4,5 of one FP-CTR-500, but I can't read any change on counting values, using FieldPoint Explorer. The module is OK, all the LEDs are green, including those four inputs, the firmware version of FP-1600 is 4.11 and software version of FieldPoint Explorer is 3.0.0 I can view a fix value of 53xx counts on each input, after a power up sequence (the external frequency is 8.2 KHz aprox.). What can I do?

There are several reasons that you may be having problems with the count. First, if the channel LED is always on, then the signal wired into the FP-CTR-500 may not be going low enough (below 6 volts) for the module to see the falling and rising edges. Second, if the inputs have been configured with the 200 Hz low pass filter setting, you may be filtering out your signal. Third, if you have configured the count channels for internal count inputs (1 kHz Reference or 32 kHz Reference) or previous count channel, then the module is not looking at your actual wired signals. Fourth, If you have enabled the Gate Inputs (channels 8-11) for any of the counters, then the count will not increment while the gate is low. Fifth, if the channel is configured for Reset On Read fu
nctionality, every time the FP-1600 polls the FP-CTR-500, the channel will reset itself.
Regards,
Aaron

Why does Lookout receive wrong count from FP-CTR-500

Counter module flashes light count = to field pulse input device. Lookout fieldpoint object follows device count, but occassionally double counts giving wrong results. Is this a hardware problem with the counter module? A second counter in the system works as expected. Both are wired the same way and read the same way in the software and are receiving signals from like field devices.

Mike,
To rule out the possibility of this being a hardware problem in the FP-CTR-500 module, you can swap both of your FP-CTR-500 modules. I suspect that the problem will remain on the same signal/channel indicating that it is most likely a signal problem.
You may be receiving a double count as a result of noise or signal differences in the sensors wired to the various channels. To reduce the likelihood of a spurious signal causing a double count, you can enable the low pass filter on the FP-CTR-500 to reject signals above 200 Hz. If you look at the signal on a scope, you may see that it is fairly noisy and could use some filtering. Also, consider if one sensor has a longer cable run then the other or if it routes near something that may be electricall
y noisy.
Regards,
Aaron

How can we substitute the invalid option "reset after read" in FP-CTR-500 + FP-1600 frequency measurement application?

We nned to incorpore the values of 2 frequency signals (0-10 Khz)into a process controlled by a VisualBasic application running on 1 PC with W'95. Because the FP-CTR-500 working with FP-1600 hasn't the option "reset after read", the process of reading is a bit complicate, and sometimes, we receive wrong values of frequency from those devices. Could you help me? Is there any extremely reliable method of reading? Best regards,
Puho

For frequency measurement information on the FP-CTR-500/502 modules. Please see KnowledgeBase Article #1TB63SUS
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/d8db42f9fdc3607e862568640047f144?OpenDocument
Ultimately, the FP-CTR-500/502 modules are not designed for frequency measurement, although it is possible to use them to measure frequency. The one thing is that it works best to do the measurements over relatively long integration periods (1/4 second or more).
Regards,
Aaron

How can I measure RPM with CTR-500 module?

I have used the CTR-500 module for mesurement of motor RPM. But it doesn't have direct option to measure RPM ,
so i have count pulses for 1sec (then reset the counter) and by calculation show the result for 1min. But it varies every time ,cant give me fix RPM.
I want reliable solution for this.

min
You have not said how much the RPM actually varies from reading to reading and what the range of measured RPM is for the process. This variation can be caused by a couple of things. One would be actual variations in RPM due to changes in motor loading. What is this motor driving? Most RPM readouts use some form of sample averaging to smooth out the readings.
A second cause could be your vi. Suggest you post a copy of your vi.
In case you have not seen it, here is a link to a KB about measuring frequency with cFP. It also links to several other docs on the same subject . http://digital.ni.com/public.nsf/allkb/D8DB42F9FDC3607E862568640047F144?OpenDocument

FP-CTR-500 outputs are failed?..

We are working with a tandem FP-1600/FP-CTR-500, and we have set the 4 outputs of the counter module in toggle mode, using 2 counter channel to generate square-waves. All 4 output LEDs are blinking OK, but there are no change in the voltages of physical outputs (position 13, 14, 15 y 16 of terminal block). 24 VDC/ground of power supply is connected to pin V and C, and each different output has a fixed voltage level of 0.65 to 0.85 Volts aprox., even after power-up or general reset. By this way, there are no loads connected to those outputs. Can anybody help me?.

I really do not recommend the self-repair option.
I must point out that opening the module and making any changes to the circuit board voids all warranties on the device. Additionally, whereas I have a fairly good idea of what components need to be replaced, there is no guarentee that what we believe are the damaged components are actually the components at fault. Furthermore, for the components that I would suggest as the likeliest possible cause, your electronic maintenance department may or may not have industrial rated components available to replace the components and would not be set up to fully test the module after it is repaired. The test fixtures at National Instruments for the FP-CTR-500 are set up to test the cou
nt inputs, internal clocks, frequency rejection filters, outputs, gates, input bandwidth and output bandwith.
However, if you feel that your department is up to it, and are willing to void the warranty, then I can tell you which of the components (by the way, these are surface mount IC's) are the likeliest to have been damaged.
Regards,
Aaron

FP-CTR-500 and Frequency Measurement: How to modify it to report the frequency (0-10 Hz) every one minute?

How to modify "Frequency Measurement" to report the frequency every one minute?
The signal frequencies vary from 0 to 10 Hz (see the analog output plot and attached sample data file), so I want record the average frequency every one minute.
Software: Labview 8.5
Hardware: FP-CTR-500
Program: "Frequency Measurement" --build in and under "NI example finder", It was attached with this message.
Physical wiring: (1) The signal I want to measure to count input 1 (pins 2 and 18). it is a pulse signal (range from 0 to 1 V, see the plot and attached data file).
(2) Wire Output 0 (pin 130 to gate 0 (pin 9). Do com pins 26 and 30 need to wire together?
FP-CTR-5000 was set up in Max based on the program instructions. I have tried different gating pulse frequency, my readings are always "0".
Attachments:
H2O_20130809.xlsx ‏18 KB
Frequency Measurement.vi ‏35 KB

CTR-500 high pulse is >=10V. Hence, it always read your pulse as low. With this low voltage pulse, you must use analog input module, and write a program to read pulse from analog level. You must also make sure that you pulse is not so narrow that cFP loop is not fast enough to capture voltage change.

Frequency in cFP CTR 500

Hi, I got a VI to read frequency from cFP 2020 with the CTR-500 module (Frequency Measurement.vi) in NI Example Finder. When I run this VI in LabVIEW for Windows, it's all right. But I want to run it embedded selecting the target and, when I do it, I cannot read the frequency. Does anybody knows what could be happening? Thanks

Hi letreca,
I took a look at your code and it doesn't look like
anything is really wrong there. There was one thing that I think might
help you. Because you do not have any sort of data dependencies, you
could be causing a condition where you are resetting the counter before you
read it. The best way to change this would be to connect the error out of
the Read.vi with the error in of the Write.vi.
You mentioned in your first post that you were using
Frequency Measurement.vi from the example finder (Browse > Hardware Input
and Output > FieldPoint > Advanced); however, the code for frequencia.vi
looks completely different. If you run the example do you get the same
behavior?
I think you may be having an issue mentioned in the first
paragraph because you may be resetting the counters too early. Try the
example and if that works, use the same technique. If that doesn't work,
then try to modify your existing code as described. If neither works tell
me what has changed and what hasn't so I can try to take a closer look into
everything.
Regards,
Otis
Training and Certification
Product Support Engineer
National Instruments

CTR-500 field-device power

Hello forum,
I have recently started my FP adventure, and am pretty impressed with what I have achieved so far ... Still, since I completely lack knowledge of electronics, I hesitate for the following. I have an FP-CTR-500 that is neatly counting pulses from anemometers, water-consumption counters etc. All these devices are powered through the 24VDC power that I piggy-backed from the FP1600. Now, the new counter I'd like to install takes 3VDC in the pulse-generating loop, and I wonder whether I can have this connected to the same CTR, and in what way. Can I use a separate external power supply ?! Any suggestions ?! Thanks a lot for your help,
Amicalement,
Jan Bayer

According to the
device specifications the CTR500 input range is 10 to 30 VDC, so your
understanding is correct on that point. Hence 2 solutions : either you manage
to use signal conditioning to increase your input voltage, or you have to use
another device.
Regards,
Matthieu B.
NI France
Cordialement / Regards, Matthieu B. @ NI France.

Error 500 problem

Hi All,
I am trying to start a .jsp example from the Netscape browser and ran into
an Error 500 problem. Can you give me some pointer of what to look at to
resolve it?
OS: Redhat Linux 6.2
Weblogic version: 5.1
Weblogic directory: /usr/local/weblogic
JDK version: JavaSoft JDK 1.2.2
JDK directory: /usr/local/jdk1.2.2
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weblogic.httpd.register.*jsp=\
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weblogic.httpd.initArgs.*.jsp=\
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compileCommand=/usr/local/jdk1.2.2/bin/javac,\
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weblogic.httpd.documentRoot=/usr/local/weblogic/myserver/public_html/
I put the all the .jsp and .html files from the Weblogic jsp example
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I start the weblogic console and use the console to start the "myserver"
Weblogic server. All these work fine.
Then, I start Netscape browser and enter the URL
http://localhost:7001/jsp/HelloWorld.jsp. The following error was reported:
Error 500 -- Internal Server Error
From RFC2068 Hypertext Transfer Protocol--HTTP/1.1:
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The server encountered an unexpected condition which prevented it from
fulfilling the request.
I double checked and HelloWorld.jsp and HelloWorld.html is in
/usr/local/weblogic/myserver/public_html/jsp/. Please help. Thanks.
Best regards,
Simon

You should check out the WebLogic.log and also the exceptions thrown into
the WebLogic console to see what was wrong.
Thanks,
Michael
Michael Girdley
BEA Systems Inc
"Simon Lee" <[email protected]> wrote in message
news:39b5d092$[email protected]..
Hi All,
I am trying to start a .jsp example from the Netscape browser and ran into
an Error 500 problem. Can you give me some pointer of what to look at to
resolve it?
OS: Redhat Linux 6.2
Weblogic version: 5.1
Weblogic directory: /usr/local/weblogic
JDK version: JavaSoft JDK 1.2.2
JDK directory: /usr/local/jdk1.2.2
Here's some of the weblogic.properties setting:
weblogic.httpd.register.*jsp=\
weblogic.servlet.JSPServlet
weblogic.httpd.initArgs.*.jsp=\
pageCheckSeconds=1,\
compileCommand=/usr/local/jdk1.2.2/bin/javac,\
workingDir=/weblogic/myserver/serverclasses,\
verbose=true
weblogic.httpd.documentRoot=/usr/local/weblogic/myserver/public_html/
I put the all the .jsp and .html files from the Weblogic jsp example
directory into /usr/local/weblogic/myserver/public_html/jsp/
I start the weblogic console and use the console to start the "myserver"
Weblogic server. All these work fine.
Then, I start Netscape browser and enter the URL
http://localhost:7001/jsp/HelloWorld.jsp. The following error was
reported:
>
Error 500 -- Internal Server Error
From RFC2068 Hypertext Transfer Protocol--HTTP/1.1:
10.5.1.500 Internal Server Error
The server encountered an unexpected condition which prevented it from
fulfilling the request.
I double checked and HelloWorld.jsp and HelloWorld.html is in
/usr/local/weblogic/myserver/public_html/jsp/. Please help. Thanks.
Best regards,
Simon

Voltage loss on incoming signal to CTR-500

I have an optical sensor with at 12Vdc power supply hooked up to a CTR-500 module with the cFP-2020. I am trying to set it up to pick up the RPM of a motor. The speed range of the sensor is 1-250000RPM which is more than enough since the max I will see is 4000RPM. With the Power supply either routed through the Module or not through the module, I can see a 10V pulse on a scope comming from the sensor(when sensor line is not connected to module) But once the signal is connected to the channel I want to read it with, the signal Pulse Voltage drops to about 8.5Vdc, which is under the requirement to generate a count.
Can anyone tell me why I am getting a voltage drop? How can i fix it.

rameymm,
The 10 V you read from the sensor with a scope, what is the ground referenced to? When you are measuring the voltage at the inputs of the module, COM is tied to the ground of the 12 V power supply. It is possible that you have a common mode voltage.
Is there anyway you can increase the high voltage the sensor outputs? 10 V is pretty close to the 10 V minimum required between Vin and COM to register an ON state.
Ames
Applications Engineering
National Instruments

We are reading 4 external counting signal and 1 internal 32 Khz clock simultaneously, via a FP-CTR-500 and a VisualBasic app

lication with OPC server. Can we assure that the time of reading of values for all the channels is the same?. We need to compare those 4 external counting values between them, using the 32 Khz internal clock like a time base reference. Can anybody help us?The timing of reading from the VisualBasic application is 2 seconds, and external pulses are incoming at 8 Khz aprox.

lication with OPC server. Can we assure that the time of reading of values for all the channels is the same?. We need to compare those 4 external counting values between them, using the 32 Khz internal clock like a time base reference. Can anybody help us?Eduardo,
The FP-1600 should be sending data is relatively synchronized to the OPC Server. However, since items containing multiple analog/count channels are not allowed in the OPC Server, the OPC Server is treating the channels as separate channels and may not be transmitting the data simultaneously.
The more complete picture looks like this: The FP-1600 reads all 6 channels of the FP-CTR-500, it compares each value to the configured deadband and places any values that have changed in the transmit queue, it then does the same thing for any other I/O modules on the system. Following the scan of the entire bank, it transmits all of the changed data to the client computer. It then starts scanning the bank and the process repeats. The OPC Serv
er on the client computer breaks the data down by channels into the appropriate memory locations. An OPC Client will establish separate requests for each channel. Thus a client may sequentially request data from separate channels and may get data from different times if the OPC Client has updated channels between responding to one data request and then the next.
Regards,
Aaron

CTR 500 problem.

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