Timeout when using Modbus vi

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• DAQmx (200284) timeout when used in threaded loop - parallel processes

  Hello

  I use a fast NI6537 for a digital Acquisition. The Board of Directors is installed on a NIPXIe-1062 Fund controlled by a controller OR SMU-8130, where the software is running. I read all the 32 lines as a single channel, 50 MS/s, and the clock is one provided by the Council itself. I set the timeout as infinite, but I also tried various other parameters. As I read a finite samples lot of 524288 samples at 50 MS/s, a timeout of 1 second should be enough by far.

  As much as I put the call DAQmxReadDigitalU32 (...) in a simple loop I have no problems, everything works fine.

  for (...) {

  DAQmxReadDigitalU32 (...);

  } / / This loop works perfectly

  While, if one has a loop within a multithreaded process, or simply I give the system of freedom inside the loop, sometimes, I get the timeout error. Note that the time cost of the Sleep() function is only a few milliseconds, so there is no reason for the call to timeout.

  for (...) {

  DAQmxReadDigitalU32 (...);

  Sleep (1); To free the system resources...

  } / / This loop stops erratically

  With the latest code, I see also that in fact, the jury has not finished playing, i.e. less back than that requested samples. It seems to me that something is preventing the acquisition, but I'm not able to understand that. The same phenomenon occurs even in LabView, using the VI read: sometimes reading randomly generates a timeout error and stops, although LabView is the only application running.

  You could tell me what I'm doing wrong?

  Thanks, Piero.

  Hello Piero,.

  I don't know how you built your code in labVIEW, but I was unable to reproduce this.  The error that you have posted but reflects an overflow memory buffer and we has expired.  How many samples you ask to be returned with your DAQmxReadDigitalU32? In the code that I've built, I simply left the default timeout to 10 seconds and asked that all the samples available in the buffer.  I have read the pieces of the buffer until I hit 524288 samples desired and then I get out my loop.

  This error probably indicates that you ask a number of samples and have not yet acquired in the timeout you set.  Please post if these suggestions do not help.

• Error timeout when using hardware DAQ-6024E frequency measurement

  
  
  

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  I'm currently reading from operating records a PLC with MODBUS/TCP. I confirmed that the PLC will update the values and in response to a MODBUS communication correctly by using a third-party program called Modbus Poll. However, when I try to query the PLC using the LabVIEW shared variable engine, I am unable to read the values of the same addresses that I consult with Modbus Poll.

  My installation is simply to a PC directly connected to the controller via Ethernet without a router between the two. I'm using LabVIEW 2011 SP1 with the DSC module.

  I opened the Manager of distributed systems OR to display the State of all variables in the Modbus Library that I created, and I noticed that the ILO CommFail permanently the value 'true '. All other variables with a 'read' access mode signal "failure of process". I tried to restart the process and stop and start the local variable engine without success. I also restarted my computer several times to see if any services did not exist, but this does not appear to have solved the problem.

  Finally, I resorted to listening to communications on the network card I have the PLC connected via Ethernet using Wireshark and found that while Modbus Poll communicates with PLC, number of MODBUS and TCP packet is sent and received. However, when using only LabVIEW or the DSM OR communicate with the controller, there don't seem to be any communication on the network card.

  Something that may be interesting to note is that I could communicate with the PLC and to read values with the DSM just once, when I understood everything first what address I should be reading of. All of this has stopped working shortly after. Prior to this, 'CommFail' was not generally set to 'true' with my current setup. Thinking it was my firewall, I have since disabled my firewall, but this seems to have had no effect on the problem either.

  Any help on this would be appreciated.

  So, I thought about it. It turns out that the IP address of the server i/o MODBUS must be set to the address of the MODBUS slave, not the local computer. The address of the i/o MODBUS server is defined by the navigation in the Explorer window projects, expanding the variable engine shared library for MODBUS and right click on the server MODBUS (for example Modbus1) item and select Properties.

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  I use a NI USB to RS - 232 to connect with a Watlow EZ-Zone PM controller using Modbus Protocol and will have bad to write a value (set temperature) to the controller.  I got when reading registry values, so I know that my settings are correct.  I also checked this using a program of Test of Modbus Watlow provides.  Using this program, it became clear to me that a carriage return is necessary after the numeric value.  MB series query writing Master only allows a value of U16.  How can I include a carriage return?

  A statement like that makes me think that she's not speaking modbus.

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  Hi jscher2000

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