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lawry

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Posts posted by lawry

  7. V 9.8.64

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Flex,

    Thank you for your reply. Re installing V9.8.64 on my Win7, 32 bit laptop, got rid of the Run-time error.

    Whenever i worked on a project on any prev versions, as a force of habit, I would periodically save my file (overwrite on the same file). Here in V9.8.64, every time that i try to do so, I'm prompted that another program is using the file, and that the file should be renamed. I would then save it as filename_x.vlp. It would then save it. Now i did this and saved my latest file and took a coffee break. On resumption, the latest file opened with the work that was done 2 days back, even though the time stamp of saving was just half hour back. Now i have un installed V9.8.64, installed V9.8.31, but alas i cannot open the file i was working on. Now Ive resigned to rebuilding the project from scratch 

  10. Shielding/Screening

    in We're Listening...

    Posted

    On 8/28/2017 at 11:23 PM, JohnR said:

    Screen/Shield, always been the same thing in my mind, although from a broader perspective, shielding may refer to the braid/foil/drain wire on a cable, while screening may be thought of as something in a bigger sense, like a metal (screen) partition between noisy parts of a panel and noise sensitive parts.....

    I've been doing industrial control for 30 years, and was always lead to believe "one end" grounding to be proper in this field.

    But, before that, I worked in the audio electronics field, and the proper method was to ground both ends of the shield, but you also did your best to maintain a "star ground" topology to eliminate potential ground loops.....

    just my 2cents.....

    Disclaimer.... at least in my part of the world, I realize Aus and others have words and meanings that us funny tawkers don't get........

    JohnR

    In audio electronics, this was necessary, as the shield would usually be connected to the analog ground and would not be necessarily earthed. Whereas in industrial applications, the shield would best be earthed at one (preferably the source) end and have no connection to any Vcc grounds.

  21. Deleting timer bug

    in We're Listening...

    Posted

    Hi,

     

    I am using 9.8.18, build 0. Have observed 2 issues.

     

    1.  Whenever i try to delete a subroutine, i get the message

     

    " Run Time Error 3021,  Either BOF or EOF is True, or the record has been deleted. Requested operation needs a current record "

     

    and i have to shut down Visilogics and then start it again. This time it allows one to delete the subroutine.

     

    2. Again, this pertains to 9.8.18 build 0, storing an encoder value on power off and retrieving it on power on, using MLs doesnt work. Only works with DWs. The MLs get reset to 0

     

    Are these issues only faced by me?

     

    Thanks

     

    Lawry

  23. CANBus and UNICAN

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Hi Ausman,

     

    In the earlier trials (when i was using both Canopen & Unican), the termination resistors were on the V1040 & the V130. These 2 being the ends & the encoder in the middle as far as the daisy chain went.

     

    Now the termination is set on the V130 & the encoder. And YES the termination is set correctly.

     

    Apart from relaying the lift position and various sensor statuses to the V1040, the V130 has only one other function, that of operating a latch via a single solenoid ( the power supply for this output is different)

     

    The communication has been established by means of a trailing cable of fixed length. This cable moves freely along with the lift.

     

    Thanks

     

    Lawry

  24. CANBus and UNICAN

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Thanks Ausman.

     

    1. The V1040 is stationary, the Encoder and the V130 are on the lift. The connection is via a dangled cable and is connected in the same sequence. 120 Ohms resistors are installed at the V1040 & the V130.

    2. If CAN Open is used by itself, then there are no issues ( the distance is not a factor), similarly, using only Unican again has no issues. The problem arises when both are used.

    3. My work around has been to use the Encoder and V130 on CANOpen and communication between V1040 & V130 is being done on RS485 (MODBUS). I am using the very same dangled cable and am having absolutely no issues with this combination.

     

    However since Unitronics has an option of using both CANOpen & Unican, I think, its appropriate that an example of this is included.

     

    Regards

     

    Lawry

  25. CANBus and UNICAN

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    This is an urgent appeal for help.

     

    I have a V1040 which is Stationary, a V130 which is mounted on a lift and a Kubler 8.F5868.212F.2123 Absolute Encoder. The Lift travels a distance of 50 meters in the vertical direction. I have earlier asked for some pointers in the use of both CANOpen and UniCAN, but to no avail. My system works fine for some time & then i either lose comm between the V130 or the Encoder or both.

     

    How do i avoid this. What would the best sequence of switching be?

     

    Please Reply ASAP

     

    Thanks

     

    Lawry

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