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sunit

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Posts posted by sunit

  2. Input Interrupt routine

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    The idea of using index pulse with high speed input is good but there is another limitation to this that is i want to take action on the rising edge of the index pulse. HSC interrupt will take action on falling edge. Then also i will try on falling edge if it works better i will use it that way.

     

    Input Interrupt are very useful for motion application. E.g i am doing a cut to length application where i have one stepper motor with drive connect to v130-j-tr20.

    I am pulling a plastic film which has a mark on it. i have to stop on the mark. The application works fine on slow speed but as i start increasing the speed the mark starts shifting this is because of the scan time. If if have input interrupt we can stop the motor on the rising edge of the mark. So its necessary to add such hardware features to PLC.  

  3. Input Interrupt routine

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Can any body help me in how to create a input interrupt routine in unitronics plc. Other PLC like AB , Siemens , Omron , Delta, has this type of routine.

    The input subroutine is immediately triggers on the rising edge of the input.

     

    Application.

    I am using a encoder with marker pulse. I am using this marker pulse to reset the encoder counts, but at the same time i need to reset some other MI's of the plc. I am also using the HSC reload option to generate _HSC interrrupt. At every HSC interrupt i am storing the current valve of the encoder to a series of MI. E.g 1st interrupt  MI0 , 2nd Interrupt MI1 and it goes on till it reaches to a certain point.

     

    When i get the marker pulse i want to reset the encoder value and at same time all other value store in the series of MI, MI0, MI1, till may be MI10.

     

    i am using a 36000 ppr encoder so i cannot depend on scan time to reset these MI. I tried it but then i miss the 1st two MI readings. The marker pulse is so small that sometimes its doesn't come in the scan time.

     

    Encoder speed is 5-10 RPM.

     

    If i get the option of input interrupt routine then i will configure the marker pulse as input interrupt and reset all MI when marker triggers.

  7. PTO function

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Hi Sunit,

    The fact that the PTO Read Status function block results always in the same figures (+-12) indicates that this is an application issue. 

    You can look for mathematical or linearization functions which can cause this.

    You are also welcome to post your application here, or send it to support@unitronics.com for further review.

    Dear friend

    I have done no mathematical calculations in the program. In PTO configure block the unit = 1 and pulse per unit is also = 1, so the PTO read status should only show the number of pulses which are been genrated.

  8. PTO function

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    hi

    I am using a V350-35-TR20 plc and using the PTO function.

    In Unit and Pulse per Unit  = 1

    I am using the PTO move with Relative Position control.

    Every thing is working fine and the stepper motor is working as per my logic.

     

    But in the PTO Read status i am not geting the current channel position correct. it is showing  + - 12 pulse extra. sometines it shows 12 pulse extra or sometimes it shows -12 pulse. Can any one suggest some solution for this.

     

  9. Remote connection to 2-3 pc simultaneously

    in Remote Operator

    Posted

    As I explained, you can use up to four different devices over the Ethernet network. You can define different port for each device and communicate as you will...

    Please see the attached application. I sets up four sockets with consecutive ports 20255-20258 for TCP communication. All you need to do is define the IP address, port number and PLC name to open a connection.

    Thank you ,  i will check the same with your program and let you know soon

  10. Remote connection to 2-3 pc simultaneously

    in Remote Operator

    Posted

    Hi

    I am using a V350 - j- TRA22 PLC.  I want to use remote operater with 3 computers. i am using a ethernet port with plc

     

    1. 1st computer is in the control roon from there the operater will see the status of machine and control it.

    2. 2nd is in the quality control roon from there the quality person will just see the status of machine and quality related parameters (no control from there)

    3. 3rd is in the production managers cabine form there he will just see the status of machine and production related parameter ( no control from there)

     

    The 1st computer will be connect to plc 24X7 , but the other 2 will be connected to the plc as per there requirement.

     

    You can also suggest any other good option for this application.

  13. HSC counter

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    I am a regular user of unitronics PLC and i have developed many application with the help of unitronics PLC. While using a HSC counter i always feel there is a limitation and if any one can help me in this it would be thankful

     

    1. Unitronics HSC counter with AB phase counting does not have external reset option. so i find problems while doing a increamental encoder application for 360 degree cam function.

     

    2. The HSC also does not support a external or internal Start/Stop option. So it make difficult to pause the counting for a while if necessary for some applications.

     

    3. The HSC also does not support the up/down counting option.

     

    If any body having any good idea to over come these problems, please suggest me.

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