vanquangtk

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Posts posted by vanquangtk

  2. Posted

    20 minutes ago, pturmel said:

    What does the HMI have to do with this?  Comms between PLCs would typically be in the ladder logic of one or both, with various messaging techniques directly between them.

    HMI observes some signal of PLC which it controls. Then I will use D-Script function to inform for another HMI (if they can communicate via ethernet)

  3. Posted · Edited by vanquangtk

    12 minutes ago, IO_Rack said:

    That is not an Omron product and I haven't used one of those in quite some time. Assuming you want to connect to an Omron PLC (C series, CP/CJ) then you'll need to see if the HMI supports Omron FINS protocol for an Ethernet connection. Connecting multiple HMIs shouldn't be problem as long as each device has a unique IP address. FINS node will be the last octet in the IP address. No PLC setup should be necessary. You'll just need to know the IP / FINS node.

    Note, you may see a Host Link protocol available. This is for RS232C/RS422 connections.

    I'm sorry for post it in Omron. I can connect PLC with HMI via ethernet. But I alos want to  connect those HMI via ethernet (not master -slave relation) so that I can transfer value from PLC to PLC. I search in GP Pro manual, but there are only 2 method: connect one PLC to multiple HMI or connect one HMI to multiple PLC

  10. Posted

    Hello all.

    I have a problem with RPM measurement for a spindle. I hope someone can help me.

    My company's machine uses a disk with two pinholes to measure the speed.In the current program, it uses the following instruction to measure the speed:  SPD X0 K3000 D1

    The issue is that we only receive 2 pulses per revolution, which requires using a longer sampling time for accurate results. Unfortunately, this leads to a delay in the response time.

    I am considering trying a different method for measurement. Would using a PID controller be a good idea?

     

  11. Posted

    22 hours ago, panic mode said:

    number of pulses tells how far to move... rate at which pulses are sent controls the speed.

    PTO.thumb.jpg.130d2ca886f9c5ac32fa6b8f9c

     

    so maximum frequency of the PTO is one of limiting factors. small PLCs often have PTO that only get to few kHz, some may go to 100kHzor 200kH, dedicated modules for larger PLCs are definitely more capable (MHz). by parametrizing drive one can accomplish certain scaling so that for example axis can reach higher speed even when driven by slow PTO. but don't be fooled - this is a tradeoff... you may gain at one end (speed) but you loose at another (resolution). so one need to read the manual, do the math and set parameters correctly to get needed performance. but once you reach point where PTO cannot handle it, it is time to upgrade to more capable PLC.

    I still don't understand the role of the "number of pulses" parameter in position control mode. Why is it necessary when the distance varies depending on the position deviation?

    In Mr Configurator 2 software, the value of the "number of pulses" parameter is fixed and determined by the value of the electronic gear.

  13. Posted · Edited by vanquangtk

    10 hours ago, glavanov said:

    Number of command input pulses is how many pulses are needed for the servo motor shaft to make one revolution.

    So, number of command input pulses does not affect to speed, does it? Do you know what affect to speed of servo in position control mode. I read the manual, but it doesn't  mention about it.

  17. Posted

    2 hours ago, AndreasW said:

    hi vanquangtk,

    I think that the positioning jumps to the next point is ok, because this is the basic function of the continous path positioning mode.
    If you want to stop the positioning after reaching a point this should be done in the positioning complete mode.

    So what do you wan't to do with the the m-code signal?

    If you want to pause the positioning until the m-code is cleaered you should use positionig complete mode instead of continous path.
    If you wan't to detect that each position is reached you can try to immediately reset the m-code with an m-code-off request command
    (mabye within an event-interrupt) to detect the m-code of each point, but this will only work if the positioning time between the single
    points is long enough.
     

    Thanks @AndreasW, I can't use  positioning complete mode because I need the speed keep constant (not return 0 after singgle point positioning completes). Because in Q173D, the speed doesn't return 0  single point positioning completes if I turn on and off the FIN signal soon enough so I want to keep this feature in QD77MS. 

     

  18. Posted · Edited by vanquangtk

    Hello everyone,

    I'm changing a PLC program from using Q173D into QD77MS.

    In Q173D, I have a SFC program which uses M codes in 3 point positions. It means after positioning one point, the M code output signal need to be changed from OFF-ON -OFF to jump to the next positon,

    I want to keep this feature in QD77MS with continous path positioning mode. But I don't  know how to do it.

    With continous path positioning mode, if I keep M code output signal on, after  positioning one point complete, it will still jump to next point positioning.

    May any one help me,please

  19. Posted

    1 hour ago, nehpets said:

    assuming you mean a timer intergrated circuit a simple well documented unit would be a 555 timer ic, for use with a minimal number of discrete components

    I can't set a timer in 555 IC without adding a new circuit. I want an IC which already has a timer.

  20. Posted

    Hello all

    I am sorry for posting this question in the forum, because I don't know where is suitable for posting it.

    I need an IC that is small, and can set timer in it. I means after setting a timer in it from a trigger, when timer on it will output in pin.

    Do you know which IC  have that ability.

    Thanks so much.

  22. Posted

    2 hours ago, Joe E. said:

    We don't use SE anywhere, but we have a lot of PV+ HMIs, so we use ME. My response is based on using FT View Studio for ME. I can't guarantee that your steps will be the same.

    There's a "Global Connections" item in the "System" folder of the project tree. Go to the "Display" tab and there are entries for "Remote Display Number" and "Replace Display Number". Click the "Help" button in that dialog box for information on them.

    Also note that you will have to right-click on the background of each display and select "Display Settings" Each display will need a unique display number for this to work the way you want.

    Thanks @Joe E., I finally found it. It is exactly what you wrote.

    https://www.youtube.com/watch?v=Cf64oco88S8&list=PL7BAkmD1dytiKRUTJTYTGD_uQX7UpbzdW&index=4

  24. Posted · Edited by vanquangtk

    Hello, I would be really thankful if someone could help me .

    Recently, I start using Allen Bradley PLC and HMI.  Before, I used most of .
    I have difficulty in seeking some similar Mitsubishi functions  in Allen Bradley.
    - First, I don't know how to switch HMI screen by using instruction in Allen Bradley PLC.In Mitsubishi PLC, I can do that by move a number to base screen register D0.
    But I can't find the similar register/tag in Allen Bradley.
    zywDLr8R
    - Second, I don't know which bit, relay, timer, counter, register will latch it's value when power turn off. In Mitsubishi, I can know that by looking at FX parameter.
    May anyone give me favour, thanks.
    S08aAv