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Found 9 results

  1. Continuous sine wave problem

    Hi,  I encountered specific problem during work with PLC&HMI application. The main task of that system is controlling torque changes of induction motor with inverter&analog PLC output. There are few built-in functions to change torque: exponential, constant, trapeze and unlucky sine. All functions are implemented as array of 1500 values. When array reaches 1499 element, it comes back on first position and so on. It works without any problem for exp, constant, trapeze and sine wave with natural numbers of frequency e.g. 1Hz, 3Hz etc. The trouble appears when we want to control torque with float value of frequency and unfortunately its the most important part of that project. When the float value frequency is chosen, the last element of array is totally different than the first one. In result, in every period of array, appears drop of value. Check the attachments to comprehend what's going on. The first image shows GXWorks restriction of index. The second image shows how does it look on simulate screen, where it's representation of PLC registers D2000 - D3499. On third and fourth images you see values of registers in Device Memory Batch of GXWorks. Fifth image shows the script which I work on. Do you have any ideas how to implement float values of frequency in correct way? I should make an opportunity to online change of sine frequency in continuous way between 0 and 10 Hz, with 0.2Hz step. I will be very grateful for any advice.  Greetings, J
  2. Develop a program that will latch on an output Y0, 20 seconds after input X1 has been turned on. The timer will continue to cycle up to 20 seconds, and reset itself, until input X1 has been turned off. After the third time the timer has timed to 20 seconds, the output B will be unlatched.
  3. GT Designer3 Script Problem

    Hi,  I encountered a specific problem during work with GXWorks2 & GTDesigner3. In my part of group project I need to receive from proper script, array of values of sine wave. I need to get 1500 values of sine wave and fill registers in GXWorks and have no idea why my script does not run. I'm using simple while loop with no errors statement from Syntax Check. My script should calculate sine values from index 0 to 1500, and substitute it to registers D2000 - D3499. Look in attachments for better understanding my trouble.  I'm looking forward to hearing from you as soon as possible.  Greetings, Jan P.S. I'm new in Mitsubishi Equipment programming so if it's some kind of beginner's problem - please be merciful for me.
  4. Good day Please assist me - pertaining to the QSeries GXWorks2 Programming  - and in particular the utilization of the macrocode functionality. The information required includes; [1] Purpose of macrocode (incl advantages) [2] its utilization's effects on the PLC programming memory (it appears that it consumes more programming memory. [3] any reference documentation that could be used - containing specifically information regarding this feature (note most manuals doesn't discuss this)
  5. Got2000 and gxworks3

    I need help i have a got 2000. I developer my software for the hmi with gtworks 3 my problem is: when i update my software in the hmi over the USB cable with my Notebook then i become an error message after reboot. the error message is: communication error refer to sytem Alarm in utillity menu. At the moment i must disconect the hmi from the current and then it works. can everbody help me?  
  6. can you help me? bring me some example to build function block program with Gx Works? I use Q02U CPU   thanks
  7. GX Work2 Comments in Arrays

    I am very new to the Mitsubishi PLC world (I have a lot of experience with A/B and Omron though).  I am having an issue trying to assign comments to an array of Globally scoped bits - I am also using Structured Ladder - NOT simple ladder.  Is it possible to do this?  I have contacted there tech support group and they were of little help.  I don't care if I update the label comment or the device comment, I just want to assign a simple comment that can be displayed (i.e. I am using this for step sequences).   Any help would be greatly appreciated!  
  8. Mitsibushi GX Works 2 Error C4105

    Hi, I am building up a project in GX works for the first time and have several program blocks with function blocks set up (all in ladder). My problem is when I go to enter new tasks in the execution program it comes up with the error: More than one ladder program has been set in the program file 'MAIN' Has anyone had this issue? Is this to say that you cannot have more than one program in the execution program? Thanks Neill  
  9. Non-volatile memory GX Works2

    Hi all, Im trying to figure out how to create non-volatile memory tags in GX Works 2 (using a FX3U controller), so that the values stored in the D registers won't keep zeroing out every time the controller powers down. Does anyone have any helpful tips on how this is done? Thanks