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Live Positioning Shown on HMI


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hi thefunkybuddha,

i don't know what sernsor are you using...I am supposing that in someway (on demand) you are able to get info from these sensors...then couple these info with some global tags (or struct...maybe) and couple these tags/struct with the relative HMI elements (text, number...)...all is done...but seems too simple...what sensors are you using?

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Laser sensors. To be more specific, a large overhead crane. The lasers are mounted on the bridge and trolley and aimed at stationary structures ( a wall).  So essentially what I have is a cartesian coordinate system with continuous data that gives me position (x, y).  I currently report the position with a live reading of the lasers on my "run" screen. What I want to do is have the operator move the crane to the origin, record that value (it may be offset from (0, 0)) then move it to the opposite point and record that position. Have that data scaled to the size of the screen, then in real time graphically report that position on an HMI screen. For sake of simplicity mathematically assume  my coordinate system  is (0,0) meters to (800, 480) meters.  Lets say that I represent my life position with a red circle. At (400, 240) my red circle would be at the mid point of my HMI screen. I want that to move as I move position in real time.  Without any further research the only way I can think of to do this would be to overlay a red circle and every possible point with a visibility rule of when  (x,y) = live (x,y). It seems like a brute force method. I was hoping for a much more elegant solution. 

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I believe you can use the INSERT SHAPE instruction, found at the bottom of the Ladder toolbox, under Drawing.

I have never used this, and can't find any help or examples, but when I hover my mouse over the input tag, B, it prompts me to enter the "shape struct". This leads me to believe that you must first define a shape and then create a struct that would include X,Y coordinates. Once you have that struct created, you should be able to manipulate the coordinates based on your laser sensor readings.

If anybody knows where to find an example or instructions for creating shape groups and structs, I would be very interested to see that.



I just tried inserting that instruction and when I create a new tag for each input/output of the instruction, there is a brief description of its purpose/use.

 There are 3 types of shapes available...line, circle & rectangle.  The shape struct is automatically created when you according to the shape type selected when you create the tag.

the circle struct, for example, has Thickness, Color, X position, Y position, and radius.

Well, I tried a few attempts, but I think I need some more info on shape group ID#'s, and color settings. I managed to get the instruction to execute without an error code, but nothing shows up on the screen.



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  • MVP 2023

I do not test layers in Unilogic.

Maybe another idea of brute force - List of Images with vertical line (colour with visible thickness) in different position in one layer (0-100% of x coordinate) and

List of Images with horisontal  line (another colour with visible thickness) in different position in another  layer (0-100% of y coordinate).

Yo can do math with real position and convert it to different variant of working range on screen -one combination of two  image represent position.

User can see on display two crossed line x and y  (maybe :) ).

P.S. Maybe foto of terytory can be placed in bottom layer from SD card.

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I played around a bit with the drawing tools and came up with a reasonable solution. Have a look at the attached program.(I used a USP-070-B10, with Unistream version 1.30.58)

I originally had the circle position updating every scan, but the screen refresh rate could not keep up, so I changed it to update only when the X or Y position values changed.

I linked two sliders to the X & Y position tags in the circle struct that was  created when I defined the shape tag for the insert shape instruction.

It's a bit rough around the edges, but should give you an idea of how the drawing tools function.



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