https://forge.codesys.com/forge/talk/Engineering/thread/6a053bb432/2022-04-13T02:01:37.182000ZRecent posts to Tracking PieceID2022-04-13T02:01:37.182000Z2022-04-13T02:01:37.182000Zdr3amwithyouhttps://forge.codesys.com/u/dr3amwithyou/https://forge.codesys.comfcd0bceee6627a8dcdc6902491617b624874d55f

<div class="markdown_content"><p>Hello,<br/> I'm new to codesys and i'm currently leading with a problem which i couldn't find an efficient resolution yet. Basically all i wanted is to track a piece throughout the production line, and passing the Identifier of each piece between FBs (using SFC), in the runtime.<br/> So, whenever a new piece comes in i was assigning ID to it, and then pass that ID to the next function_block whenever the piece reaches it. <br/> For example between two conveyors:<br/> when a conveyor is sending a piece to the next conveyor, at the same time, i call an action that copies the piece_ID to the input of the next conveyor. Then that same conveyor has to store that ID.<br/> Furthermore, I thought in creating a global variable as array, where each position was a slot for each conveyor, and when a conveyor has a piece(detected by a sensor), i put the piece_ID in that corresponding slot. Thus, i only had to check the array to check where the piece was.</p> <p>Example between 2 conveyors:<br/> <img alt="" rel="nofollow" src="https://imgur.com/ktU7a58"/><br/> <img alt="" rel="nofollow" src="https://imgur.com/2HLC6yy"/></p> <p>when conveyor is sending piece i call a this action:</p> <div class="codehilite"><pre><span></span><span class="err">gvl.piece_ID:=pieceID_O;</span> </pre></div> <p>simultaneously the next conveyor stores that ID with this action:</p> <div class="codehilite"><pre><span></span><span class="c">pieceID_I:=pieceID_O;</span> </pre></div> <p>and whenever the conveyor has a piece i had a POU in ST to test and store the IDs into the global array:</p> <div class="codehilite"><pre><span></span><span class="k">IF</span><span class="p">(</span><span class="n">PLANTA</span><span class="p">.</span><span class="n">L1</span><span class="p">.</span><span class="k">full</span><span class="p">.</span><span class="n">x</span><span class="p">)</span> <span class="k">THEN</span> <span class="n">gvl</span><span class="p">.</span><span class="n">Track_ID</span><span class="p">[</span><span class="mi">1</span><span class="p">]:</span><span class="o">=</span> <span class="n">PLANTA</span><span class="p">.</span><span class="n">L1</span><span class="p">.</span><span class="n">pieceID_O</span><span class="p">;</span> <span class="n">END_IF</span> <span class="k">IF</span><span class="p">(</span><span class="n">PLANTA</span><span class="p">.</span><span class="n">L0</span><span class="p">.</span><span class="k">full</span><span class="p">.</span><span class="n">x</span><span class="p">)</span> <span class="k">THEN</span> <span class="n">gvl</span><span class="p">.</span><span class="n">Track_ID</span><span class="p">[</span><span class="mi">2</span><span class="p">]:</span><span class="o">=</span> <span class="n">PLANTA</span><span class="p">.</span><span class="n">L0</span><span class="p">.</span><span class="n">pieceID_O</span><span class="p">;</span> <span class="n">END_IF</span> </pre></div> <p>The logic behind the idea looks fine, but for some reason isn't working. <br/> Do you have any idea how i could flow that piece indentifier and store it effectively?</p> <p>Thank you!</p></div>