https://forge.codesys.com/forge/talk/Engineering/thread/72ff30de87/2022-08-09T15:19:30.726000ZRecent posts to BadTooManyOperations after changing array dimension from 80 to 1602022-08-09T15:19:30.726000Z2022-08-09T15:19:30.726000Zstrulandhttps://forge.codesys.com/u/struland/https://forge.codesys.com796d9047337c3fbc1c8f95d960f46d41896500cd

<div class="markdown_content"><p>In Codesys PLC 3.5.SP12 (32-bit) project the OPCUA Server feature is acitvated.<br/> The OPCUA client is a node-red (2.2.2) flow. With node-red-contrib-opcua (0.2.282) the READMULTIPLE action is implemented. <br/> It worked very well with roughly 6000 datapoints.</p> <p>Recently there was a need to increase an Array Constant from 80 to 160.</p> <div class="codehilite"><pre><span></span><span class="n">b_Ventilator</span><span class="o">:</span> <span class="n">BYTE</span> <span class="o">:=</span> <span class="mi">160</span><span class="o">;</span> <span class="c1">// with :=80; it worked</span> <span class="n">BX_Vnn1_AlVnnStoer</span><span class="o">:</span> <span class="n">ARRAY</span> <span class="o">[</span><span class="mi">1</span><span class="o">..</span><span class="n">Konst</span><span class="o">.</span><span class="na">b_Ventilator</span><span class="o">]</span> <span class="n">OF</span> <span class="n">BOOL</span><span class="o">;</span> <span class="c1">// alarm contact ventilator</span> </pre></div> <p>After the increase the client throws the error:</p> <div class="codehilite"><pre><span></span><span class="err">Client node error on: READ MULTIPLE error: ["READ MULTIPLE error at active reading: serviceResult = BadTooManyOperations (0x80100000)"]</span> </pre></div> <p>A quick research suggested, that the error is caused by the OPCUA Server. Which would be the CoDeSys PLC in my case.<br/> <a class="" href="https://github.com/node-opcua/node-opcua/issues/222#issuecomment-285337387" rel="nofollow">github</a><br/> <a class="" href="https://forum.unified-automation.com/viewtopic.php?t=2181" rel="nofollow">unified-automation</a></p> <p>And that there might be a limit of 100 items.<br/> <a class="" href="https://forge.codesys.com/forge/talk/Engineering/thread/29dfa7151e/">forge</a></p> <p>This I could verify. With UA Expert inspecting Server - ServerCapabilities - OperationsLimits<br/> 100 MaxMonitoredItemsPerCall<br/> 100 MaxNodesPerBrowse<br/> 100 MaxNodesPerRead<br/> 100 MaxNodesPerRegisterNodes<br/> 100 MaxNodesPerTranslateBrowsePathsToNodeIds<br/> 100 MaxNodesPerWrite</p> <p>Is there an easy option to change the limits to 160?</p> <p>Has anyone stumpled upon a similar problem? How did you solve it?</p></div>