https://forge.codesys.com/forge/talk/CODESYS-V2/thread/310e2eb79a/2020-02-27T21:33:57.924000ZRecent posts to Updating Digital Outputs2020-02-27T21:33:57.924000Z2020-02-27T21:33:57.924000Zdgjohnsonhttps://forge.codesys.com/u/dgjohnson/https://forge.codesys.com14ab0db05fadf90d57e80a03e38147db0f119303

<div class="markdown_content"><p>Thanks for the response.</p> <p>It turns out there was a hardware problem with the PLC and a certain combination of IO modules. </p> <p>I have since switched to a Moeller PLC and the same code works fine.</p></div>

2020-02-27T21:33:56.459000Z2020-02-27T21:33:56.459000Zspfeifhttps://forge.codesys.com/u/spfeif/https://forge.codesys.com8732c8c2c0124f85b53523cfba18a363ded38b72

<div class="markdown_content"><p>Outputs will turn on and off if you force them only if the variable is not being called any where else in the code. If a variable is being called in the code, ie the variable bMotorStart := false; and you try to force it from the PLC configuration then it will never turn on. Forcing outputs from variables being called in code as far as I am aware of is an art. Normally the control code is broken into at least three sections. Input section, control section, output section. When there is a need to force the outputs then a bit is set in such a way that no longer calls that output variable so you can manually turn it on and off.</p> <p>if (bForceMode = False) then</p> <p>bMotorStart := bStartEnable;</p> <p>end_if</p> <p>To force the variable bMotorStart set bForceMode = True;</p> <p>As for your outputs not coming on perform a global search for the variable and make sure it's not being called some where else in your code. There is also an option in Project-Options-Build-Multiple write access on outputs menu to force CoDeSys to check for this situation at compile time an report in the message window.</p> <p>Hope this helps.</p></div>

2020-02-27T21:33:52.357000Z2020-02-27T21:33:52.357000Zdgjohnsonhttps://forge.codesys.com/u/dgjohnson/https://forge.codesys.comc597b9c64b6f17dc92d2e3cdc058c51262344c1c

<div class="markdown_content"><p>I'm having a problem updating the Digital Outputs through the code. If I monitor the outputs in Online-PLC Configuration the squares turn blue as if the output is switching, but it doesn't.</p> <p>If I use the Online-PLC Configuration (clicking on the blue square) to switch the outputs the turn on/off correctly. Also when I do this the ones already turned On by the code switch.</p> <p>Is there something needed in the code to force an update of the digital outs?</p> <p>I'm running CodeSys 2.3 on a Kontron ThinkIO-P.</p></div>