https://forge.codesys.com/forge/talk/Engineering/thread/e2cc46f1e0/2025-09-03T16:07:39.777000ZRecent posts to AC Persistence - values are not read from file during start?2025-09-03T16:07:39.777000Z2025-09-03T16:07:39.777000Zpernockhamhttps://forge.codesys.com/u/pernockham/https://forge.codesys.com6f58f92b53b4e08a136053577a6512636bf6cb7c

<div class="markdown_content"><p>For the protocol. What also works is to do the process via ssh (using runtime on linux)</p> <p>sudo /etc/init.d/codesyscontrol stop<br/> modify the persistence file values<br/> sudo /etc/init.d/codesyscontrol start</p></div>

2025-09-03T07:50:01.575000Z2025-09-03T07:50:01.575000Zpernockhamhttps://forge.codesys.com/u/pernockham/https://forge.codesys.comaa9dab7f2039856f42be970346a1e649c47481d0

<div class="markdown_content"><p>I swear I tested this like 20 times yesterday without success. Repeated it today and it works. Maybe the system needed a "real" power reboot? </p> <p>To note. To make a manual edit of a variable I tried some different approaches this is what worked for me. </p> <p>"system/online edited"<br/> gvl_var.example_variable REAL:F16#2FFB334H-4 767.7</p> <p>"manually edited" (with runtime stopped followed by a "cold start" to read from file)<br/> gvl_var.example_variable REAL:790.1<br/> (the system will use the manual value but will not set an equivalent "hex" value until next online edit/write cycle)</p></div>

2025-09-02T14:03:50.278000Z2025-09-02T14:03:50.278000Zpernockhamhttps://forge.codesys.com/u/pernockham/https://forge.codesys.com0ebc9c70f99cd80aaa515c3ed6b079f39f0f75af

<div class="markdown_content"><p>Im struggling with the AC Persistence. </p> <p>AC persistence seems to work for any variable that is changed online and values are kept during reboot. However, if I try to edit the persistence files offline or replace the persistence files with a previously downloaded older persistence file (with modified values), the online value will not follow, as if the system did not at all read the file at boot? </p> <p>My testing sequence. <br/> - Edit a the value of a persistenced variable (with xSaveOnChange = True)<br/> - Save/download <a class="alink" href="/forge/talk-ru/1/">[1]</a> the associated persistence file, (and confirm the value has changed).<br/> - Edit the value online for a second time <a class="alink" href="/forge/talk-ru/2/">[2]</a>. <br/> - Stop runtime<br/> - Replace (upload) the persistence file with my previously downloaded file <a class="alink" href="/forge/talk-ru/1/">[1]</a>.<br/> - Coldstart/Warmstart/Start runtime<br/> - Whatever Im trying the value of my persistence variable will always be equal to that of my second edit <a class="alink" href="/forge/talk-ru/2/">[2]</a> as if the file is not read/considered during boot.</p> <p>What am I doing wrong? </p></div>