Post by timvh on Codesys 3.5.18.60 – Application Loss and Persistent Data Corruption ^{CODESYS Forge talk (Post)}
Which device do you use? Does this have persistent memory (e.g. NVRAM) available? Maybe first ask your PLC vendor about the possibilities and how they advice to use persistent variables? If you have no NVRAM available, CODESYS will store the variables in a file when the device gracefully shuts down. But on an abrupt power failure, this is not possible. If you have no NVRAM and you want to use persistent variables, then consider using a UPS. In this case when the power is lost, the UPS can keep the power on the PLC which then can gracefully shut down. Alternatively use the Persistence Manager to store the variable values in a file e.g. only on change. See: https://content.helpme-codesys.com/en/CODESYS%20Application%20Composer/ac_pm_overview.html
Last updated: 2025-08-26

Post by pernockham on AC Persistence - values are not read from file during start? ^{CODESYS Forge talk (Post)}
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? To note. To make a manual edit of a variable I tried some different approaches this is what worked for me. "system/online edited" gvl_var.example_variable REAL:F16#2FFB334H-4 767.7 "manually edited" (with runtime stopped followed by a "cold start" to read from file) gvl_var.example_variable REAL:790.1 (the system will use the manual value but will not set an equivalent "hex" value until next online edit/write cycle)
Last updated: 2025-09-03

Post by alexgooi on Is it possible in the log to see previous shutdown ^{CODESYS Forge talk (Post)}
Hi DavidBo, In general Codesys is used to control equipment and an exception is the worst thing that can happen in your installation. If you cannot prevent the exception from triggering, you could implement a Try catch statement, with this solution your controller keeps on running and you are able to handle the exception. __TRY //This statement will trigger an exception Result := 4/0; __CATCH(exc) //Handle the exception HandleException(exc, strExceptionText => strExceptionText); // From the Codesys help file //Create a log file //-------------------------------------------------------- __ENDTRY What you also could do is implement implicit checks, these functions cover most of the exceptions (like dividing by zero) See picture But in general avoid a complete controller shutdown!
Last updated: 2024-02-09

Post by khaledkhalil on Import OPC UA model to Codesys ^{CODESYS Forge talk (Post)}
I have added a models in SiOME which a software to design nodes and add instances. and created a resultant xml file. I tried to import the xml file to Codesys through OPC UA information model Repository the problem i don't know how to view my objects which i have designed. and map it to my PLC to make viewable on my server UaExpert. I watched the tutorial video https://youtu.be/aJhzN3Uk-Do?feature=shared. But it only give you how to add the Information model, and my resultant model doesn't have information type. So how in Codesys i can view a model which i have designed in SiOME and mapped my instances (Objects, Variable or methods) with my Variables in PLC I saw people do it in Tia Portal or other Software, but i have no clue how to do it on CODESYS
Last updated: 2024-03-12

Post by s1mon on Two OneWireMaster on one Raspberry PI 5 ^{CODESYS Forge talk (Post)}
I don't know why the EtherCat fails, but what happens is: First I have only one 1WireMaster running on my Raspberry Pi and EtherCat is running fine. Then I'd like to add a 2nd 1WireMaster. Therefore I enable a 2nd GPIO Pin on the raspberry in the file "/boot/firmware/config.txt". dtoverlay=w1-gpio,gpiopin=4,pullup=0 dtoverlay=w1-gpio,gpiopin=23,pullup=0 To be able to use this 2nd 1WireMaster in Codesys Runtime I Adjust the CODESYScontrol.cfg file and add there: PlaceholderFilePath.2=/sys/devices/w1_bus_master2, $OneWire2$ After a reboot the EtherCat Master is not working any more. I didn't even add a 2nd OneWire Master in Codesys, but still if I do the EtherCat does not work. Do you have an idea why?
Last updated: 2025-10-21

Post by lucaver89 on Raspberry pi 3 and runtime 4.9.0.0 ^{CODESYS Forge talk (Post)}
Good morning, I'm using a raspberry pi3 as plc with the runtime 4.9.0.0. My program has many of retrain variables but when an update is performed the retrain variables comes back to default values. Is the a way to backups the retrain variables n a csv file? Is still the way to restore them from the csv? Thank you for helping Luca
Last updated: 2023-09-23

Post by damian177 on RPi, Codesys , RS232 ^{CODESYS Forge talk (Post)}
Hi, so far I have only used one com port - built-in interface in RPi - RS232 (dev/serial0) as COM1 in Codesys, and my CODESYControl_User.cfg have congiuration like below: [SysCom] Linux.Devicefile=/dev/serial portnum := COM.SysCom.SYS_COMPORT1 Actually I added to my Rpi Hat with 2xRS232 (SPI). - /dev/spidev0.0 and /dev/spidev0.1 How I should change my CODESYControl_User.cfg file to use added porta as COM2 and COM3 in Codesys ?
Last updated: 2023-10-05

Post by sean-barton on FILE_OPERATION_DENIED ^{CODESYS Forge talk (Post)}
I have code written since version 3.5.16 to access the USB drive, how can I do that now the file access has been taken away? I have tried adding a sybolic link to the usb drive in the following directories: /var/opt/codesys/PlcLogic/ /var/opt/CODESYS/PlcLogic/ /opt/CODESYS/PlcLogic/ I still recieve a "FILE_OPERATION_DENIED" response when accessing the USB drive.
Last updated: 2023-10-13

Post by chiali on Recipe issue. ^{CODESYS Forge talk (Post)}
Hi Everyone, I'm trying to make a simple Recipe project using 'Save Recipe In File' and 'Load and Write Recipe' Execute Command buttons in Visualization but No dialog box 'Save As' appears when I click on buttons (Nothing happens). What is wrong. Please see the attached files. Best Regards, Chiali.
Last updated: 2023-10-23

Post by totorovic on CSVReaderInit returns error : INVALID_HANDLE ^{CODESYS Forge talk (Post)}
We changed the path where the CSV file is. From intern memory of the IPC to a USB key. We still have this error 'INVALID_HANDLE'. We must restart the Codesys runtime to clear it. That is a big problem for us because machine is in production. @eschwellinger What do you mean by "this is a security issue not to read/write in the plc allowed path"
Last updated: 2023-10-27

Post by soped on How to generate EtherCat xml from command line ^{CODESYS Forge talk (Post)}
Hi Under tools->customize I have added the command "Generate ethercat xml" to my project so that I can export the configuration as an xml file. I can't find a way how to run that command from CLI, is that even possible and if a script is needed I would appreciate an example ?
Last updated: 2024-06-27

Post by soped on How to generate EtherCat xml from command line ^{CODESYS Forge talk (Post)}
Hi I'm using codesys 3.5 SP4 Under tools->customize I have added the command "Generate ethercat xml" to my project so that I can export the configuration as an xml file. I can't find a way how to run that command from CLI, is that even possible and if a script is needed I would appreciate an example ?
Last updated: 2024-06-27

Post by elerensx on Uninstall Codesys2.3 got RUNDLL There was a Problem Starting error ^{CODESYS Forge talk (Post)}
Try to repair Codesys2.3 and need to uninstall and reinstall it. Got this RUNDLL message when uninstall Codesys 2.3: There was a problem starting, the specificed module could not be found. Please refer to attached file. Followed suggestions from Microsoft website and didn't work out. I am using Codesys2.3.9.16. Any help is appreciated.
Last updated: 2024-07-15

Post by jmfernandes on OpenDir always in error ^{CODESYS Forge talk (Post)}
Thanks for the answer Tim. I am using the codesys version 3.5 SP16, is this also affected or only after version 19? But now at leastI know that is an acess problem to the file and not something else. Unfortunately the link you posted on 2023 are now dead, but I will investigate!
Last updated: 2024-08-01

Post by micik on SysFileOpen not working ^{CODESYS Forge talk (Post)}
Hi, I have the same problem. Some of the libraries I created over time depend on writing files to a folders like c:\Temp. I can confirm that proposed solution is not working with 3.5.20 Patch 2. Can you please specify wich exactly .cfg file needs to be modified and in what way, in order to include c:\Temp in the SysFile path? Thank you!
Last updated: 2024-08-17

Post by talhaali on Persistent variables not working for Control Win ^{CODESYS Forge talk (Post)}
Hi everyone, I am facing issues with persistent retain variables. It was working fine. I added a few new Persistent variables and it stopped working. If I do cold reset it holds persistent variable values. But when I close control win gracefully, and opens it again then it does not. Even, it is not saving ret file in application.
Last updated: 2024-09-10

Post by mtnkyr on Runtime Problem connecting to Keyence IV-500MA Camera ^{CODESYS Forge talk (Post)}
I have to use Keyence IV-500MA Camera for a project. Actually I can use physical connection but I tried to connect using Ethernet protocol so I added its EDS file but I took a lot of errors. Could you help me to solve this problem?
Last updated: 2024-12-26

Post by mtnkyr on Runtime Problem connecting to Keyence IV-500MA Camera ^{CODESYS Forge talk (Post)}
I have to use Keyence IV-500MA Camera for a project. Actually I can use physical connection but I tried to connect using Ethernet protocol so I added its EDS file but I took a lot of errors. Could you help me to solve this problem?
Last updated: 2024-12-26

Post by pernockham on Preferred way of managing Ip-adress/es for linux (debian) host? ^{CODESYS Forge talk (Post)}
I have a debian linux host running Control SL. I tried to manage IP-addresses through codesys/Control SL but that was not successful. What works though is manually editing the network-interfaces config file. /etc/network/interfaces. Is there a way to set this up so that IP-addresses can be managed from within codesys instead? Thanks! / Per
Last updated: 2025-01-22

Post by fabiodasilveira on PLC Shell commands via ST Code ^{CODESYS Forge talk (Post)}
Thank you, Bingo. I have added the instructions below to the CODESYSControl.cfg file, but they haven't changed anything. [SysSocket] Adapter.0.Name="ETH0" Adapter.0.EnableSetIpAndMask=1 Adapter.1.Name="ETH1" Adapter.1.EnableSetIpAndMask=1 Regarding your second suggestion, could you please expand a bit on that?
Last updated: 2025-03-03

Post by mucleus on How do I fix ";Internal Error (x86-64): Invalid type size" error? ^{CODESYS Forge talk (Post)}
I opened the project file of version 3.5.19.7 in 3.5.21.0. I updated all the environment of the project to the latest and compiled it. When I compile it, I get an error ";Internal Error (x86-64): Invalid type size". How can I fix this error? I will wait for your help.
Last updated: 2025-04-15

Post by ganassa on Custom colors in Ladder diagrams? ^{CODESYS Forge talk (Post)}
How can I change the default color - blue - for active lanes, contacts and coils? I'd like a lighter color. After having failed in finding a related option in the IDE, I've looked at the "Default.editortheme" file in CODESYS' directory, but couldn't see any related option. Thank you
Last updated: 2025-07-09

Post by jami on Reading multiple lines from csv file ^{CODESYS Forge talk (Post)}
Hello, i am trying to read multiple lines from csv file with caa file library and oscat. I have wrote 7 lines in the csv with separation '$R$L'. In my "extracting values" part I check line feeds and chars. After that I convert my buffer to string with oscat but I'm only able to read the first line from the csv. No matter if I even change start position where I start converting the buffer, I only get the first line. Here's my code for the reading and extracting value parts: 4: (*Reading the file*) fileread.hFile := filehandle; fileread.pBuffer := ADR(buffer); filesize1:=SIZEOF (buffer); fileread.szbuffer:=filesize1; fileread.udiTimeOut := 100000; fileread(xExecute := TRUE); IF fileRead.xDone THEN iFilesize:=TO_INT(fileread.szSize); writestate:=3; fileRead.xExecute := FALSE; END_IF 5: (*Extracting values*) //here i check the number of line feeds and chars. It works WHILE i < ifilesize DO c:=buffer[i]; IF c= 10 THEN IF lineindex<=99 THEN lineIndex := lineIndex + 1; END_IF ELSIF c <> 13 THEN IF charIndex <= 1000 THEN charIndex := charIndex + 1; END_IF END_IF i := i + 1; END_WHILE // Here i convert the buffer to string and transfer it to filelines:ARRAY[0..99] of string[254]. trig(CLK:=BUTTON); IF trig.Q THEN fileLines[i2]:=oscat_basic.BUFFER_TO_STRING(PT:=ADR(buffer), Size:=TO_UINT(fileread.szBuffer), start:=TO_UINT(bufferStart), stop:=TO_UINT(filesize1)); i2:=i2+1; bufferstart:=bufferstart+80; END_IF If anyone has idea how to read multiple lines, it would be nice. Even if you have example codes that work, that would help a lot.
Last updated: 2025-07-18

Post by timvh on Reading multiple lines from csv file ^{CODESYS Forge talk (Post)}
Not sure, but maybe before you enter step 5, set i, lineindex and charIndex to 0. And the buffer variable should have a size bigger than 1 line. Additionally I think you should set bufferstart to 0 before you enter step 5. And in the OSCAT function you always point to the buffer address, but shouldn't this be (buffer + bufferstart)?
Last updated: 2025-07-23

Post by jcarter on Webvisu Combined Authentication ^{CODESYS Forge talk (Post)}
Is there a way to have both a Public No Login Screens with Screens that do require login and File Transfer? My Idea is to have the default page be View Only with a Login Button in the Corner and then Once Logged In you can change settings and download files depending on your user group.
Last updated: 2025-08-28

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