Post by jerry-sorrells on Find Function: Object reference not set to an instance of an object. ^{CODESYS Forge talk (Post)}
Build: CODESYS 3.5 SP19 Patch 1 (64-bit) Host OS: Windows 10 Target: Linux SL I have a project with programs in Structured Text and Ladder Diagram. When I try to use the Find function, it works for the Active Editor; however, when I try to use Find for the Entire Project, I get the error "Object reference not set to the instance of an object." I know what this error means in the context of the program, but I have no idea why the find function is returning this error. The variable I am searching does not matter: it happens with all variables. Any help with this will be greatly appreciated. I generally use the Find function quite often as I am developing and not having it is really slowing me down.
Last updated: 2023-10-23

Post by dekelec on The current baud rate could not be determined in CR0020 IFM with maintenance tool ^{CODESYS Forge talk (Post)}
It could be a problem with the cable pinout on either side: 9 pin D-SUB connector (male) - PC side Pin Potential: 1 n.c. 2 RxD 3 TxD 4 n.c. 5 n.c. 6 GND 7 n.c. 8 n.c. 9 n.c. Shell Shield Check if TxD and RxD cross between pins 2 and 3 (what is the Recive signal/wire to one device it's a Transmit signal/wire for the othe device) or with COM port settings: Bits per second: 9600 Data bits: 8 Parity: None Stop bits: 1 Flow controll: None
Last updated: 2024-07-09

Post by mubeta on Reset problem with CMZ SD/SVM drive ^{CODESYS Forge talk (Post)}
In a recent project with SoftMotion 4.15.0.0, where I integrated two SD drives from CMZ (from catalogue EDS and not imported), on CANopen bus, I found that the SoftMotion MC_Reset function does not reset the drive faults. Even if the drive is in fault, either on the device or on the drive at the CoDeSys level, the function does not reset, instead reporting the error code: no error to reset. Finally, I had to connect the reset bit of the ControlWord directly to a tag in my program. Something I never had to do on other drives: Lexium, etc. all reset simply with MC_Reset.
Last updated: 2024-07-24

Post by paulpotat on Exclude traces when searching with ctrl+F ^{CODESYS Forge talk (Post)}
Hello, I was wondering if there is a way in codesys to exclude the traces from the search when using the "ctrl+F" window ? That would be nice to improve the search functionnality when looking for a specific variable. Sometimes when I iterate through all occurences with the "find next" button, it opens the trace configuration window. I would expect to be able to close it and go to the next occurence with the "find next" button, but after closing the trace configuration window the search says it has reached the end of the scope (even if in reality there are other occurences of the variable elsewhere). I tried to enable / disable the "search up" checkbox but it's not changing anything. I hope somebody have insight on this, BR
Last updated: 2024-08-06

Post by pernockham on Linking to IO during runtime with hot swap? ^{CODESYS Forge talk (Post)}
I have a project where a single PLC shall control multiple nodes (up to 10 units?) with IO connected through profinet. Ideally each node should be identical however with time I see situations were different setups/configurations will be used. Codesys PLC (GVLs) |Profinet | |--PNIO-node-1--| | | AIO, | | DIO, | | CNT etc. | |--PNIO-node-2--| | | AIO, | | DIO, | | CNT etc. Ideally I think of a configuration through yaml/xml-files (the assignment/linking of the profinet nodes towards GVL-variables in the PLC as well as scaling, channel configration etc.). Would be grateful if someone could suggest library/-ies that can handle the following: - Verify what IO is connected to a device/node. - Hot-swap/assign link for IO towards GVLs, either automatically or through a HMI.
Last updated: 2024-10-11

Post by r-c-r on SM3RaspiStepper 0.0.0.6 issue ^{CODESYS Forge talk (Post)}
Hello, I noticed that version 0.0.0.6 is now available, so I tested it using CODESYS V3.5 SP19 Patch 7 and SoftMotion 4.17.0.0. While the project compiles and downloads without issues, I encountered a problem with the 'Enable: GPIO pin number that is set when the axis is enabled (with MC_Power) (0: not used)' functionality — it no longer works (HIGH level not present at the output pin). I observed the same behavior with version 0.0.0.5, whereas version 0.0.0.4 functions correctly. Could you help me identify what might be causing this issue or suggest how to resolve it? Thanks.
Last updated: 2025-03-19

Post by beginner on ERROR: Demo mode for SoftMotion Basic expired. Feature stopped! ^{CODESYS Forge talk (Post)}
Hello. Please help me. Sometimes SoftMotion starts in demo mode and stops working after 2 hours. When I check with the license manager, it is recognized normally. I checked the log. After changing online or logging in with a download, the message "**** ERROR: Demo mode for SoftMotion Basic started. Will expire and stop!" was left. Even if you change online or log in with a download, this phenomenon may not occur. Please tell me how to solve this problem. Thank you in advance. Codesys Ver 3.5.20.0 SM3 Basic SoftMotion Ver 4.16.0.0 ※This text was translated using a translator.
Last updated: 2025-03-25

Post by jeroenaero on Targetvisualisation full screen with CmpTargetVisu settings ^{CODESYS Forge talk (Post)}
Hi, How can i display targetvisualization in full screen on the target device? I installed Targetvisu For Linux SL 4.16.0.0 on target device which contains Raspberry PI 64bit PIXEL desktop. When i connect my PLC program to the remote targetvisu, the targetvisu displays for 60% horizontally. We contacted CODESYS and they said it is a bug. they had a workaround, and with the settings below added to the file /etc/codesysvisualization/CODESYSVisualizationTV.cfg, the targetvisualization display for 100%, but with the taskbar at the top. VisuClient.BestFit=1 ;VisuClient.ScaleTypeIsotropic=0 VisuClient.FillWholeBackground=1 [CmpTargetVisu] WindowPositionX=0 WindowPositionY=0 WindowSizeWidth=1280 WindowSizeHeight=800 WindowType=2 How can we let it display fullscreen without taskbar?
Last updated: 2025-07-24

Post by voffi on projects.open not working for file based storage project ^{CODESYS Forge talk (Post)}
Hello! Opening a project from a python script given at the CODESYS command line does not work for me with a file based storage project. Example: Running projects.open("test.project", primary = True) works but converting the project to a file based storage project and then give the folder name as an argument to project.open Running projects.open("test.fbsproj", primary = True) does not work. We decided to work with file based storage for the project. Is there a scripting API for file-based storage to e.g. convert it while running the script back or how to open file based storage project with projects.open? Thank you! voffi
Last updated: 2025-09-05

Post by pernockham on Control for linux SL, 4.14.0.0 -> 4.15.0.0 breaks web page access. URL requires authentication ^{CODESYS Forge talk (Post)}
I have a problem which I have identified with a device-update from 4.14.0.0 to (4.15.0.0-4.17.0.0) where the newer versions will stop any local access to the internal web page with the browser responding "The requested URL requires authentication". Setting the device back to 4.14.0.0. the web page will respond. Access to web page through Automation server is possible also for the newer version, but not "local" access. Runtime (Codesys control for linux SL) is on 4.17.0.0. I have tried to manipulate settings for 'Access-Control-Allow-Origin' '*' always; through nginx (normally a proxy_pass to localhost:8080). Also tested bypassing nginx by accessing 8080 directly with the same result.
Last updated: 2025-09-08

Post by dhumphries on No source code available ^{CODESYS Forge talk (Post)}
Try using an Ethernet/IP scanner instead of an adapter, I'm guessing the 2 devices you're trying to communicate with are adapters, you have to have a scanner somewhere and Codesys should be a scanner. I don't know why you're getting the error, you should be able to use your Ethernet port as an EthernetIP adapter (although I've never had a reason to try,) but it's probably not what you wanted to do, unless you're connecting to another PLC that is a scanner. Good luck configuring the devices you're trying to connect to, it will be a lot easier if you have an .EDS file instead of starting with a generic module, even with an .EDS it can be tricky getting the communication working.
Last updated: 2024-02-03

Post by lzml on Safety ^{CODESYS Forge talk (Post)}
I have a problem with a project that uses EtherCAT Safety. The project is developed with CODESYS version 3.5.19.20, runtime 3.5.18.30, safety CPU EL6900 4.3.1.0, TCEL6900FBS 3.5.1.10, IODrvEL6900 4.3.1.0, IODrvEtherCAT 4.1.0.0. The safety project works correctly, but when I download the PLC project for modifications, the ESM objects are no longer aligned with the states inside the safety program. Specifically, inside the safety program, they are seen as true, while outside the safety program, the state is reported as false, but not for all ESMs, only some. I have already tried to completely redo the safety from scratch, but nothing has changed. Any solutions? Thanks
Last updated: 2024-05-24

Post by artem1223 on Synaxis of library declarations in the ST ^{CODESYS Forge talk (Post)}
Codesys 3.5 17.30, plc - crevis GN-9373. I need to use RTC of pls for write in registers (need to check difference of writen 100 and 200 registers). For this i try to use SysTimeRtc (SysTimeRtc.SysTimeRtcGet) but its not working. After it i tryed to use SysTimeGetMs and something like this but still not working. Library? Mb but check project, SysTime with SysTimeRtc already, all what i know - already is here. Its my first try to learn ST (early used fbd and ladder, yeah), pls help with it. Mb problem with a syntaxis, but im not sure.
Last updated: 2025-11-26

Post by jbcregen on Accessing parameters from a structure or function block with the web interface ^{CODESYS Forge talk (Post)}
I have a project with hundreds of OPC-UA variables available on the network. A lot of these variables are used actively in various scripts that run in background in the OS (Linux). I'm experimenting with Automation Server and I have a hard time understanding how the web interface populates its parameters list for a given PLC (<plc details="" parameters="" for="" plc="" 'xyz'="">).</plc> In this page, it looks like the only variables available are the ones that are of a "base" type : bool, TIME, String, INT, etc. All the variables that are nested into function blocks or structures are not available in the web interface, even if they are available to any OPC-UA client. Is this a limitation of the Automation Server or is there something that can be done in Codesys?
Last updated: 2025-12-01

Post by gatto on Backtick identifiers ^{CODESYS Forge talk (Post)}
Hello, I’m in Codesys 3.5.20.40 and I try to declare the variable ´var1´ but I get an error. here : https://content.helpme-codesys.com/en/CODESYS%20Development%20System/_cds_rules.html i read : Backtick identifiers By using backticks, characters can also be used in identifiers that are not normally permitted in identifiers, such as special characters. The acute accent character is used for backticks: ´ (Unicode: U+02CA) The use of backticks is recommended in order to be able to use the same identifiers in CODESYS as in other programming languages or documents, such as circuit diagrams. Any character may be used between two backticks, except line breaks and other backticks. Keywords are also allowed as identifiers between backticks. Examples: ´Variable+9´ ´INT´ The backticks are part of each identifier and therefore var1 and ´var1´ are two different identifiers. Example PROGRAM PLC_PRG VAR var1 : INT; ´var1´: INT; END_VAR var1 := var1 + 1; ´var1´ := 12; Are there any limitations or is something missing in my development environment?
Last updated: 2025-10-28

Post by jst69 on Python script: Launch Codesys, Execute Script, Exit Codesys ^{CODESYS Forge talk (Post)}
Dear all: Question about scripting: I am creating a .NET program that is supposed to Open codesys, open template project, export a bunch of pou, then exit codesys. Launch works, Open project works, Export works, But how do i tell codesys to close itself? I can tell windows to terminate codesys, but i would prefer to do it properly. from __future__ import print_function import sys import System proj = projects.primary # We're interested in POU nodes: POUGuid = Guid("6f9dac99-8de1-4efc-8465-68ac443b7d08") # We collect all POU nodes in that list. pous = [] # From the parent node on, we recursively add POU nodes: def CollectPous(node): if node.type == POUGuid: pous.append(node) else: for child in node.get_children(): CollectPous(child) # Now we collect all the leaf nodes. for node in proj.get_children(): CollectPous(node) # We print everything just to know what's going on. for i in pous: print("found: ", i.type, i.guid, i.get_name()) # And now we export the files. for candidate in pous: # We create a list of objects to export: # The object itsself objects = [candidate] # And sub-objects (POUs can have actions, properties, ...) objects.extend(candidate.get_children()) # And the parent folders. parent = candidate.parent while ((not parent.is_root) and parent.is_folder): objects.append(parent) parent = parent.parent # Create an unique file name: if len(sys.argv) == 1: filename = "parent\\%s.export" % (candidate.get_name()) else: filename = "%s\\%s.export" % (sys.argv[1],candidate.get_name()) # print some user information print("exporting ", len(objects), " objects to: ", filename) # and actually export the project. proj.export_xml(objects, filename) proj.close() print ("script finished.") System.exit(0) // Dont work .NET: public static void Export(string path,string proj) { if (checkSettings()) { var p = new System.Diagnostics.Process(); p.StartInfo.FileName = Properties.Settings.Default.CSVersion +"\\CODESYS\\Common\\CODESYS.exe"; p.StartInfo.Arguments = " --Profile=" + qoute(Properties.Settings.Default.CSProfile) + " --culture=en" + " --project=" + qoute(path + "\\" + proj) + " --runscript=" + Properties.Settings.Default.LastOpenProjectPath + "\\INPUT_DATA\\SCRIPT\\Export.py" + " --scriptargs:" + qoute(path) ; p.StartInfo.RedirectStandardOutput = true; p.StartInfo.UseShellExecute = false; p.StartInfo.CreateNoWindow = false; p.Start(); p.StandardOutput.ReadToEnd(); p.CloseMainWindow(); p.Close(); } }
Last updated: 2024-01-16

Post by robinluckey on IDE window handling bugs, windows diasppear, multi monitor setups ^{CODESYS Forge talk (Post)}
Codesys Windows (Main window as well as pop-ups) often appear outside of the viewable are in Windows when using multiple Monitors. This is exacerbated (happens more very often), when working on a notebook with different Monitor setups at different locations (which kind of is standard nowadays). The windows (not even the main Window) can not be recovered using standard short cuts like WIN + Arrow keys, alt + tab etc. The only way we found to recover the windows is by changing the Monitor positions in thew Windows Display Settings and than changing them back EVERY TIME a pop us is displayed. This makes using Codesys close to unbearable. All my colleagues face the same problem and do not have this problem with any other IDE. Please help.
Last updated: 2024-10-11

Post by taqamert on CANopen PDO Issue with Pressure Sensor in Codesys ^{CODESYS Forge talk (Post)}
Hello everyone, I am using an IFM CR0303 model PLC, which has a tilt sensor and a pressure sensor connected via CANopen. Both sensors are from the same brand (ATEK). I can read data from the tilt sensor without any issues, but I am unable to read data from the pressure sensor. I have added the EDS file in the PLC configuration and adjusted the node-ID settings. When I check with the PCAN-View application, I can see that the selected PDOs are coming through, but the data is not reaching the Codesys side. What could be the issue, and what can I try to resolve it? Can anyone help me?
Last updated: 2024-10-22

Post by jeroenaero on CodeSys Raspberry pi I2C driver not found ^{CODESYS Forge talk (Post)}
Hello, We have a problem with CodeSys on a raspbery pi with an ADS1015 analog to I2C module. It can't find the I2C device on the i2c bus, it says No I2C Driver Found. When we use the RPI terminal we can find the I2C device and read it out. The i2c-1 bus is also accessible from codesys. The device address of the Analog to I2C module is 0x48. Can someone have a look what the problem is? i submitted the screenshots in the attachments. i also include the device description and library.
Last updated: 2024-11-07

Post by tyleretn on Codesys 3.5 SP18 P4 Freezing on Library Update ^{CODESYS Forge talk (Post)}
I have created a library with both code and visualizations to be used in multiple other projects. After I update the library version into the library repository, I have much difficulty updating the version into the main project. I can always update the library version in the Library Manager just fine. My issue, is sometimes Codesys will freeze when opening the visualization that uses the library visualizations. Sometimes it opens, but freezes when I try to access the library visualizations from the Visualization Toolbox. I try letting Codesys run for upwards of 4+ hours and it is stuck in this state. On very rare cases I have no issues and can continue with my work. I haven't found a consistent reason or work around. Has anyone else had this happen?
Last updated: 2025-02-27

Post by benemenn on OPC UA Method - How to wait for result? ^{CODESYS Forge talk (Post)}
so from what i've learned. Codesys OPCUA Server can only provide OPC UA Methods, when they are created in an XML Model beforehand. So you have to create the XML Model with OPC UA Methods. Then load that model into codesys and create the IEC Blocks. This is automated Code and will create all the variables and Methods from your XML Model. Then they will be displayed on discovery with an OPC UA Client. As far as I understood. There is no way for Methods to be shown in OPC UA when not using an external XML Informationmodel. Codesys can not yet create the informationmodel on itself. Regards
Last updated: 2025-04-02

Post by benemenn on OPC UA Method - How to wait for result? ^{CODESYS Forge talk (Post)}
so from what i've learned. Codesys OPCUA Server can only provide OPC UA Methods, when they are created in an XML Model beforehand. So you have to create the XML Model with OPC UA Methods. Then load that model into codesys and create the IEC Blocks. This is automated Code and will create all the variables and Methods from your XML Model. Then they will be displayed on discovery with an OPC UA Client. As far as I understood. There is no way for Methods to be shown in OPC UA when not using an external XML Informationmodel. Codesys can not yet create the informationmodel on itself. Regards
Last updated: 2025-04-02

Post by mark on IO link on IFM AL133x only single digital input on a channel ^{CODESYS Forge talk (Post)}
I have a problem with the CODESYS IO-Link SL software. When I insert a IO link master AL1332 and plug a discrete digital input to a channel it reads only 1 of the 2 available inputs on that channel. Is there anyone who sorted out if the second input is also usable? When we configure the module without the CODESYS IO-Link SL software then the second input on the channel can be used. At the moment we use some channels on a module as IO-link port, and some as discrete IO. It would be very nice if we can use both inputs on a channel with the use of CODESYS IO-Link SL.
Last updated: 2023-12-18

Post by timvh on CODESYS V3.5 SP15 Patch 2 won't open ^{CODESYS Forge talk (Post)}
This is almost always related to previously working with an additonal monitor. If you have placed CODESYS on that monitor, later start your laptop again and open CODESYS without that monitor, then Windows still places it in the previous position, but then it is not visible. So the solution by cehermanstad can be used to move it to the main screen to make it visible again. PS, another way to move it, is by pressing SHIFT and then right-click on the icon in the task bar, then select move. You can then move it with the arrow keys or your mouse.
Last updated: 2024-02-27

Post by nilesh on Request for Assistance with Online Logic Changes in PLC System using Codesys ^{CODESYS Forge talk (Post)}
Dear Sir, We are writing to seek guidance regarding our current situation with the Opto 22 Groov EPIC PR1 PLC system. Over the past year, we have successfully downloaded and implemented logic using Codesys, and the PLC has been operational without issues. However, we now require minor modifications to the logic. Despite attempting to upload the modified logic, we are unable to see the "online change" option, prompting us to consider a direct logic download. Our concern is that during this process, certain digital outputs or analog outputs might momentarily disrupt operations, which is unacceptable given the system's continuous 24x7 operation. We have explored online changes in other PLC systems, but due to the absence of the last downloaded backup, we are unable to proceed confidently.
Last updated: 2024-03-01

Sort by relevance or date