Post by baott569 on CODESYS OPC UA Security: HMI Client Not Receiving Server Certificate ^{CODESYS Forge talk (Post)}
Hello everyone, I am currently using OPC UA in CODESYS with the security mode BASIC256SHA256 – Signed and Encrypted. The OPC UA Server is running on an RTE CX device, and the HMI is running on another computer. I have reviewed many CODESYS documents and successfully established communication when the security mode is set to None with Anonymous login. However, when security is enabled, the server does not provide its certificate for the CODESYS HMI client to trust. Interestingly, the client can send its certificate to the server, and UAExpert works normally, but the CODESYS HMI client does not receive the server certificate. Can anyone help clarify what I might be missing? I have been stuck on this issue for three days. If I missed or misconfigured any step, please let me know. I believe I am stuck at step 15 in the following CODESYS guide: Encrypting the Communication of a Data Source OPC UA Client https://content.helpme-codesys.com/en/CODESYS%20Communication/_cds_encrypt_communication_data_sources_opc_ua_client.html Thank you very much.
Last updated: 2026-01-06

Post by mrkm-dic on CODESYS: Combining Master Redundancy with EtherCAT Ring Topology – Is it Supported? ^{CODESYS Forge talk (Post)}
Hello, I would like to ask whether it is technically supported (and practically achievable) to combine CODESYS Master Redundancy with EtherCAT ring (loop) redundancy in the same system. System setup CODESYS version: CODESYS 3.5.21.40 CODESYS Control SL for Weidmuller u-OS-4.12.2.0 Controllers (Masters): Weidmuller UC20-M4000 ×2, configured as Active / Standby using CODESYS redundancy EtherCAT Slaves: Weidmuller UR20-FBC-EC ×3, supporting EtherCAT ring / line break detection Topology: EtherCAT ring (loop) Main question Is it officially supported to use: ・CODESYS PLC/Master redundancy (Active/Standby) and ・EtherCAT ring topology (for cable redundancy) at the same time? Expected behavior Our expectation is: ・When the Active PLC fails, the Standby PLC becomes Active ・The Standby PLC then takes over the role of EtherCAT Master ・EtherCAT communication is re-established ・I/O control continues after reinitialization (a short interruption is acceptable; no strict bumpless requirement) We do not expect completely seamless / zero-cycle switchover, but we want to understand: ・Whether this combination is supported by design ・Or whether there are known limitations or restrictions when EtherCAT ring mode is used together with Master redundancy Clarification At this stage, the question is mainly about feasibility and support, not about a specific error message yet. Any official guidance, limitations, or real-world experience would be greatly appreciated. Thank you in advance.
Last updated: 2026-02-05

Post by bbmussatto on Connetion with Topcon Opus B3 ECO Full display ^{CODESYS Forge talk (Post)}
I have a Topcon Opus B3 ECO Full display and i wanna program it with codesys, but i cant connect it to the display. After creating a new project, i choose the device "Opus B3-B4-B6-3.5.19.50" that is already available in my version of codesys, but i think the problem is that my version of codesys or something else is not the same as the codesys runtime version running on my display. Can anyone tell me how i can see the codesys runtime version on my display? i tried looking in the settings (Daemon > CDS) on the display, but all i see is "N/A" for "Customer Number", "Customer Part Number" and "Customer Serial Number". Can anyone help me make this connection?
Last updated: 2025-10-07

Post by tecnocons on Trouble Writing Files to External Paths in CODESYS ^{CODESYS Forge talk (Post)}
Hello everyone, I'm encountering an issue in CODESYS regarding writing files to external paths. Despite correctly configuring the placeholder in the CODESYSControl_User.cfg file to allow access to an external folder, CODESYS doesn't seem to write any files, and no errors are reported. The issue on the older versions was absent with no placeholders. I've checked the operating system permissions, and they seem to be in order, but the issue remains. Has anyone faced a similar situation or has any suggestions on how I might resolve this problem? Any help would be greatly appreciated. Thank you in advance for your support. I'm using raspberry PI as a logger. RPI3 Buster Codesys 32bit SL V4.11 Codesys Win64 3.5.20 [SysFile] PlaceholderFilePath.1=/home/pi/scan, $SCAN$
Last updated: 2024-04-09

Post by valenting on Can't use new licensing with Raspberry Pi ^{CODESYS Forge talk (Post)}
Hi, I'm using Codesys control for Raspberry Pi in the latest version (4.11.0.0) When I try to install a license with the new application-based licensing, I have an error "returncode 403046401" (using codesys SP18) I updated to codesys SP20, and now I get the following error: "The selected conainer [0]: SN=..., Version=1.18, Chip=0, Rev=0 does not fit to your ticket. Please select a suitable one." The license I'm trying to install is a Codesys Control Basic L license, with a Codesys Visualization L option, according to the needs of my application. What can I do to activate my license ?
Last updated: 2024-04-22

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Last updated: 2024-10-26

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Last updated: 2024-10-26

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Last updated: 2024-10-26

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Last updated: 2024-10-26

Post by kedar on [40% off] Temu Coupon Code ➔ [acq615756] for New and Existing Customers ^{CODESYS Forge talk (Post)}
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Last updated: 2024-10-26

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Last updated: 2024-10-26

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Last updated: 2024-10-26

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Last updated: 2024-10-26

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Last updated: 2024-10-26

Post by naps on cant install runetime on 750-8202 ^{CODESYS Forge talk (Post)}
Hello, im trying to install the 3.5 Runtime on a a fresh image on my 750-8202. Product Description: WAGO 750-8202 PFC200 CS 2ETH RS Firmware Revision: 03.10.08(22) ~~~ df -h Filesystem Size Used Available Use% Mounted on ubi0:rootfs.1 82.5M 66.5M 11.8M 85% / devtmpfs 117.8M 16.0K 117.8M 0% /dev none 118.3M 12.0K 118.3M 0% /tmp none 118.3M 0 118.3M 0% /media none 4.0M 136.0K 3.9M 3% /var/log none 118.3M 112.0K 118.2M 0% /var/run none 118.3M 0 118.3M 0% /var/lock none 118.3M 0 118.3M 0% /var/tmp none 118.3M 0 118.3M 0% /sys/fs/cgroup tmpfs 118.3M 48.0K 118.2M 0% /run /dev/ubi0_1 58.6M 3.4M 52.2M 6% /home /dev/ubi0_1 58.6M 3.4M 52.2M 6% /settings /dev/ubi0_1 58.6M 3.4M 52.2M 6% /log ~ After installation and reboot i have still the wago webinterface. No runtime on Information Tab and the Runtime button from the configuration tab is lost. iv try it with firmware 22 and 21. Same problem. What can i do?
Last updated: 2024-09-29

Post by danp1406 on Question about Demo License limitations for Modbus TCP communication and Fieldbus Instances ^{CODESYS Forge talk (Post)}
Hello everyone, I am currently working with CODESYS Virtual Control for Linux running in Docker on a Debian virtual machine. I am deploying my application using Deploy Control SL, and in my project I am using the ModbusFB library to implement Modbus TCP communication. My setup is the following: I am trying to establish a Modbus TCP connection between a virtual PLC (CODESYS acting as Modbus TCP Client/Master) and a Siemens S7-1200 PLC acting as a Modbus TCP Server. From the Debian VM, I can successfully ping the S7-1200 and verify that port 502 is open using tools like nc. Network-wise, everything appears to be correct. However, when running the application in CODESYS, I receive messages such as “Demo mode for Modbus/TCP Master started. Will expire and stop!” and socket errors like “ClientSocket.UpdateStatus socket error 111 disconnecting.” The ClientTCP block from the ModbusFB library attempts to connect, but the connection does not remain stable. My main question is whether the CODESYS demo license explicitly limits or interrupts Modbus TCP Master communication. Is it expected that in demo mode the runtime will automatically close sockets after some time or prevent stable Modbus TCP connections? I would like to confirm whether this behavior is normal when using ModbusFB in demo mode, or if I should continue troubleshooting the configuration. Additionally, I would like clarification regarding the “fieldbus instances” mentioned in CODESYS licensing options (for example, 2, 4, or 16 instances). What exactly is considered one fieldbus instance? Does one Modbus TCP Client block count as one instance? Does each active connection to a different device count separately? Do Modbus TCP Master and Server count independently toward the total number of instances? Finally, I would appreciate clarification on any other practical limitations of demo mode when using industrial communication libraries such as ModbusFB. Are there limits on the number of connections, number of requests, or communication duration? I am trying to determine whether demo mode is sufficient for testing a virtual PLC communicating with a Siemens S7-1200 over Modbus TCP, or whether a full license is required even for this kind of validation scenario. Thank you in advance for any guidance.
Last updated: 2026-02-25

Post by user3000 on Can't find an Extended Pulse Timer (TP and LTP) ^{CODESYS Forge talk (Post)}
Hello, For my program I need an extended pulse timer, which can be referred to as a retriggerable pulse timer. Where every rising edge of the input resets the elapsed time zero, extending the lenght of the output pulse. The Codesys pulse timer (TP) is a one-shot timer and only resets the elapsed time with the falling edge of the input. There is also a pulse timer (LTP) in codesys, but in my simulation it was also functioning as a one-shot even though the description sounds like LTP should be retriggerable. I have uploaded some timing plots from another PLC program for reference. I am looking for a timer equivalent to the "TEP" diagram. Is there an Extended Pulse Timer in Codesys? Maybe there is a way to manipulate the input so it resets the elapsed time outside the function block?
Last updated: 2023-12-06

Post by karel-bas on Loosing connection to emulation running on Linux ^{CODESYS Forge talk (Post)}
Hello, I am trying to emulate my code but for some reason my Codesys IDE keeps loosing connection to the emulator. I am constantly pinging virtual machine on which its running and its running fine, but codesys refuses to reconect to it, and is not able to rediscover it. Codesys 3.5 SP20 Patch 1 I have linux installed like image in attachment.(using version 4.12) Linux VM is set up to use up to 4 cores and 8gb of ram, with nothing else runing on it. I dont have a license so I am aware that the emulation shouldnt run for more then 120 minutes I am able to, login, get sysinfo, reboot etc from codesys IDE for certain period of time (5minutes) then my connection gets lost, sometimes I can login again, but sometimes i have to reboot the VM. Any suggestions what might be the issue ?
Last updated: 2024-09-19

Post by forest on SM Drive license error ^{CODESYS Forge talk (Post)}
Hi, when it comes about license, I used INVTmatic Studio, which uses Codesys, for programming INVT plc. I bought Codesys Modbus license, it was not expensive, and then realised that INVT didn't have License Manager option (greyed out in program) which is needed for using of Codesys License. I contacted support from INVT, but developers told me that option is still not available. So depending on environment for programming Codesys, you can or not use Modbus license. Good thing about this version of Modbus TCP it works both direction. I could send commands and receive feedbacks from drive. But communication stops after 30 mins. So I used simple version of ethernet modbus which is somewhere in INVT or Condesys library (I can check tomorrow) which works only one way. I could send cmd to drive, and control it, but didn't have any feedback, like some readings back in PLC. which is bad, but at least I could start it and it didn't fail after 30 mins.
Last updated: 2024-01-10

Post by jv-certhon on Io driver Scan functionality ^{CODESYS Forge talk (Post)}
Hello, Codesys IDE is 3.5.21.30 IoDrvBase is: 3.5.17.8 I am working on implementing Codesys on our I/O product line, using the IO driver examples, and the Linux UDS socket approach. I have sucessfully created an implemetation where I have a Device with mutiple slots, on which I can plug modules. These modules represent our IO modules, and communication is successful. (For this question the assumtion can be made that Codesys commucates with 1 'master' device, which handles further communcation with the IO modules. For the next part of the question it can be assumed that the Master device has a list of which modules are attached/available) I'm now trying to implement the 'Scan for Devices...' feature, but I'm completetly lost on what to do once the IoDrvScanModules method is called in my IoDrvFB. I'm guessing that the ppConnectorList has to be filled with the found devices, but I have no idea if that is the correct approach. And Codesys is not triggering my breakpoints in the method, which makes things more difficult. I hope someone could provide some examples or guidance on what steps I should take to implement the scan feature. Thanks in advance.
Last updated: 2025-11-26

Post by eschwellinger on Editor FIND highlight color ^{CODESYS Forge talk (Post)}
To change the color of search result markings (the "find color") in the CODESYS Text Editor using Themes, follow these steps: Go to the menu: Tools → Options. In the Options dialog, select the Text editor category. Switch to the Theme tab. Here, you can select your desired color theme for the text editor. The available color schemes (themes) are stored in the installation directory in the Themes folder. To specifically adjust the color for search result markings, go to the Text Area tab within the Text editor options. Here, you can customize the Selection color – Inactive parameter, which determines the color used to highlight search results. Changing the theme will apply a new set of color settings, including those for selections and search highlights. If you want further customization, you can manually edit or create your own theme files in the Themes folder of your installation directory Example "c:\Program Files\CODESYS 3.5.21.50\CODESYS\Themes\myDefault.editortheme" https://content.helpme-codesys.com/en/CODESYS%20Development%20System/_cds_dlg_options_text_editor.html
Last updated: 2026-03-12

Post by taywinkel on Virtual Keyboard Support on Login Page ^{CODESYS Forge talk (Post)}
I am in the process of getting a visualization to work with the codesys keyboard. I created a custom keyboard which works fantastic for all input fields in the main visualization. I created a user management for my runtime, which gave me the standard blue login page. The codesys keyboard does not show up when trying to enter the usernam or password. I have tried every setting: changing the keyboard back to the standard codesys keyboard, and changing various settings on the visualization manager with no success. I can only use a physical keyboard connected to the device to enter the password. I did try removing the keyboard to no success either. I even tried creating my own login page so I could guarantee the keyboard showed up. This ended in disaster as I could not figure out the very complicated VisuUserManagement and VisuUserManagementDialog library, and documentation is contradictory or lacking. I imagine that an on screen keyboard is essential for many people's projects when using touchscreen panels, so I am wondering what others are doing. I would rather not use an external virtual keyboard (external to codesys) because this causes its own complications (I am working on a linux build with high securities).
Last updated: 2026-03-22

communication ^{CODESYS Forge talk (Thread)}
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Last updated: 2023-08-19

NETVAR_UDP ^{CODESYS Forge talk (Thread)}
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Last updated: 2023-08-29

VPN ^{CODESYS Forge talk (Thread)}
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Last updated: 2023-09-06

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