Post by atcprojectteam on Modbus Function Code 15, writing multiple coils ^{CODESYS Forge talk (Post)}
Hi all, I am using an RSTI-EP I/O card along with the EPXMBE101 Modbus/TCP network adapter. I have a Control Standard L license. I successfully connected to the I/O card via Modbus and can read inputs without any issues. However, when I try to write to the digital output modules using function code 15, I am unable to make any changes. Here’s what I have done so far: I created a small project using Structured Text. I set up Modbus channels (as shown in the attached image) and mapped the pins. When I use cyclic mode, the connection results in an error. However, when I use the rising edge, the connection works, but I don’t see any changes on the I/O card. For the output module, I assigned one bit to high. After that, I ran CODESYS Control Win V3. (Should I be running the PLC as well?) I built the program, but I am not receiving any response from the I/O card. Could you please advise on what might be causing this issue?
Last updated: 2025-02-26

Post by atcprojectteam on Modbus Function Code 15, writing multiple coils ^{CODESYS Forge talk (Post)}
Hi all, I am using an RSTI-EP I/O card along with the EPXMBE101 Modbus/TCP network adapter. I have a Control Standard L license. I successfully connected to the I/O card via Modbus and can read inputs without any issues. However, when I try to write to the digital output modules using function code 15, I am unable to make any changes. Here’s what I have done so far: I created a small project using Structured Text. I set up Modbus channels (as shown in the attached image) and mapped the pins. When I use cyclic mode, the connection results in an error. However, when I use the rising edge, the connection works, but I don’t see any changes on the I/O card. For the output module, I assigned one bit to high. After that, I ran CODESYS Control Win V3. (Should I be running the PLC as well?) I built the program, but I am not receiving any response from the I/O card. Could you please advise on what might be causing this issue?
Last updated: 2025-02-26

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 bjarne-pagaard on OPC UA Server Status on Win RTE ^{CODESYS Forge talk (Post)}
Hi there, An "OPC Expert" client software is connecting to a Codesys Control RTE (x64) OPC UA Server. It reads only about 25 variables every 5 minutes. The OPC UA Server seems to shut down on the Codesys runtime. Is there any way to get information about the Codesys OPC UA Server status? Restart it? There is nothing in the PLC Logs after the OPC UA Server has started. It works for a while, then it doesn't. Any ideas? Any way of getting more info out of the Codesys OPC UA Server? -Bjarne
Last updated: 2024-10-21

Post by schorge on Modbus RTU Slave ^{CODESYS Forge talk (Post)}
Ich würde gerne bestimmt Modbus RTU Slave Adressen auslesen, leider bekomme ich keine Werte vom Bus. Verbindung erfolgt über einen Raspberry mit Modbus RS485 Adapter, welcher erfolgreich verbunden ist. Mit einem IOBroker kann ich die Daten erfolgreich auslesen. In der Modbus_COM_Port => Modbus_Serial_Device habe ich Input Register 4000 %QW und Startadressen auf Input Register 3000, als Variable ein Array[0..2999] of Word, kann aber keine Werte auslesen.
Last updated: 2023-12-06

Post by dengsberg on Disable Communications to 'Modbus_Server_COM_Port' from the logic ^{CODESYS Forge talk (Post)}
I have a serial Modbus RTU communicating to the Slave device. But when the control system is not in Run there is no power applied to one of the Modbus Devices. Can I enable / disable the communications to that Modbus Slave in the code based on my running mode, so I don't get all the errors?
Last updated: 2024-08-29

Post by hassaank on CODESYS V3+ WAGO PFC200+ MODBUS RTU ^{CODESYS Forge talk (Post)}
Hi everyone, I’m new to CODESYS and Wago devices, and I’m trying to set up Modbus RTU communication. I have a Wago PFC200 (8110) and a 750-653 RS485 module, and I want to read data from an energy meter using Modbus RTU. Thanks in advance for your help!
Last updated: 2025-03-17

Post by hinet on 22kW Wallbox mit Modbus ^{CODESYS Forge talk (Post)}
Hallo an alle, ich schaue mir gerade ein paar 22kW Wallboxen an: https://shop.einfacheauto.de/collections/22-kw-wallboxen Mir wäre vor allem wichtig, dass die Kommunikation per Modbus gut funktioniert. Es werden zwar ein paar Wallboxen gelistet, die Modbus ermöglichen, trotzdem wollte ich euch nach Erfahrungen fragen, welche Modelle in der Hinsicht besonders problemfrei funktionieren.
Last updated: 2025-11-06

Post by spiritcore on Server not adding PLC ^{CODESYS Forge talk (Post)}
I added new Gateway and I can see it connected. When I scan the server for PLC, it finds the PLC but when I click the Add To Server button, it shows "PLC was added." in the status. But I can't find the PLC in the list. I tried removing the gateway and re-configure everything again but it didn't solve. Any ideas?
Last updated: 2025-02-17

Post by timvh on Accessing ModbusTCP addresses from python ^{CODESYS Forge talk (Post)}
https://en.wikipedia.org/wiki/Modbus
Last updated: 2023-09-20

Post by ahuckphin on Issues with Modbus Slave with Raspberry Pi ^{CODESYS Forge talk (Post)}
duplicate
Last updated: 2024-07-11

Post by dohy on Modbus RTU Response CRC fail ^{CODESYS Forge talk (Post)}
Did you resolve it?
Last updated: 2024-09-19

Post by dkugler on STRING size and reading STRING with Modbus ^{CODESYS Forge talk (Post)}
Last updated: 2025-01-31

Post by sandro66 on Application-based license Modbus Channels ^{CODESYS Forge talk (Post)}
Hi Gatto, Using version 3.5.21.xx, it is no longer possible to use Modbus function blocks (I make extensive use of these FBs.)as shown in the example. https://content.helpme-codesys.com/en/CODESYS%20Examples/_ex_modbus_example.html The compiler detects one Modbus instance for each instance of the communication FB block. The example program above, although simple, reports 8 Modbus instances when compiled with the latest version. Codesys Support says that you must use fieldbus I/O mapping, but this will result in the loss of the ability to programmatically modify communication parameters. Sandro
Last updated: 2025-09-04

Post by eschwellinger on IoDrvModbusTCP_Diag not defined when using MODBUS ^{CODESYS Forge talk (Post)}
known issue hopefully solved to next version
Last updated: 2024-04-18

Post by tobifenny on Modbus TLS Kommunikation ^{CODESYS Forge talk (Post)}
Ich habe eine Wallbox, die ich gerne per Modbus ansteuern würde. Die Normale Modbus-Kommunikation, um ein paar Werte auszulesen klappt auch. Wenn ich aber Zugriff auf bestimmte Modbus-Register haben möchte, benötigt die Wallbox ein TLS-Zertifikat. Das Zertifikat habe ich bereits erstellt und im Security-Sreen unter Eigene Zertifikate hochgeladen. Weiter komme ich aber nicht mehr. Wie baue ich eine TLS-Verbindung mit der Waalbox auf? Vielleicht hat das ja schonmal jemand gemacht und ein Beispiel für mich. Ich bin über jede Hilfe sehr Dankbar!
Last updated: 2025-11-05

Post by garrian on How to write multiple coils (Modbus FC15) ^{CODESYS Forge talk (Post)}
Thanks! As far as I can see, the client can only send words. And on the server side there are an array for each of the functions: bool for coil and discrete, word for holding and input registers. I assume I can use holding register, then use bit mapping on the words instead of coils. But I really want to use the FC15/coils.
Last updated: 2024-11-17

Post by davidbo on RPI is license server down ^{CODESYS Forge talk (Post)}
It was but is running again
Last updated: 2023-10-19

Post by eschwellinger on User management ^{CODESYS Forge talk (Post)}
CODESYS Automation Server could do this too..
Last updated: 2024-09-04

Post by egau on OPC UA C# client connecting to OPC UA CODESYS server ^{CODESYS Forge talk (Post)}
any updates on this?
Last updated: 2024-09-18

Post by dogulas on OPC UA C# client connecting to OPC UA CODESYS server ^{CODESYS Forge talk (Post)}
sadly, no
Last updated: 2024-09-19

Post by eschwellinger on OPC UA Server Status on Win RTE ^{CODESYS Forge talk (Post)}
latest version of the Control RTE?
Last updated: 2024-10-21

Post by eschwellinger on Automation server - trends stop recording - need to manually reconnect ^{CODESYS Forge talk (Post)}
latest Edge should solve it
Last updated: 2024-11-20

Post by winki on Opaque NodeId in the OPC UA server ^{CODESYS Forge talk (Post)}
Hello, I have the same Issue !!!
Last updated: 2025-01-27

Post by eschwellinger on Exception when OPCUA datasource disconnects from Server ^{CODESYS Forge talk (Post)}
Which runtime version and which communication addon version?
Last updated: 2025-03-21

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