CANOpen issue. Beckhoff 6751 CANOpen Master with Codesys TTC590 as slave ^{CODESYS Forge talk (Thread)}
CANOpen issue. Beckhoff 6751 CANOpen Master with Codesys TTC590 as slave
Last updated: 2020-12-18

CANopne Manager doesn't wait for slave boot-up after reset during startup ^{CODESYS Forge talk (Thread)}
CANopne Manager doesn't wait for slave boot-up after reset during startup
Last updated: 2021-04-09

PROFINET master slave communication between raspberry pi and windows pc PLC ^{CODESYS Forge talk (Thread)}
PROFINET master slave communication between raspberry pi and windows pc PLC
Last updated: 2018-04-20

CANopen slave crashes on "Start Remote Node" command from master, SYNC related ^{CODESYS Forge talk (Thread)}
CANopen slave crashes on "Start Remote Node" command from master, SYNC related
Last updated: 2022-07-08

Post by reinier-geers on Gear on is slave offline ^{CODESYS Forge talk (Post)}
When i Put Gear on, the the slave goes off.. Why ? Disable Gear_on and Reinit the drive its back
Last updated: 2024-01-14

Post by felipemsgarcia on Generic EtherCAT slave ^{CODESYS Forge talk (Post)}
Hello, I'd like to know if it's possible to add a servo drive as a generic EtherCAT slave (non-Motion). Thank you in advance!
Last updated: 2024-05-14

Post by simover on TCP/IP client ^{CODESYS Forge talk (Post)}
THANK YOU
Last updated: 2023-12-20

Post by timvh on ernesto881124 ^{CODESYS Forge talk (Post)}
You will need a USB to RS485 converter to connect the PC to the Modbus RTU Slave Device. In Windows this converter will be recognized as Serial COM poort (e.g. COM2, or COM3, see the windows device manager to find this out). Select this port in your CODESYS application. On the PC you need to use the CODESYS Control Win (SoftPLC) to run your application. It will not work in simulation mode, because then the Modbus Communication will not be activated.
Last updated: 2023-09-14

Post by nano on Issues with Modbus Slave with Raspberry Pi ^{CODESYS Forge talk (Post)}
in the codesyscontrol.cfg or codesyscontrol_user.cfg you have to declare whoch comport-ports from runtime are used. please tell us how the comport is called in linux an post the codesyscontrol.cfg files also write down here, which parameters are used in the python-script and what is parameteized in the modbus-master-comport of your codesys-application. mostly the errors occurs in ine of these areas
Last updated: 2024-07-11

Post by yannickasselin on Dynamically enabling/disabling Modbus slave devices in runtime (performance issue with timeouts) ^{CODESYS Forge talk (Post)}
I would definitely try using the "Reconfigure" function block from "CAA Device Diagnosis@ library. https://content.helpme-codesys.com/en/libs/CAA%20Device%20Diagnosis/3.5.17.0/CAA-Device-Diagnosis/Function-Blocks/Reconfigure/Reconfigure.html#:~:text=This%20function%20block%20reads%20and,take%20effect. Although I have not tried it with Modbus, I had great success with EtherNet/IP, Profinet and EtherCAT. You can also have a look at the other functions in this library. There are useful functions to help iterate through all the nodes under a master node.
Last updated: 2025-08-12

Post by ofey on EtherCAT fieldbus ^{CODESYS Forge talk (Post)}
Okey, thank you! Do you think it is something in this library, that makes it possible to do the configuration in a PRG? https://content.helpme-codesys.com/en/libs/IODrvEtherCATDriver/Current/IoDrvEtherCAT.html#id1 I think the codesys modbus libraries support configuration and connection to modbus slaves without having to add the slave devices in the device tree. Just do it from function blocks inside the program. I was hoping for something similar with EtherCAT.
Last updated: 2024-04-10

Post by rmaas on TCP Server ^{CODESYS Forge talk (Post)}
Hi George, I am no expert but recently tried and got it working using this example project: https://forge.codesys.com/prj/codesys-example/nbs/home/Home/#example-for-tcp-server-tcp-client BR, Rinie
Last updated: 2025-02-20

Post by pr0schwein on Driving the slave axis across master's zero point - caming ^{CODESYS Forge talk (Post)}
Is there a way to move the slave axis across the zero point of the master axis with variable start and stop points? For example: Slave start at 270° and end at 50°. thanks :)
Last updated: 2024-01-18

Post by gatto on Modbus tcp - channel ^{CODESYS Forge talk (Post)}
Hi can you give more details? Are you talking about a danfoss? wich model? Can post the configuration of channel' I used, on the past, serial modbus with danfoss fc280 I remember ((id x 10)-1) I remember that you couldn't use continuous reading/writing of the directors but you had to use them one at a time. it seemed that reading empty registers (caused by x10) was not accepted by danfoss. So I had created a scan that used just one register, then the next etc etc with a timed interval. But this was for the serial, I don't know if it's the same thing with ethernet. I currently use Ethernet TCP/IP interface with FC280.
Last updated: 2024-06-13

Post by xiaolo on Raspberry Pi 5 ^{CODESYS Forge talk (Post)}
Does Ver. 4.12 support Raspberry Pi 5? I have three issues. The first issue is that Codesys cannot detect the RPI 5 when I want to download the runtime. When assigning the IP Address manually then I can download the runtime. The second issue is that I cannot connect to the RPI to download a program. Sometimes the window pops up and it ask for the user credentials, but it is still not connecting. The third issue is that I cannot connect to an ESP32 configured as a Modbus Slave with a Raspberry Pi 4B. I can connect to the ESP32 via a Radzio! Modbus Master Simulator. I am also missing the function Write Holding Registers in the setup of the slave. Are this known issues and when it will be solved?
Last updated: 2024-07-12

Post by eoahe on Problem Reading Registers via Modbus from non Codesys device ^{CODESYS Forge talk (Post)}
Hey Guys :) I have the following Problem using Modbus via Codesys: I'm trying to implement a Modbus Device into my codesys project. The device is a Router from Teltonika (RUT956) and it can communicate via Modbus. Currently I'm trying to implement it into my codesys prject as a slave and I'm using my windows computer as master. As it is not a codesys device (the codesys application is not uploaded to device as it has its own software) I'm having problems requesting and reading registers from the router. I've set up my windows computer as Master and implemented the router as slave. When I go online on my master device it sais that it has established a connection to the slave (router)(So I'm thinking this could work as there is a connection?). The goal is to read the GPS (latitude and longitude) data and on the homepage of teltonika you can find the register address and number of registers (adress 143 for latitude and 145 for longitude; both have a number of two registers). I've found tutorials how to read specific registers via their register address with other modbus programs (like modbus-cli), but as my entire project is established in codesys I was hoping to read these specific registers via codesys so that I can show the GPS data on my dashboard. I've tried establishing slave channels but that hasn't been working. I tried read input register channels of the length 4 but it's not possible to define specific register addresses to read via codesys so that didn't work (I jsut get a slaves device failure) and I've also tried establishing 516 (total number of registers the router sends I think?) read inputregister channels but that has the samle failure... So i guess the problem I'm having is establishing slave channels to read these specific registers. Does anyone know how to tackle this problem and has maybe had the same problem? Or maybe someone knows a workaround? I'm quite new to codesys so maybe I'm also lacking expertise...
Last updated: 2025-03-01

Post by rh-pk on v3.5 SP19 - Modbus TCP Devices - Channel Limit? ^{CODESYS Forge talk (Post)}
Hello jacobwago, I believe that the limit is fixed in the editor, but not in the driver package. There seems to be no link between the driver setting and the editor. Otherwise, I don't know why the input (>10) is blocked, but the function is available. Unfortunately, I cannot offer you any other solution apart from the one mentioned above. Kind regards
Last updated: 2024-09-30

Post by rd76065 on Opto 22 Groov PR2 Modbus TCP Master communication ^{CODESYS Forge talk (Post)}
Previously, I have used ModbusEthernet_04 library for Wago for ModbusTCP Master communicational in Codesys V2.3. How to use same communication of similar UDT for Opto22 Groov PR2 PLC in Codesys V3.5 SP20. Can I use OSCAT library - Network -MB_Client or IODrvModbusTCP - ModbusRequest for this requirement? If any other please guide.
Last updated: 2024-05-31

Post by fmon on Modbus : dis- / re-connect cable: modbus does not re-start ^{CODESYS Forge talk (Post)}
Hello, I am using codesys Modbus TCP client (4.4.0.0) to communicate with a python modbus server (package pyModbusTCP). I first start my python server on the distant machine. After a fresh codesys compilation, a plc connection/transfer and a PLC run, the modbus connection is OK. Every time in this context the connection is created correctly. When I shut down the server, the modbus connection falls, that is normal. When I restart the python server, impossible to recreate the modbus connexion. With the client autoreconnection, I see on my server that the client tries to connect but unsuccesfully. I have the following message : DEBUG:pyModbusTCP.server:accept new connection from ClientInfo(address='192.168.1.20', port=33476) DEBUG:pyModbusTCP.server:Exception during request handling: NetworkError('recv return null') I tried to stop the codesys client and to restart it with these commands : Modbus_TCP_Client.xStop := True; // Or False Modbus_TCP_Client.Enable := True; // Or False Modbus_TCP_Server.Enable := True; // Or False I tried to confirm the error manually to force reconnection with: Modbus_TCP_Server_Motors.xConfirmError := TRUE; I tried also this command to STOP/RESET/START client and server (codesys side) but nothing happens : status_client := Modbus_TCP_Client.SetCommunicationState(eRequestedState := DED.DEVICE_TRANSITION_STATE.STOP); // .RESET & .START The answer of this function when executed is "status_client = NOT_SUPPORTED" It seems that is a socket problem, but I do not understand if it is on the client or server side. I tried a modbus simulator called "ananas.exe" and the result is the same. Impossible to get a modbus reconnection. What is different at the first connection and at a reconnection attempt ? Thanks for your help
Last updated: 2025-03-14

Global variable access by Programms and Modbus Devices (attach device to bus) ^{CODESYS Forge talk (Thread)}
Global variable access by Programms and Modbus Devices (attach device to bus)
Last updated: 2024-07-18

Timeout Error in Modbus Communication with WAGO PFC200 and iEM2050 Meter using 750-652 Module ^{CODESYS Forge talk (Thread)}
Timeout Error in Modbus Communication with WAGO PFC200 and iEM2050 Meter using 750-652 Module
Last updated: 2024-07-30

Connecting to SoftPLC Only Works By Turning Off Modbus Ethernet Port ^{CODESYS Forge talk (Thread)}
Connecting to SoftPLC Only Works By Turning Off Modbus Ethernet Port
Last updated: 2024-08-08

OPTO22 Groov Epic PR2 Modbus Comms Dropping out every 2 hours and 4 Mins ^{CODESYS Forge talk (Thread)}
OPTO22 Groov Epic PR2 Modbus Comms Dropping out every 2 hours and 4 Mins
Last updated: 2024-09-11

Post by kislov on CODESYS Modbus 4.4.0.0 - Modbus network redundancy ^{CODESYS Forge talk (Post)}
Solved. Enable this feature by editing C:\ProgramData\CODESYS\Devices\89\0000 0005\4.4.0.0\device.xml (config params 9105 and 9106).
Last updated: 2024-10-08

Modbus: Is there a way to get the channel index from the channel name? ^{CODESYS Forge talk (Thread)}
Modbus: Is there a way to get the channel index from the channel name?
Last updated: 2024-10-21

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