Post by nulltrace on How change Unity-ID in TCP Modbus Slave ^{CODESYS Forge talk (Post)}
Hey, I also waiting for feedback from Mr. Schwellinger @eschwellinger, please send me an answer, i would appreciate it. The clue is, i know the solution, but have to check if it's allowed to share.
Last updated: 2026-04-14

Post by husarz17 on How change Unity-ID in TCP Modbus Slave ^{CODESYS Forge talk (Post)}
Good to know there's a solution to this problem. I hope you'll be able to share it with me. I can't wait to hear about it.
Last updated: 7 days ago

Post by timvh on Modbus TCP & RTU with Control for Linux SL ^{CODESYS Forge talk (Post)}
RS485 doesn't seem very logical to use in VPLC's in my opinion. I also don't know if this is supported.... But for TCP/IP, I think you still need to configure the Nic settings. See the attached png. In my case enp6s0. When changing this setting, restart the VPLC. What is really nice, is that you don't have to configure the IP address setting in Linux. By setting the Nic to a certain IP address in the CODESYS instance configuration, this is automatically done for you. I only tested this with EtherCAT, but I guess this works the same for Modbus TCP/IP.
Last updated: 2024-10-23

Post by ofey on Modbus TCP communication ^{CODESYS Forge talk (Post)}
Hi! I tried setting up the PLC I'm working with (Beijer GN-9373) to connect to a modbus master running on a laptop. I have an ethernet connection (via USB-C to ethernet) between the laptop and the controller. I have tried following tutorial on how to set this up. I have added an ethernet device with the IP-address of the PLC. Further I added a ModbusTCP_Slave_Device with default settings. I get the error "Failed to open TCP Port: 1" when I try to go online with the PLC. Earlier I tested the exact same set up with the soft PLC from codesys. I can then read/write values correctly with the Modbus master i have running on the laptop. Hope anybody can help me with this, thanks in advance!
Last updated: 2023-10-06

Post by jens on Modbus tcp - channel ^{CODESYS Forge talk (Post)}
Help wanted This is the first time i'm doing a Modbus Tcp project. I have some VLT with a extension module MCA-122. i'm currently unable to write to the VLT slave, but i can read from status word parameter=1603 and address := 16029 where the address is calculated from parameter is ((id x 10)-1). in the manual the functions that are supported are 3 hex, 6 hex, 10 hex, b hex and 11 hex. read holdin registers, write single register, write multiple registers, get comm. event counter, report slave id. i'm only using the Modbus Slave Channel is this wrong when trying to write to the vlt ?
Last updated: 2024-06-13

Post by kislov on CODESYS Modbus 4.4.0.0 - Modbus network redundancy ^{CODESYS Forge talk (Post)}
Hi. There is next information in CODESYS Modbus 4.4.0.0 Release Notes: "Modbus network redundancy" How to use this feature? As I understand, new fields in STUCT ModbusTCPComSettings are associated with it, but more detailed information is needed.
Last updated: 2024-10-07

Post by hanpekel on Reading request counter value from modbus server in application ^{CODESYS Forge talk (Post)}
Any way I can read the value of the 'request counter' (see screenshot) in my application. Amount of client connections is easily found using ModbusTCP_Slave_Device.uiClientConnections; But for request counter it does not seem to be that simple.
Last updated: 2024-10-16

OPC UA Client unable to connect to CeDeSys OPC UA Server but able to connect to other OPC UA Server ^{CODESYS Forge talk (Thread)}
OPC UA Client unable to connect to CeDeSys OPC UA Server but able to connect to other OPC UA Server
Last updated: 2018-10-30

Post by jeroenaero on Difference between using OPCUA symbol configuration and OPCUA Server object ^{CODESYS Forge talk (Post)}
Hi, What is exactly the difference between using symbol configuration as OPCUA server or using the Codesys object OPCUA server? What are the advantages and disadvantages of using symbol configuration and OPCUA server object. Please let me know
Last updated: 2025-10-30

Post by fmon on Modbus : dis- / re-connect cable: modbus does not re-start ^{CODESYS Forge talk (Post)}
Problem solved The client modbus cycle time was linked to a task at 500ms. Whereas the channel modbus was at 200ms. Certainly problem of packages synchronisation. I let the client modbus cycle time to be handled by itself (See attachement) --> "Use the bus cyle time parameters" (traduce from french) See attachement
Last updated: 2025-03-18

Post by rh-pk on v3.5 SP19 - Modbus TCP Devices - Channel Limit? ^{CODESYS Forge talk (Post)}
Hi, i found a solution for me. I had installed a 'old' version of CoDeSys (3.5.18 P5). I tried to add channels there, which works fine. I created a new project, added an Ethernet-Port, added a Modbus-Master and then I copied the ModBus-Slave from my working project to the new project. Now I could add more channels. I add the channels 10 and 11. Then I deleted (please make a backup before :-) the original ModBus-Slave in my working project and copied the extended Slave back to my working project. Surprisingly it is now possible to add new channels. Maybe this will help you.
Last updated: 2024-02-14

Post by egr99 on Modbus TCP Server connection is ESTABLISHED but all holding registers are value 0? ^{CODESYS Forge talk (Post)}
You're absolutely right. Sorry for that. In the meantime I wrote a Function block to handle the reads and writes to the different attached RTU-devices. It processes the parameter like (str_Modbus:=(usiSlave:=1, uiFC:=5, uiLEN:=1, uiOFFSET:=0, uiInterval:=500)) and the corresponding output, waits for the response and processes next request in a 5-state procedure. It's working for 2 gateways (stable without errors, although error recovery is included). But nevertheless it should be possible with the Channel definitions of Codesys. Much easier to maintain :)
Last updated: 2026-04-08

What the right way to update TCP/COM slave device holding registers ^{CODESYS Forge talk (Thread)}
What the right way to update TCP/COM slave device holding registers
Last updated: 2024-07-01

Post by sinameshksar on TCP Socket Client ^{CODESYS Forge talk (Post)}
Hello I'm looking for a TCP socket client project example. Can you assist?
Last updated: 2024-09-11

How can i program a TCP/IP communication on softlinkARM? ^{CODESYS Forge talk (Thread)}
How can i program a TCP/IP communication on softlinkARM?
Last updated: 2011-06-28

Yellow triangle and bus not running error in Modbsu TCP master and Slave. ^{CODESYS Forge talk (Thread)}
Yellow triangle and bus not running error in Modbsu TCP master and Slave.
Last updated: 2021-12-07

Yellow triangle and bus not running error in Modbsu TCP master and Slave. ^{CODESYS Forge talk (Thread)}
Yellow triangle and bus not running error in Modbsu TCP master and Slave.
Last updated: 2021-12-07

can I send data over udp/tcp in simulation mode? ^{CODESYS Forge talk (Thread)}
can I send data over udp/tcp in simulation mode?
Last updated: 2016-06-05

CAA net base TCP client cause PLC to crash - Kernel message : N0HZ_local_softirq_pending 80 ^{CODESYS Forge talk (Thread)}
CAA net base TCP client cause PLC to crash - Kernel message : N0HZ_local_softirq_pending 80
Last updated: 2024-01-12

Post by simover on TCP/IP client ^{CODESYS Forge talk (Post)}
I want to send a string to a tics TCP/IP server. I got i working with the Net Base lib. for communication good with this tcis i need to by array of byte I want to include a string in the third position of the array TCIS_Send[1] :=254; //this valus is fix for evry communication TCIS_Send[2] :=80; //this valus is fix for evry communication TCIS_Send[3] := ; here I put my and my string is lik this 5806509-DRAP10#AB#3452302073 TCIS_Send[4] :=252; //this valus is fix for evry communication
Last updated: 2023-12-18

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

Post by nehaltrivedi96 on Modbus connection via Qronox PCD3 M6893 ^{CODESYS Forge talk (Post)}
Hello, I am currently scaling 4-20mA signals and the scaled output (temperature) has to be sent via modbus protocol to a tool like doctor modbus or modbus poll. I have defined my inputs as real as and the output is also real, but to send this output via modbus it has to be of word. So how will i convert real into word and then send the generated output via modbus?
Last updated: 2026-02-18

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 husarz17 on How change Unity-ID in TCP Modbus Slave ^{CODESYS Forge talk (Post)}
My codesys is 3.5.21.30. I am using function ModbusServer from library ModbusTCP_Slave. The reason is that I need share 9000 Holding registers. By standard configuration it is only 4096. fbMbTcpDevice: ModbusTCP_Slave.ModbusServer; fbMbTcpDevice( wPort := 502, pInputData := ADR(awInputReg), pOutputData := ADR(awHoldingReg), uiInputDataSize := 10, uiOutputDataSize := 9000, xEnable := TRUE, tTimeout := 10000, InterfaceName := "eth0", xBusy => xBusy, xError => xError, byClientConnections => byConnections ); Ethernet port is cofigured: Network interface: eth0 IP address: 10.10.22.55 Subnet maskL 255.255.255.0 Default gateway: 0.0.0.0 And it only works when I am reading registers with ID 255 by Modbus Poll. Any other IDs don't work. The actual TCP client device try to read registers with ID 1 and I can't change it... Thanks in advance for your help!
Last updated: 2026-04-01

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

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