Modbus TCP Library Codesys 3.5

swedeleaner · Oct 23, 2017

Hello!

Is there any readily avalaible function blocks for this?!
Found heaps of Codesys 2.3 stuff, but the libraries have changed and can´t be installed in Codesys 3.5

I´m looking for Modbus TCP Client (Master) and Modbus TCP Server (Slave).

OSCAT have some FB:s for this but in codesys 2.3
Is it possible to open function blocks from libraries in Coesys 2.3?

Guess I could try to do a copy-paste with the code, but can´t open the FB:s in Codesys 2.3 (Nothing happens when i double click on them.

If someone knows where i can find FB´s developed for Codesys 3.5 i would really appreciate it.

(I´m building a Raspberry Pi Soft-PLC with Crevis-nodes for my home)

gclshortt · Oct 23, 2017

https://forum.codesys.com/viewtopic.php?t=5621

The above link may help you out.
Regards,

swedeleaner · Oct 23, 2017

Solved

OSCAT doesn´t distrubute anymore, 3S does it.

All OSCAT librarys for CodeSys 3 is now found at www.codesys.com.

(8{)} ( .) · Oct 24, 2017

If I may make a recommendation. If you're using the Raspberry PI I recommend you look into doing all of this with Node Red.

Good Luck!

Yosi
(8{)}

.)

swedeleaner · Oct 25, 2017

Naaah..

Just got it working. All native Codesys 3.5 functions!

BOLI · Mar 22, 2018

Hi swedeleaner,
How did you solved this with Codesys native functions?
I was able do do this with ModbusServer FB (ModbusTCP slave lib) but I did not find anything for Client?

swedeleaner · Mar 22, 2018

It wasn’t that obvious.

You assign the Network adapter as a Modbus Client if I’m not misstaken. I could email my project to you, send me your e-mail as a message!

BOLI · Mar 23, 2018

swedeleaner, I have send you a private message with my mail adress.

IT_Marco_93 · Oct 5, 2021

I know it's an old thread but... the issue is still alive for many

I managed to make a Modbus RTU client via the ModbusRequest2 FB inside the IoDrvModbus library, it's pretty straightforward:
- you open the com port
- execute the request passing the port handle to the FB

Now I'm trying to make a Modbus TCP client without doing it via the Device, because it pretty much sucks.

I found the ModbusRequest inside the IoDrvModbusTCP and understood I have to use ModbusTCPSlave to connect to the slave/server before handling the request. Still, I'm not able to understand how to connect to the slave.

If any of you managed to do it and could give me some hints, that would be great. Thanks

AustralIan · Oct 5, 2021

Use SP17 and the library ModbusFB

IT_Marco_93 · Oct 5, 2021

Unfortunately I am stuck at SP12 due to the PLC manufacturer using that runtime

kallileo · Oct 6, 2021

Please check the following link. You need to establish connection first using IoDrvModbusTCPSlave.
I have used this library once on SoMachine. I created a state machine with IoDrvModbusTCPSlave being in the first step and then I would use ModbusRequest to execute various Modbus commands in the following steps or something like that.

https://product-help.schneider-elec...guration_editor/modules/_mod_f_libraries.html

IT_Marco_93 · Oct 7, 2021

@kallileo are you sure about that?
I think 'IoDrvModbusTCPSlave' is for creating a Modbus TCP Slave (server) on your device.

Maybe you meant 'ModbusTCPSlave': in fact I created the instance but I have no idea how to start the connection...

following you link: https://product-help.schneider-elec..._modbustcpslave_function_block_modbustcpslave
it tels that you start it wiht the property 'xEnable', which doesn't exist.
I used the method 'UpdateCommunicationSettings' to set the ip and port, and now...? I attached a picture to show both my instance and the instance created in the device tree

I really appreciate your help

kallileo · Oct 7, 2021

You setup communication settings for the Modbus slave in the device tree as you show.

Then it seems that you only need to setup some ModbusRequest function blocks to read/write registers.

IT_Marco_93 · Oct 7, 2021

the ModbusRequest FB works if I use the POINTER TO ModbusTCPSlave in my device tree, because it is connected.

But I cannot use the ModbusRequest FB with my ModbusTCPSlave created locally, because the connection state is OFF even if I configured the ip and port, because there seems to be no method to start the connection

Modbus TCP Library Codesys 3.5

swedeleaner

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(8{)} ( .)

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