Modbus tcp/ip master/slave simulation problem

[kabouras_33]

Last note for today!!
I used modbus poll software in various situations and i works perfect until now so i think that if we manage to communicate flowcode slave with modbus poll we are done
I stop now because brain salad.
Goodnight!!!

[kabouras_33]

Hello!!!
Further update today i tried a flowcode master with simulation slave....the simulation could read coils correctly but not holding registers....
Well by now i dont know if i am helping or i am in completly the wrong direction...
Awaiting your feedback
Thanks again!!!

[kabouras_33]

hello again,
i think that the check for incoming macro doesnt give correct responce...
i keep searching awaiting your feedback

[Benj]

Hello,

I'll see if I can replicate this problem for you and hopefully provide a fix.

[kabouras_33]

Dear Benj,
Hello!! So after some time, i could make the esp8266 work
The solution is tricky to explain but it looks like flow code components target the wrong index to retrieve or send data to other except flow code,
I wrote my own software in unity 3d and I could locate the problem.
No, the problem is with the w5500 which still I cannot understand why it doesn't work!! (a very simple example would be awesome!!!)
and secondly
I noticed in the slave Modbus TCP there is a macro GetLastIncoming.....
I believe I can retrieve specific info with that macro from the incoming message...
Well, I want to retrieve the address number from the incoming message (index 2) but I have no idea how???
any pointers?

[kabouras_33]

Cannot make it work!
esp8266 works very good but w5500 just refuse to connect....am i missing something?
A little help please??

[kabouras_33]

No go...i tried as Modbus TCP slave enc28j60,w5500,w5100 all of them no go
I can ping them but they do not appear on my routers or work of course...
ok, I am waiting for your kind assistance because at least the w5500 which says supported should work but no so I am doing something wrong definitely.

[Benj]

Thanks for letting us know of the problem, the W5500 should certainly be working so let me investigate this for you.

[kabouras_33]

Thank you Benj,
and if you need anything from me, test,or send you data please tell me!
i will be most happy if i can be of any assistance

[TaliG]

Dear Benj,

I am stuck with the same problem.

I am using Codesys with rasberryPi as a Master, EB091 plus W5500 as a slave.

ModbusTCP with W5500 gives invalid header response.

UART Modbus RTU works great.

Any news on a fix?

Thanks!

rpiRTU.fcfx works great
rpiTCP.fcfx connects but returns wrong response values.

[kabouras_33]

Hi,almost a year now...any updates???on the bug...

[Benj]

Hello,

A few months ago I looked into this and provided a fix for the TCP modbus components to fix the header. Please check you are using the latest updates using help -> Check for updates.

Here was the topic where we investigated the problem.
https://www.matrixtsl.com/mmforums/view ... 56#p101856

If you are using the latest files then let me know and I'll have another look into it.

[kabouras_33]

Ooo i lost that!!!!
Awesome!!!!i am planning to incorporate it in another system so thats great timing!!!!
Thanks you are the best once again!!!

[TaliG]

Hi kabouras!

Modbus TCP protocol replies are already fixed by Benj.

At least w5500 works fine for me (communicates correctly with modbus poll).

Please take a look at this thread https://www.matrixtsl.com/mmforums/view ... 78&t=22101 and download my test flowchart using w5500 that works great with modbuss poll. (last post).

About esp, I have not tested anything yet, I am waiting some new boards with esp-07s to start play with.

but on the above topic Benj corrected everything about the protocol and the w5500 can communicate correctly with modbus poll.

George