Tips and sample program for MODBUS TCP

Rich jackson

Hi Exper!

I am a new member, i am very like these tip b/c i can be learned from it.

Thanks so much!

But, for this link of tip have been fault, so i hope you to up a new tip.

Hi Pegaia,

i have downloaded the sample program 'modbus tcp'. but i can't use it. 

i think the cause is the firmware. (1212c DC/DC/DC FW:4.0 with tia portal v13)

can you edit the sample for this config, i have tried it. but i don't understand 'connect' of the mb_server block.

thanks you in advance.

AIA

Hi Denilson,

First of all, thank you for an excellent example.

How would I go ahead and delete the 1200 Slave and replace it with an 3rd party device? 

Thanks!

Hi Denilson, I have some questions about the modbus tcp in s7-1200

Actually, Im using Modbus RTu in the S7-1200 with a module for the modbus RTU, but I need to use Modbus TCP. I want to know if I need more hardware to implement that. I steel need the module for Modbus or I can use the Modbus TCP only with the s7-1200?

Thanks regards

Hello,

I am using a 1214C as a modbus TCP client device. And a third party modbus server must be able to read from and to write to my PLC. I have  a couple of questions about implementing it.

1.Do i need two MB_CLIENT blocks to enable both write and read. Like MB_MODE=0 in one block and MB_MODE=1 in another (to be able to both read and write values in my holding registers)

2.If i must use two MB_CLIENT blocks do i need to use the DISCONNECT input if i get DONE=True. Like when first block is for reading holding register values and the second one is for writing values to my PLC.  Like when i but REQ=1 in the first block and then i get DONE=True. Do i have to make DISCONNECT=True in the first block and then go to the write block and do the exact same procedure.

Thank You in advance,

Martin Mölder

Hello,

               Thanks a lot for ur Sample Program . Very Useful Inforamtion

Best Regards,

Arasan..

Nevermind,

I'm sorry.