Hello msmirzazadeh;

What documents do you have stating that the Masibus 85xx supports Modbus TCP?

This thread has been running for a long time, always showng problems connecting through Modbus TCP, but I can find no documenttion on the subject from the manufacturer.

Basic communication with external devices on the Masibus 85xx is listed as Modbus RTU (on RS 485), optionnally Profibus-DP (wich probably means an additional module on the DAQ unit). When discussing TCP/IP connections, the only protocol mentionned is Modnet, over TCP/IP. Nowhere can I find a mention of Modbus TCP.

https://www.masibus.com/downloads/manuals/85XX+_Quick_user_guide.pdf

If you want to use an RJ45 link with the Masibus 85xx, I suggest you look for the explanation of the Modnet protocol, which you will have to implement yourself in your PLC. Masibus does not seem to discuss it on their website, maybe you could contact their support team.

If Modbus is you choice, you will need to use Modbus RTU, over an RS 485 connection. Your S7-1200 or S7-1500 CPU has integrated Modbus RTU instructions, MB_COM_LOAD and MB_Master, explained in detail in the onluine help of Step 7, or in the multiple discussions on this forum (search for them using the search box at the right of this page).

Hope this helps,

Daniel Chartier

 Hello,

amolmule

i am also same issue, your issue resolves.

If it is resolves , please tell me how to resolve this issue.

 and what issue you have?

 Hello,

amolmule

i have the same problem like you. i can not read the calue from masiibus85xx with modbus tcp in tia portal 

 no, I don't have any problem, something wrong with you here. If you read all posts in this Topic from first, you have many good advices what you need to do and what is required probably to know about functionality. So question is again, what problem you have exactly? What you did with cfg on device and also on your PLC? You can easy do screenshots and ZIP them so we can check your steps and maybe then better help you. At this time with your requests, not possible to help.