Siemens S7 1200 MODBUS TCP/IP READ WRITE DATA by MB_CLIENT -Part 02

[@farhatahmed6332]

Thank you it's working 🥰

[@therealtimeautomationandio756]

you welcome

[@adnansheikmytheen7549]

really genious

[@nelsongaymerortiz9813]

Hi, when you put tcon_ip_v4 in connect of the module db client, this not function , the text stay in red (" mb configuration". "read CONNECT "), is this problem version of the PLC (v.22) S71200.????

[@therealtimeautomationandio756]

Can you please elaborate

[@inesmartinez9964]

Hello, I am following the video to establish Modbus TCP/IP communication between my PLC and a controller (which will be my server) using the MB_Client function in TIA. I need to read and write. However, I am not able to figure out why it is not working. Is there a specific way of assigning the ID for each block of MB_Client (why do you choose 10 and 20, is it random?)? When you define within the Instance DB the MB_Unit_ID to 1, should it always be like this? I am not able to figure out whether I am missing something. Thank you in advance!

[@therealtimeautomationandio756]

Id for each block is randomly. And MB_Unit_ID will be 1,2,3..... 255 (depends on how many device you used).

[@inesmartinez9964]

Thank you very much for your response. And so if I want to Read and Write the same registers for one single server, therefore the MB_Unit_ID should be 1 in both cases. At the moment I am able to read and write separately, but, not when I use the 2 blocks for read/write at the same time. For some reason, both MB_Client blocks remain ´Busy´.

[@makotokarlsefni8906]

@@inesmartinez9964 Have you tried using opposite clocks for each block, one clock normally open and another clock normally closed?

[@beckenbauer1974]

i have 2 modbus client one is read and one is write. it only work one at a time. if there is one running another one will be in error despite i have different address, please advice

[@makotokarlsefni8906]

Use opposite clocks for each block, one clock normally open and another clock normally closed