hi matek1990PL,

have you seen this FAQ?:

Which hardware and software components do you need to establish communication between SIMATIC S7 stations and third-party devices using the MODBUS RTU protocol?

hope this helps,

regards,

mopS04

hi matek1990PL,

have you seen this FAQ?:

Which hardware and software components do you need to establish communication between SIMATIC S7 stations and third-party devices using the MODBUS RTU protocol?

hope this helps,

regards,

 Yes, I saw. Thanks for response.

Kaulquappe

Sample program MODBUS Master (standard block) zXX21_04_PtP_Com_MODMA.zip for STEP 7 (TIA Portal)

 Thank you for link. In this example CP-341 RS232C is used. In my hardware configuration I recently use CP-341 RS422/485. Is there something like manual to this project? It would help in order to utilize for our goal.