kpetro07 Posted February 6, 2023 Report Share Posted February 6, 2023 Hello, I am trying to read from Siemens PLC. Is it possible through Modbus ? Because in Siemens the communication is Profibus.. Is it the same ? Also the address in Siemens is not integer.. Is it possible to communicate ? Thank you. Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted February 6, 2023 MVP 2023 Report Share Posted February 6, 2023 Maybe, if the particular Siemens you're using supports the Modbus protocol on a separate RS232 or RS485 serial port. That's a question for your Siemens dealer. The only thing Profibus and Modbus have in common is they both end in "bus". Someone else on the forum can describe it much better than I. I just know it as "the purple cable". Google is your friend- https://control.com/forums/threads/difference-between-modbus-and-profibus.31231/#:~:text=Profibus has certain protocol features,not the same as Profibus). Joe T. Link to comment Share on other sites More sharing options...
kpetro07 Posted February 6, 2023 Author Report Share Posted February 6, 2023 7 minutes ago, Joe Tauser said: Maybe, if the particular Siemens you're using supports the Modbus protocol on a separate RS232 or RS485 serial port. That's a question for your Siemens dealer. The only thing Profibus and Modbus have in common is they both end in "bus". Someone else on the forum can describe it much better than I. I just know it as "the purple cable". Google is your friend- https://control.com/forums/threads/difference-between-modbus-and-profibus.31231/#:~:text=Profibus has certain protocol features,not the same as Profibus). Joe T. I think this is what I am looking for, but link is not wokring.. Link to comment Share on other sites More sharing options...
MVP 2023 kratmel Posted February 6, 2023 MVP 2023 Report Share Posted February 6, 2023 18 minutes ago, kpetro07 said: trying to read from Siemens PLC Model # or Siemens product code needed... If Profibus on board https://www.moxa.com/en/spotlight/protocol-gateways/modbus-to-profinet-profibus/index However, many user manuals and forums need to be studied in order to achieve what you want. Link to comment Share on other sites More sharing options...
kpetro07 Posted February 9, 2023 Author Report Share Posted February 9, 2023 model of Siemens is SIMATIC ET200SP 6ES7512-1DK01-0Ab0 Link to comment Share on other sites More sharing options...
MVP 2023 Joe Tauser Posted February 10, 2023 MVP 2023 Report Share Posted February 10, 2023 Looks like Modbus TCP is built in as a function block - https://support.industry.siemens.com/cs/document/102020340/how-do-you-program-and-parameterize-modbus-tcp-communication-between-s7-1500-cpus-and-s7-1200-cpus-?dti=0&lc=en-WW This note talks about communicating between two Siemens PLCs via the Ethernet (sorry, PROFINET) port but it should work with any Modbus TCP device. Joe T. 1 Link to comment Share on other sites More sharing options...
MVP 2023 kratmel Posted February 10, 2023 MVP 2023 Report Share Posted February 10, 2023 17 hours ago, kpetro07 said: 6ES7512-1DK01-0Ab0 It looks like it's a Profinet PLC, so Joe's solution should probably work. Link to comment Share on other sites More sharing options...
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