kpetro07 Posted February 6 Report Share Posted February 6 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. Quote Link to comment Share on other sites More sharing options...
MVP 2021 Joe Tauser Posted February 6 MVP 2021 Report Share Posted February 6 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. Quote Link to comment Share on other sites More sharing options...
kpetro07 Posted February 6 Author Report Share Posted February 6 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.. Quote Link to comment Share on other sites More sharing options...
MVP 2021 kratmel Posted February 6 MVP 2021 Report Share Posted February 6 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. Quote Link to comment Share on other sites More sharing options...
kpetro07 Posted February 9 Author Report Share Posted February 9 model of Siemens is SIMATIC ET200SP 6ES7512-1DK01-0Ab0 Quote Link to comment Share on other sites More sharing options...
MVP 2021 Joe Tauser Posted February 10 MVP 2021 Report Share Posted February 10 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 Quote Link to comment Share on other sites More sharing options...
MVP 2021 kratmel Posted February 10 MVP 2021 Report Share Posted February 10 17 hours ago, kpetro07 said: 6ES7512-1DK01-0Ab0 It looks like it's a Profinet PLC, so Joe's solution should probably work. Quote Link to comment Share on other sites More sharing options...
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