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S7 300 PN/DP CPU and 20 remote MODBUS RTU devices

10/21/2012 5:54 PM	Rate (0)
daad Silver Member Joined: 10/31/2011 Last visit: 11/26/2024 Posts: 400 Rating: (5)	Dear Sir, I have S7 300 PN/DP CPU and 20 remote MODBUS RTU devices.Is it work well with this configuration.And how we address them(data exchange,address). As well as where we find MODBUS connection settings in Step7. Regards
	Last edited by: O_Moderator at: 10/22/2012 11:57 AM new subject after splitting from /tf/WW/en/Posts/69527#top
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10/22/2012 2:54 PM	Rate (0)
Rated X Posts: 1547 Rating: (129)	Hello Shoaib Khatana, I'm not really sure, how your configuration is. Do you use the PN interface of the CPU to communicate with a converter/gateway to which the serial slaves are connected? Or have you got a CP341 with Modbus master driver? Which addressing you are looking for? Adressing of the nodes or addressing of registers/coils?
Rated X Posts: 1547 Rating: (129)
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10/22/2012 3:45 PM	Rate (0)
daad Silver Member Joined: 10/31/2011 Last visit: 11/26/2024 Posts: 400 Rating: (5)	Dear Sir, I want to use profinet port. Looking for further proceding. Regards

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10/22/2012 4:22 PM	Rate (0)
Rated X Posts: 1547 Rating: (129)	Hello Shoaib Khatana, well, it is not possible to connect serial Modbus RTU devices directly to a PN-CPU. You need a converter from serial to Ethernet and you have to decide which protocol you are going to use on the ethernet side.
Rated X Posts: 1547 Rating: (129)
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10/22/2012 4:52 PM	Rate (0)
daad Silver Member Joined: 10/31/2011 Last visit: 11/26/2024 Posts: 400 Rating: (5)	Dear sir, If i move to WINCC SCADA or WINCC flexible so is there any any OPC server which available free. Regards

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