I am new to modbus protocol of Siemens. I really need help from the experts.

Scenario:  I have 10units of RS485 power meter and it is needed to communicate to SCADA Wincc 7.4

Questions:

1) Is it possible to communicate directly to SCADA? How? :(

2) Is there any additional software or hardware needed to make the integration work? 

Thank you so much 

Regards,

Jhing

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Split from Wincc Flexible connect to SLC 5/03 Via DF1 and RS485.

Hello jhing;

The last version of WinCC that supported serial channels (for Modbus RTU) qwas version 5, if I remember well.

For more modern versions, you have a few choices:

- connecting your Modbus RTU slaves to a PLC acting as a Modbus RTU master, and linking this PLC to WinCC, using an available communication channel. This can easily be done with a small S7-1200 CPU, for example.

- purchasing an external Modbus channel license for WinCC, from Allmendinger. This allows you to connect a number of Modbus RTU slaves directly to your WinCC PC.

https://www.allmendinger.de/Produkte/WinCCKommunikation/MODBUSProtocolsChannelforWinCC/tabid/1874/language/de-DE/Default.aspx

- using the integrated WinCC OPC channel to connect to an OPC server reading and writing data to your modbus RTU sloaves. You must then search for and purchase a Modbus RTU server that can connect to your slaves.

WinCC v7,4 SP1 - Communications:

https://support.industry.siemens.com/cs/ww/en/view/109746339

Hope this helps,

Daniel Chartier