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Thursday, March 30, 2017
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Siemens to GE Fanuc PLC Communication with Modbus RTU
Connecting a Siemens S7-300 PLC to fetch data from GE Fanuc Micro PLC through Modbus RTU.

I need to connect by Siemens S7-300 PLC (CPU315-2 DP) to fetch data from GE Fanuc VersaMax Micro PLC (IC200UDD110) through Modbus RTU. But i have no idea how to do it.

Please help.

Thank You
dheerendar@live.com

1 out of 1 members thought this post was helpful...

Hello Dheerendar,

Below are links from another groups that hope can be your starting point :

https://support.industry.siemens.com/tf/WW/en/posts/rs-485-communication-with-s7-300/88822?page=0&pageSize=10

http://www.plctalk.net/qanda/showthread.php?t=86205

Please learn them first and back with more specific question if any,
hope these helps

Best regards
Ikhtiander

Hello Dheerendar,

A starting point is to decide if the GE Fanuc VersaMax Micro PLC is acting as Modbus RTU master or Slave. There are Siemens solutions for Modbus RTU, but I would suggest using a gateway as it is more cost effective.

As the S7-300 is normally a Profibus master, you will need:
https://www.anybus.com/products/gateway-index/anybus-communicator/detail/anybus-communicator---profibus
If the GE Fanuc VersaMax Micro PLC is acting as Modbus RTU Slave.

And you will need:
https://www.anybus.com/products/gateway-index/anybus-xgateway/detail/anybus-x-gateway-profibus-slave-modbus-rtu-slave
If the GE Fanuc VersaMax Micro PLC is acting as Modbus RTU master.

My 2 cents

Patrick L