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PostPosted: Fri Jan 13, 2017 7:05 pm 

Joined: Sun Nov 08, 2015 10:48 pm
Posts: 8
Hello Forum,

I am having S7-400H Connecting with ET200SP through Ethernet & 1 Modbus Communication Module (6ES7137-6AA00-0BA0).

I am having 20 devices of 3rd party as slaves, which I need to communicate with them through Modbus RTU - RS-484 - 2 Wire mode.

I had only 1 clarification, all the devices I connect are of same baud rate & same communication settings. So, I will use 1 - Modbus Comn Load (FB640) & 20 Modbus Master blocks (FB641).

For every, Modbus master block, there will be an DB generated & that DB need to be linked Modbus Comm Load (MB_DB) parameter. So, for other 19 DB, where i need to connect to MB_DB


I have to call 1 Modbus Cmn Load & 1 Modbus master as an set of 20.

please help...! (sos) (oo) (h)

If any sample program for communicating with Multi request...Please provide

PostPosted: Fri Feb 17, 2017 4:32 pm 

Joined: Wed Sep 12, 2007 5:44 am
Posts: 34
Location: China
same db,different device ID.

PostPosted: Sat Apr 08, 2017 8:37 pm 

Joined: Wed Dec 24, 2008 7:37 pm
Posts: 92
Location: Europe
Hello everybody.

I have neeed too the library modbus rtu , can someone share ?

Thanks in advance.


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