ET200SP - Modbus RTU with 20 Slaves

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LKMNVRS
Posts: 8
Joined: Sun Nov 08, 2015 7:48 pm

ET200SP - Modbus RTU with 20 Slaves

Post by LKMNVRS » Fri Jan 13, 2017 4:05 pm

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

OR

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

capsute
Posts: 49
Joined: Wed Sep 12, 2007 2:44 am
Location: China

Re: ET200SP - Modbus RTU with 20 Slaves

Post by capsute » Fri Feb 17, 2017 1:32 pm

same db,different device ID.

SHKODRAN
Posts: 197
Joined: Wed Dec 24, 2008 4:37 pm
Location: Europe
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Re: ET200SP - Modbus RTU with 20 Slaves

Post by SHKODRAN » Sat Apr 08, 2017 5:37 pm

Hello everybody.

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

Thanks in advance.

Regards.

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