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Read more than one float data via Modbus RTU using S7-1200

 
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diode
Junior
Junior


Joined: 21 Jul 2012
Posts: 2
PostPosted: 04/04/2016 12:08    Post subject: Read more than one float data via Modbus RTU using S7-1200 Reply with quote
Dear all

I'm a new in S7 1200. I have

1 x 1214C CPU
2 x CM1241 RS422/485

The fisrt S7-1200 act as Modbus RTU master to read float data from Modbus RTU salve (i'm using Modbus poll to act as slave). In Master block i try to read one float from slave and save to MD50->everything is ok.
Read more than one float data via Modbus RTU using S7-1200 Read more than one float data via Modbus RTU using S7-1200
But when I want to read more float data from a salve and save to DB. I only received 0 value althought i change value from salve
Read more than one float data via Modbus RTU using S7-1200 Read more than one float data via Modbus RTU using S7-1200
Please help me resolve this problem
Best regards!
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grig100
Member 3
Member 3
grig100

Joined: 01 Jan 2015
Posts: 752
PostPosted: 04/04/2016 20:24    Post subject: Reply with quote
If is not secret put the project on a link.
You are testing with real PLC or with PLCSIM?
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