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Modbus Client IEC 61499 write data at server [message #1766232] Mon, 19 June 2017 05:02 Go to next message
Marcelo Garcia is currently offline Marcelo GarciaFriend
Messages: 4
Registered: December 2016
Junior Member
Hello

I need to write data at coils or registers at PLC S7-1200 using MODBUS TCP protocol. But reading MODBUS Help on IEC-61499, I don't see codes to write data. ¿Is posible write data at server using libmodbus?. ¿Which code use libmodbus to write data?

I apreciate your help

Re: Modbus Client IEC 61499 write data at server [message #1766282 is a reply to message #1766232] Mon, 19 June 2017 20:23 Go to previous message
Alois Zoitl is currently offline Alois ZoitlFriend
Messages: 454
Registered: January 2014
Senior Member
Hi,

I had a look on the code for the Modbus TCP client. As it looks you don't need to specify codes. The client uses the write registers method for sending data. I haven't tried this layer myself so you may need to test a bit which parameters give you the best results.
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