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Connect to a Schneider Electric Quantum plc through Modbus Tcp/ip

Hello,

 

I am trying to use modbus tcp/ip to send data (start stop signals) over to a Schneider Electric Quantum Plc running Unity Pro Software. I am new to this area of communcation, and have both downloaded and tried to use modbus TCP/IP with the DSC module. however, I didnt get any communcation and I was thinking maybe using OPC Servers might work. Has anyone done something similar or have any suggestions? and if OPC will work, can you provide some steps or details on how to implement this communication. 

 

Thanks,

 

Joaquin

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One thing to check is whether you are using the correct version of the modbus protocol. There is an ascii version that transfers data as human-readable strings and an RTU version that sends the data as binary.

 

Mike... 


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Hi,

 

Thanks for your reply. I am not using serial communication. I actually need it to connect through TCP/IP. Both ASCII and RTU communication are for Modbus Serial communication. 

 

 

Joaquin

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Yes, but if its expecting one and gets the other it won't communicate.

 

Mike... 


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Yes, but if its expecting one and gets the other it won't communicate.

 

Mike... 


Certified Professional Instructor
Certified LabVIEW Architect
LabVIEW Champion

"... after all, He's not a tame lion..."

For help with grief and grieving.
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If I understood correctly from this paper

 

http://www.ni.com/white-paper/7675/en/ 

 

Serial communication will be the one that will use RTU or ASCII

 

TCP/IP communication is different all on its own.

 

 

Regards,

 

Joaquin

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the way modbus over TCP/IP works is that it uses the same protocol but with the TCP/IP connection carrying the data rather than rs232 or rs485.

 

Mike...

 

PS: ethernet is serial communications too...


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"... after all, He's not a tame lion..."

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