We have a PLC (Festo CPX) and robot, and we are trying to establish Modbus TCP between the two. Looking at the documentations for these, it appears that both of them can only function as slaves (servers). Is it possible to establish a server to server communication in this case?

 

Hello,

No.

One device must send a communication and the other device responds. The two you defined only respond to communications.

Good luck,

Mark
http://www.peakhmi.com/

 

No, It is not possible to have a server to sever communication, instead it is a client to server communication where client send a request and server respond back. You can have one master which communicates with both PLC and robot.

Santosh Kubasad
Modbus Protocol Engineer
Colways Solutions (http://www.colwaysolutions.com)

 

If the devices are indeed servers only, then no. You would need a client in there somewhere that initiates transfers between the servers.

Darrin

 

Hi,

To get two Modbus TCP/IP Server's to communincate you need two Modbus TCP/IP Modbus Client connections, www.fieldserver.com can do this, give their office in CA a call and they will assist.

Regards,
Richard