2. Preparing for commissioning
2-10
Festo CPX-FB36-EN en 1611a English
2.2 Modbus® TCP protocol
Modbus® is an open communication protocol based on the
master-slave architecture. It is a standard for communication
via TCP/IP in automation technology.
The Modbus® TCP protocol is activated with DIL switch 1.2 in
the ON position (è Tab. 1/2).
The bus node is then identified with the designation
“FB36-MB - Modbus® TCP Remote-IO”.
After switching the protocol, the following unmodified para
meters are available:
– IP address
– Diagnostics mode
– System parameters
The DIL switch function remains unchanged.
Retentive bus-specific parameters are only active if the relev
ant protocol is selected (è section 1.2.4).
The configuration options via Modbus® TCP correspond to
those via EtherNet/IP.
Exception: EtherNet/IP objects cannot be accessed via Mod
bus® TCP.
In order to configure the CPX terminal for Modbus® TCP, the
Modbus® addresses of the data and of the inputs and out
puts of the CPX terminal are required. (è D).
Addressing examples can be found in the appendix (è D.6.1).
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