Specifications

1 - 11
1.4 MELSEC-Q Ethernet Module
1.4.1 Role of Ethernet module
The Ethernet module supports the data communications between external devices and
a PLC CPU or between PLC CPUs on Ethernet, and sends/receives data to/from a
target device with the TCP/IP or UDP/IP communication.
In consequence, the PLC CPU status can be checked from an external device located
far from the PLC CPU.
Factory B
PLC
Ethernet
module
External device
Router
Factory A
External device
External device
Ethernet
module
PLC
PLC
Ethernet
module
All the external devices can communicate with PLCs in factories A and B via Ethernet.
Also, the PLCs in factories A and B can communicate with each other.