Mitsubishi Electric MELSEC-L Series - Communication Structure

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10.2 Communication Structure
When a connected device sends a message to an E71 in the SLMP message format, the E71 performs the process
according to the message. During communications, a CPU module including the E71 operates as a server, and the
connected device (a personal computer or other terminals) operates as a client. Based on the request message
received from the client, the server (the E71) automatically sends an appropriate response message.
Connected device
Ethernet
E71
Server
Client
Header Command
Access
destination
Request message
Subheader
Header Response dataSubheader
Response message