LS Industrial Systems XGB Series - Modbus TCP Client

Chapter 7 P2P Service
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7.4 Modbus TCP Client
7.4.1 Modbus TCP Client
Modbus TCP client provides a data read/write function sending request frame to server using function code by Modbus
TCP/IP protocol. It sends a frame when the operation condition of each block is ON.
Client
Time
①
SYN
Time
②
SYN ACK
③
ACK
PUSH ACK
⑤
PUSH ACK
⑥
ACK
⑦
FIN ACK
⑧
ACK
⑨
RST
Server
Transmission port : n >1024
Destination port: 502
Connection
Disconnection
Connection
Disconnection
Modnus TCP/IP
(Client)
Modbus TCP/IP
(Serer)
Transmission port : n >1024
Destination port :502
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[Fig. 7-17] Setting TCP XGT client channel