Chapter 7 Socket Communication Function - Mitsubishi Electric FX5 User Manual

7
SOCKET COMMUNICATION FUNCTION
The socket communication function allows data communication with the devices on Ethernet by TCP or UDP using various
dedicated instructions.
Program
*1 The area is used for storing data received from the connected open devices.
• For dedicated instructions used for the socket communication function, refer to Page 83 Socket
Communication Function Instructions.
• Access through routers is also available. When configuring the settings set the subnet mask pattern and
default gateway IP address. (Page 29 Communication via Router)
Port numbers
In socket communication, port numbers are used to identify respective communication and thereby multiple communications
are available both on TCP and UDP.
• For sending: Specify the port number of the CPU module from which data is sent, and the port number of the destination
device.
• For receiving: Specify the port number of the CPU module, and read the data sent to the port.
CPU module
(IP address: xx.xx.xx.xx)
Port
number A
Port
number B
Port
number C
Sending data
SP.SOCSND instruction
Socket communication
receive area
Connection No. 1
Connection No. 2
Connection No. 3
SP.SOCRCV instruction
Reading receive data
Connection No. 8
Ethernet
Sending UDP data from the port number A
of CPU module to the port number L of the
communication target device 1
Sending UDP data from the port number L
of the communication target device 1 to the
number L
port number A of CPU module
Sending data via TCP connection
Sending data via TCP connection
number M
Sending UDP data from the port number C
of CPU module to the port number N of the
communication target device 3
Sending UDP data from the port number N
of the communication target device 3 to the
number N
port number C of CPU module
*1
Receiving data
to
Communication target device 1
(IP address: yy.yy.yy.yy)
Port
Communication target device 2
(IP address: zz.zz.zz.zz)
Port
Communication target device 3
(IP address: ww.ww.ww.ww)
Port
7 SOCKET COMMUNICATION FUNCTION
External device
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