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Socket Services Section 2-3
There is no need to execute the CMND(490) instruction or to monitor the com-
pletion timing and actual processing of the instruction, so this helps to simplify
ladder programming.
A total of eight ports (UDP and TCP combined) can be used for socket ser-
vices.
By Executing CMND(490) The other way to use socket services is to request a UDP or TCP socket ser-
vice by sending a FINS command to the Ethernet Unit by executing
CMND(490) from the CPU Unit. When the Ethernet Unit receives the socket
service request, it returns a response to the CPU Unit to confirm that it
received the request and then begins the requested processing. When the
processing is completed, the results are stored in the Results Storage Area in
the CPU Unit.
Eight TCP ports and eight UDP ports can be used.
UNIX computer, etc.
(node with socket services interface)
Ethernet
TCP/UDP protocol
CS/CJ-series
CPU Unit
Ethernet Unit
TCP/UDP
protocol
CS/CJ-series
CPU Unit
Parameters
Ethernet Unit
Socket Service Request Switches
Socket
UNIX computer, etc.
(node with socket
services interface)
Ethernet
TCP/UDP protocol
CS/CJ-series
CPU Unit
Ethernet Unit
UDP protocol
CS/CJ-series
CPU Unit
Ethernet Unit
TCP protocol
FINS command
FINS response
Processing results
Socket interface
Results Storage Area
Socket