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Overview Section 6-3
reception, data is received to the send/receive data addresses set in the
parameter area.
6-3-3 Using Socket Services with CMND(490)
Service request commands can be sent to the Ethernet Unit by executing the
CMND(490) instruction in the ladder diagram. CS/CJ Ethernet Units support
the same functionality as the CVM1/CV-series Ethernet Unit, so heritage
programs can be easily corrected and reused.
Up to 16 sockets can be connected using CMND(490): 8 UDP sockets and
8 TCP sockets.
The socket service request commands that can be used are listed in the
following table. Refer to Section 7 FINS Commands Addressed to Ethernet
Units in the Operation Manual, Construction of Networks for details.
Requests sent to the Ethernet Unit by sending commands through execution
of CMND(40), and when the Unit receives a command, it will return a
response. The response does not, however, indicate that processing has
been completed, and the status of the flags in the Socket Status Words
allocated to the Unit must be used to determine when processing has been
completed.
The results of processing will be stored in the words specified when
CMND(490) was executed once the requested processing has been
completed.
6-3-4 Specific Socket Service Functions
The socket service functions listed in the following table can be executed
either using Socket Service Request Switches or using CMND(490).
Command code Name
MRC SRC
27 01 UDP OPEN REQUEST
02 UDP RECEIVE REQUEST
03 UDP SEND REQUEST
04 UDP CLOSE REQUEST
10 TCP PASSIVE OPEN REQUEST
11 TCP ACTIVE OPEN REQUEST
12 TCP RECEIVE REQUEST
13 TCP SEND REQUEST
14 TCP CLOSE REQUEST
Protocol Socket service request
UDP Open UDP socket
Receive via UDP socket
Send via UDP socket
Close UDP socket
TCP Open TCP socket, passive
Open TCP socket, active
Receive via TCP socket
Send via TCP socket
Close TCP socket