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Using Socket Services with CMND(490)
Section 6-3
6-3
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 CV-series Ethernet Unit, so heritage programs
can be easily corrected and reused.
CMND(490) instruction in the ladder diagram. CS/CJ Ethernet Units support
the same functionality as the 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.
8 TCP sockets.
The socket service request commands that can be used are listed in the fol-
lowing table. Refer to Section 11 FINS Commands Addressed to Ethernet
Units for details on these commands.
lowing table. Refer to Section 11 FINS Commands Addressed to Ethernet
Units for details on these commands.
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 allo-
cated to the Unit must be used to determine when processing has been com-
pleted.
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 allo-
cated to the Unit must be used to determine when processing has been com-
pleted.
The results of processing will be stored in the words specified when
CMND(490) was executed once the requested processing has been com-
pleted.
CMND(490) was executed once the requested processing has been com-
pleted.
Basic FINS Command
Format
Format
The basic format for FINS commands used for socket services is shown in the
following diagram.
following diagram.
Command Code:
Specifies the process code requested from the socket.
Socket Number
Specifies the socket number for the process, between 1 and 8.
Results Storage Area
Specifies the area to store the results of the requested process.
Parameters
Specifies the parameters defined for the command code.
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
Socket
number
number
0
1
2
3
4
5
6
7
8
9
10
11
12
Command
code
code
Results storage area
Parameters
Byte order from
the beginning of
the frame
the beginning of
the frame