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6-3
Section
Using Socket Services with CMND(490)
137
Programming Example
If the Port Enabled Flag (A20200) turns ON and the Clos-
ing Flag (CIO 150103) turns OFF while the UDP Closing
Flag (CIO 000201) is OFF, checks are made and if any of
the following are true, the UDP Close Error Flag (CIO
000101) is turned ON.
The Results Storage Error Flag (CIO 150114) is ON.
The contents of the Response Storage Area set in the
command code (D01050) is not 0000 Hex (normal end).
The Network Communications Error Flag (A21900) is ON.
After the execution results have been checked, the UDP
Close Bit (CIO 000001) is turned OFF.
When the UDP Closing Flag (CIO 000201) turns ON, the
status of the Port Enabled Flag (A20200) is checked to
be sure it is ON and a UDP CLOSE REQUEST command
is sent using CMND(490).
D01030: First command word
D01040: First response word
D00010: First control data word
The UDP Closing Flag (CIO 000201) is also turned OFF.
UDP Close
When the UDP Close Bit (CIO 000001) turns ON, the
UDP Close Error Flag (CIO 000101) is turned OFF and
the UDP Closing Flag (CIO 000201) is turned ON to ini-
tialize processing.
If the Port Enabled Flag (A20200) turns ON and the Open-
ing Flag (CIO 150100) turns OFF while the UDP Opening
Flag (CIO 000200) is OFF, checks are made and if any of
the following are true, the UDP Open Error Flag (CIO
000100) is turned ON.
The Results Storage Error Flag (CIO 150114) is ON.
The contents of the Response Storage Area set in the
command code (D01020) is not 0000 Hex (normal end).
The Network Communications Error Flag (A21900) is ON.
After the execution results have been checked, the UDP
Open Bit (CIO 000000) is turned OFF.
When the UDP Opening Flag (CIO 000200) turns ON,
the status of the Port Enabled Flag (A20200) is checked
to be sure it is ON and a UDP OPEN REQUEST com-
mand is sent using CMND(490).
D01000: First command word
D01010: First response word
D00000: First control data word
The UDP Opening Flag (CIO 000200) is also turned
OFF.
UDP Open
When the UDP Open Bit (CIO 000000) turns ON, the
UDP Open Error Flag (CIO 000100) is turned OFF and
the UDP Opening Flag (CIO 000200) is turned ON to
initialize processing.
Continued on next page.
000200
CMND(490)
D01000
D01010
D00000
@RSET
000100
000000
@SET
000200
000000
000200
A20200
RSET
000200
SET
000100
000000
A020200
150100
150114
<>(305)
D01020
#0000
A021900
000200
RSET
000000
000000
A020200 150100
000201
CMND(490)
D01030
D01040
D00010
@RSET
000101
000001
@SET
000201
000001
000201
A20200
RSET
000201
SET
000101
000001
A020200 150103
150114
<>(305)
D01050
#0000
A021900
000201
RSET
000001
000001
A020200 150103