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Using Socket Services with CMND(490) Section 6-8
Note When using the above programming example, change the bit and word
addresses as necessary to avoid using the same areas used by other parts of
the user program or the CPU Bus Unit.
When the UDP Receiving Flag (CIO 000203) turns ON, the
status of the Port Enabled Flag (A20200) is checked to be
sure it is ON and a UDP RECEIVE REQUEST command is
sent using CMND(490).
D04000: First command word
D04010: First response word
D00030: First control data word
The UDP Receiving Flag (CIO 000203) is also turned OFF.
UDP Receive
When the UDP Receive Bit (CIO 000003) turns ON, the
UDP Receive Error Flag (CIO 000103) is turned OFF
and the UDP Receiving Flag (CIO 000203) is turned ON
to initialize processing.
When the UDP Sending Flag (CIO 000202) turns ON, the
status of the Port Enabled Flag (A20200) is checked to be
sure it is ON and a UDP SEND REQUEST command is
sent using CMND(490).
D02000: First command word
D03000: First response word
D00020: First control data word
The UDP Sending Flag (CIO 000202) is also turned OFF.
UDP Send
When the UDP Send Bit (CIO 000002) turns ON, the UDP
Send Error Flag (CIO 000102) is turned OFF and the
UDP Sending Flag (CIO 000202) is turned ON to initialize
processing.
If the Port Enabled Flag (A20200) turns ON and the
Sending Flag (CIO 150102) turns OFF while the UDP
Sending Flag (CIO 000202) is OFF, checks are made and
if any of the following are true, the UDP Send Error Flag
(CIO 000102) is turned ON.
The Results Storage Error Flag (CIO 150114) is ON.
The contents of the Response Storage Area set in the
command code (D03010) is not 0000 Hex (normal end).
The Network Communications Error Flag (A21900) is ON.
After the execution results have been checked, the UDP
Send Bit (CIO 000002) is turned OFF.
If the Port Enabled Flag (A20200) turns ON and the Re-
ceiving Flag (CIO 150101) turns OFF while the UDP Re-
ceiving Flag (CIO 000203) is OFF, checks are made and if
any of the following are true, the UDP Receive Error Flag
(CIO 000103) is turned ON.
The Results Storage Error Flag (CIO 150114) is ON.
The contents of the Response Storage Area set in the com-
mand code (D04020) is not 0000 Hex (normal end).
The Network Communications Error Flag (A21900) is ON.
After the execution results have been checked, the UDP
Receive Bit (CIO 000003) is turned OFF.
Continued from previous page.
000202
CMND(490)
@RSET
000002
@SET
000002 000202 A20200
RSET
SET
000002 A20200 150102 150114
<>(305)
A21900
000202
RSET
000002 A20200 150102
000203
CMND(490)
@RSET
000003
@SET
000003 000203 A20200
RSET
SET
000003 A20200 150101 150114
<>(305)
A21900
000203
RSET
000003 A20200 150101
END(001)
000102
000202
D02000
D03000
D00020
000202
000102
D03010
#0000
000002
000103
000203
D04000
D04010
D00030
000203
000103
D04020
#0000
000003