Using Socket Services with CMND(490) | Section |
Programming Example
000000
000000 000200 A20200
000000 000200 A20200 150100 150114
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D01020
#0000
A21900
000000 000200 A20200 150100
000001
000001 000201 A20200
000001 | 000201 | A20200 | 150103 | 150114 | ||||||||||
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D01050
#0000
A21900
000001 000201 A20200 150103
Continued on next page.
@RSET
000100
@SET
000200
CMND(490)
D01000
D01010
D00000
RSET
000200
SET
000100
RSET
000000
@RSET
000101
@SET
000201
CMND(490)
D01030
D01040
D00010
RSET
000201
SET
000101
RSET
000001
UDP Passive 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.
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.
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.
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.
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.
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.
