Using Socket Services with CMND(490) | Section |
Continued from previous page. |
| ||||
000002 |
|
|
|
|
|
|
|
|
|
| @RSET |
|
|
|
|
| 000102 |
|
|
|
|
| @SET |
|
|
|
|
| 000202 |
000002 | 000202 | A20200 |
| ||
|
|
|
|
| CMND(490) |
|
|
|
|
| D02000 |
|
|
|
|
| D03000 |
|
|
|
|
| D00020 |
|
|
|
|
| RSET |
|
|
|
|
| 000202 |
000002 | 000202 |
| A20200 | 150102 | 150114 |
|
|
|
|
| SET |
|
|
|
|
| 000102 |
|
|
|
|
| <>(305) |
|
|
|
|
| D03010 |
|
|
|
|
| #0000 |
|
|
|
|
| A21900 |
000002 | 000202 | A20200 | 150102 |
| |
|
|
|
|
| RSET |
|
|
|
|
| 000002 |
000003 |
|
|
|
|
|
|
|
|
|
| @RSET |
|
|
|
|
| 000103 |
|
|
|
|
| @SET |
|
|
|
|
| 000203 |
000003 | 000203 | A20200 |
| ||
|
|
|
|
| CMND(490) |
|
|
|
|
| D04000 |
|
|
|
|
| D04010 |
|
|
|
|
| D00030 |
|
|
|
|
| RSET |
|
|
|
|
| 000203 |
000003 | 000203 |
| A20200 | 150101 | 150114 |
|
|
|
|
| SET |
|
|
|
|
| 000103 |
|
|
|
|
| <>(305) |
|
|
|
|
| D04020 |
|
|
|
|
| #0000 |
|
|
|
|
| A21900 |
000003 000203 | A20200 | 150101 |
| ||
|
|
|
|
| RSET |
|
|
|
|
| 000003 |
|
|
|
|
| END(001) |
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.
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.
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.
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 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.
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.
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.
