153
Using Socket Services with CMND(490) Section 6-3
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.
6-3-6 UDP/IP Communications Programming Example
The following programming example illustrates transferring 100 bytes of data
between an Ethernet Unit and a host computer using UDP/IP communica-
tions.
System Configuration
The system configuration for the program example and the Ethernet Unit sys-
tem setup are shown below.
Basic Operations
• CIO 000000 is turned ON to request opening a UDP socket from the
Ethernet Unit.
• CIO 000001 is turned ON to request closing the UDP socket from the
Ethernet Unit.
• CIO 000002 is turned ON to request sending data from the Ethernet Unit.
Data (100 bytes) is sent beginning at D02008.
• CIO 000003 is turned ON to request receiving data from the Ethernet
Unit. The data that is received (100 bytes) is stored beginning at D04025.
• One of the bits between CIO 000100 and CIO 000103 will turn ON if an
error occurs. Refer to 6-2-2 Response Codes for information on errors.
The following areas can be used to access details about errors:
CMND(490) response codes
Response codes in results storage area
Network Communications Error Flags (A21900 to A21907)
Completion codes (A203 to A210)
Host computer
Ethernet Unit
IP address: 196.36.32.55
Port number: 4096
IP address: 196.36.32.101
Port number: 4096
FINS network address: 01 Hex
Node address: 01 Hex
Unit number: 10 Hex
PC
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