
Using Socket Services with CMND(490) | Section |
6-8-9 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 communications.
For the UDP connection, the Ethernet Unit uses a PASSIVE OPEN and the host computer uses an ACTIVE OPEN.
System Configuration
The system configuration for the program example and the Ethernet Unit system setup are shown below.
Host computer
Ethernet Unit
PLC
IP address: | 196.36.32.55 | IP address: | 196.36.32.101 |
Port number: | 4096 | Port number: | 4096 |
|
| FINS network address: | 01 Hex |
|
| Node address: | 01 Hex |
|
| Unit number: | 10 Hex |
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
CMND(490) response codes
Response codes in results storage area
Network Communications Error Flags (A21900 to A21907)
Completion codes (A203 to A210)