Omron SYSMAC CP Series, User Manual

Page: 380 / 578

15 Ethernet
15-50
CP2E CPU Unit Software User’s Manual(W614)
TCP Socket Close Request
Note These response codes will be returned only on large, multilevel networks.
For details, refer to SECTION 6 Socket Services in the Ethernet Unit s Con s truction of Application s
Operation Manual (Cat. No. W421) .
The following programming example illustrates transferring 100 bytes of databetween an Ethernet Unit
and a host computer using TCP/IP communications.
z
System Configuration
The programming example uses the following system configuration. For the TCP connection, the
Ethernet Unit uses a passive open and the host computer uses an active open.
z
Data Flow
The data will flow between the CPU Unit, Ethernet Unit, and host computer as shown in the following
diagram.
Note Here, “execution bits” refer to W0.00 to W0.0 3 , which are used in the ladder diagram to con-
trol execution of communications.
Responsecode Meaning
0000 Normal end
0 3 02 CPU Unit error; cannot execute.
2210 The specified socket is not been connected.
2607 Specified Socket Service Parameter Area is already being used foranother socket.
15-5-7 Socket/TCP Programming Example
TCP/IP Communications Programming Example
Host comp u ter
Ethernet Unit
IP address: 192.168.250.5
Port n
u m b er: 4096
IP address: 192.168.250.1
Port n
u m b er: 4096
PLC
Host comp u ter
Line
(Ethernet) Ethernet
Unit
CPU Unit
Re qu est S w itches and ex-
ec u tion b its t u rned O N
(see note).
Sent to line.
Processing in
host comp
u ter
Exec u tion b its t u rned OFF