Omron CS1W-ETN21 - Manual (Page 77)

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Communications Test Section 2-11
For details, refer to SECTION 5 Automatic Clock Adjustment Function in the
Operation Manual Construction of Applications.
Web Functions
For details, refer to Appendix G Ethernet Unit Web Function.
2-11 Communications Test
If the basic settings (in particular the IP address and subnet mask) have been
made correctly for the Ethernet Unit, then it should be possible to communi-
cate with nodes on the Ethernet.
This section describes how to use the PING command to perform communi-
cations testing between Ethernet Units.
2-11-1 PING Command
The PING command sends an echo request packet to a remote node and
receives an echo response packet to confirm that the remote node is commu-
nicating correctly. The PING command uses the ICMP echo request and
responses. The echo response packet is automatically returned by the ICMP.
The PING command is normally used to check the connections of remote
nodes when configuring a network. The Ethernet Unit supports both the ICMP
echo request and reply functions.
If the remote node returns a normal response to the PING command, then the
nodes are physically connected correctly and Ethernet node settings are cor-
rect.
2-11-2 Ethernet Unit
The Ethernet Unit automatically returns the echo response packet in
response to an echo request packet sent by another node (host computer or
other Ethernet Unit). An echo request packet can be sent to another node by
issuing the FINS command to execute the PING command from the PLC.
Refer to page 181 for details on the PING command.
CX-Programmer
tab
Setting item
HTTP Use Web function
Password
Port No.
TCP UDP
ICMP
IP
Ethernet
Echo response
Echo request
Remote Node
(host computer or Ethernet Unit)
Ether
net Unit
PLC