Omron CS1W-ETN21 operation manual Communications Test, Ping Command, Ethernet Unit, Web Functions

Communications Test Section 2-11

For details, refer to SECTION 5 Automatic Clock Adjustment Function in the

Operation Manual Construction of Applications.

Web Functions

CX-Programmer	Setting item
tab
HTTP	Use Web function
	Password
	Port No.

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.

PLC

Ethernet Unit

Remote Node

(host computer or Ethernet Unit)

TCP	UDP
ICMP	IP
	Ethernet

Echo request

Echo response

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.

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