Omron SYSMAC CJ1W-EIP21, Operation Manuals

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6 Testing Communications
6-2
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
6-1 Testing Communications
If the basic settings (in particular the IP address and subnet mask) have been made correctly for the
EtherNet/IP Unit, then it is possible to communicate with nodes on the EtherNet/IP network. This sec-
tion describes how to use the PING command to test communications with the EtherNet/IP Unit.
The PING command sends an echo request packet to a remote node and receives an echo response
packet to confirm that the remote node communications are normal. The PING command uses the
ICMP echo request and responses. The echo response packet is automatically returned in the ICMP.
The PING command is normally used to check the connections of remote nodes when you set up a net-
work. The EtherNet/IP Unit supports both the ICMP echo request and response functions. If the remote
node returns a normal response to the PING command, then the nodes are physically connected cor-
rectly and Ethernet node settings are correct.
The EtherNet/IP Unit automatically returns the echo response packet in response to an echo request
packet sent by another node (e.g., host computer).
6-1-1 PING Command
6-1-2 Using the PING Command with the EtherNet/IP Unit
Echo response
Echo request
Remote node
(e.g., host computer)
EtherNet/IP Unit
Ethernet
ICMP IP
UDP TCP