Checking Communications; Ping Command And Internode Testing; Ping Command; Internode Test - Omron CJ1W-ETN11 Operation Manual

Checking Communications

3-12 Checking Communications

3-12-1 PING Command and Internode Testing

3-12-2 PING Command

3-12-3 Internode Test

The Ethernet Unit supports the PING command, which is also widely sup-
ported by host computers. It also supports a function for internode testing in
the FINS communications service by simply manipulating bits with a Program-
ming Device.
After the settings and connections have been completed, use either the PING
command or the internode test function as required to check communications
with the remote nodes.
The following table outlines the points of difference between the PING com-
mand and internode testing.
Item
Main application
Test objects
Network classification
Address system used
Transmission from Ether-
net Unit
Reception at Ethernet Unit When PING command is
The PING command checks communications with another node by sending
an echo back request packet and receiving a response packet. Use the PING
command as required to check communications. Using the PING command
between nodes that support the PING command makes it possible to check
whether internode communications are normal.
For details on using the PING command, refer to 9-2 PING Command.
The internode test is a function for checking a network by sending data to and
from specified nodes and checking the responses. Use the internode test as
required to check the FINS communications service settings. Using it between
Communications Units and Boards that support it makes it possible to check
whether the FINS communications service settings are correct.
For details on using the internode test, refer to 9-3 Internode Test.
PING command
Testing communications as
an Ethernet node.
Ethernet Units and Ether-
net devices that support
PING.
Within Ethernet networks
(including between seg-
ments).
IP addresses
PING command is issued
to Ethernet Unit by
CMND(490) instruction in
user program.
received, it is automati-
cally returned.
Section 3-12
Internode testing
Checking settings such as
FINS addresses for using
the FINS communications
service.
OMRON Units and Boards
that support FINS commu-
nications service intern-
ode testing.
Up to three levels of Ether-
net networks, and FA net-
works.
FINS address system (net-
work and node numbers)
Note: Requires routing
tables.
Set required parameters in
DM from Programming
Device, and manipulate
start switch bit.
When internode test mes-
sage is received, it is auto-
matically returned.
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