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3-12
Section
Checking Communications
40
3-12-1 PING Command and Internode Testing
The following table outlines the points of difference between the PING command
and internode testing.
Item
PING command
Internode testing
Main application
Testing communications
as an Ethernet node.
Checking settings such as
FINS addresses for using
the FINS communications
service.
Test objects
Ethernet Units and
Ethernet devices that
support PING.
OMRON Units and
Boards that support FINS
communications service
internode testing.
Network classification
Within Ethernet networks
(including between
segments).
Up to three levels of
Ethernet networks, and
FA networks.
Address system used
IP addresses
FINS address system
(network and node
numbers)
Note: Requires routing
tables.
Transmission from
Ethernet Unit
PING command is issued
to Ethernet Unit by
CMND(490) instruction in
user program.
Set required parameters
in DM from Programming
Device, and manipulate
start switch bit.
Reception at Ethernet Unit
When PING command is
received, it is
automatically returned.
When internode test
message is received, it is
automatically returned.
3-12-2 PING Command
The PING command checks communications with another node by sending an
echo back request packet and receiving a response packet. Use the PING com-
mand 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.
3-12-3 Internode Test
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 re-
quired 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.
Note
1. The internode test can be easily carried out by manipulating dedicated con-
trol switches for the Ethernet Unit. For details, refer to 9-3 Internode Test.
2. Internode testing of the FINS communications service can also be carried
out by means of the FINS commands INTERNODE ECHO TEST and
BROADCAST TEST RESULTS READ. For details, refer to 11-3-4 INTER-
NODE ECHO TEST and 11-3-5 BROADCAST TEST RESULTS READ.