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Checking Communications Section 3-11
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3-11 Checking Communications
The FL-net Unit supports the PING command, which is also widely supported
by host computers. It also supports a function for internode testing in the FINS
communications service by simply manipulating bits with a Programming
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.
Networking checks using the PING command and internode testing can be
executed regardless of the PLC’s operating mode, but it may have an effect on
operation by increasing network traffic and adding more internal processing
for the FL-net Unit.
It is recommended that the testing be performed with the tested node in PRO-
GRAM Mode, or in an environment in which message servicing is not exe-
cuted.
3-11-1 PING Command and Internode Testing
The following table outlines the points of difference between the PING com-
mand and internode testing.
3-11-2 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
command as required to check communications. Using the PING command
from a personal computer on an Ethernet network makes it possible to check
whether Ethernet internode communications are normal.
3-11-3 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
required to check the communications between FL-net nodes. Use it as
required to check message communications.
Note The internode test can be easily carried out by manipulating dedicated control
switches for the FL-net Unit. For details, refer to
9-3 Internode Test .
Item PING command Internode testing
Main application Testing communications as
an Ethernet node. Testing as an FL-net node.
Test objects FL-net Units and Ethernet
devices that support PING. FL-net Units and devices
supporting FL-net.
Network classification Within Ethernet networks
(including between seg-
ments). Within FL-net networks.
Address system used IP addresses Node numbers
Transmission from FL-net
Unit Cannot be sent from this
Unit. From Programming
Devices for PLC, set the
required parameters in
CIO words allocated to
CPU Bus Units and turn
ON the Start Bit.
Reception at FL-net Unit When PING command is
received, it is automati-
cally returned. When internode test mes-
sage is received, it is auto-
matically returned.