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12.4
Troubleshooting by Symptom
Troubleshooting methods are described by symptom. Perform these troubleshooting if data link cannot be performed
even though no error is detected in the master/local module.
If an error has occurred in the master/local module, identify the error cause using GX Works2.
(
12.4.1
Cyclic transmission cannot be performed
The following lists the actions to be taken if cyclic data are not delivered to the master or a slave station.
If the above actions do not solve the problem, perform the following tests on the master/local module to check for
hardware error.
• Hardware test (
• Self-loopback test (
Check item
Action
Is the D LINK LED of the master or slave station on?
If the D LINK LED is flashing or off, perform troubleshooting.
(
In the network configuration settings of the master station, is a
slave station specified as a reserved station?
Cancel the reserved station setting. (
In the network configuration settings of the master station, is
"RX/RY Setting" or "RWw/RWr Setting" for slave stations
configured?
Set RX/RY or RWw/RWr data for each slave station within the allowable
range. (
Do the station numbers set in the network configuration settings
of the master station match those set for corresponding slave
stations?
Correct station number (s).
Do the station types set in the network configuration settings of
the master station match those set for the connected slave
stations?
Check the station types set in the network configuration settings of the
master station.
Are the refresh parameters set within correct ranges?
Correct the refresh parameters. Link devices and link refresh assignment
can be confirmed in either of the following.
• Network Configuration Settings (
• "Assignment Image" window (
Is any refresh target device in the refresh parameter window
overlapped with that of another network module?
Correct the refresh parameters. Overlap of a refresh target device can
be checked in the "Assignment Image" window through GX Works2.
(
Are the transfer ranges for interlink transmission parameters
correct?
Check the interlink transmission parameters. Overlapping of a transfer
range can be checked in the assignment image in GX Works2.
(
Are the source and destination modules correctly set for
interlink transmission parameters?
Check the interlink transmission parameters. (
Is the station number of the master/local module duplicated with
any of the other stations?
Change the duplicated station number.