Mitsubishi Electric RD78G4 User Manual page 68

When transient transmission cannot be performed
The following lists the actions to be taken if transient transmission cannot be performed with the target station, and the
engineering tool cannot perform monitoring.
Check item
Is the D LINK LED of the Motion module turned off?
Is the data link status of the target station normal?
Is the network No. duplicated on the network?
Is "  " displayed on the dot matrix LED of the Motion module?
When "Connected Device
Information" under "Basic
Settings" of the master station is
set to "Authentication Class B
Only"
When "Connected Device
Information" under "Basic
Settings" of the master station is
set to "Mixture of Authentication
Class B/A or Authentication
Class A Only"
If the above actions do not solve the problem, perform the following tests to check for an error.
• Communication test ( Page 62 Communication Test)
3 TROUBLESHOOTING
66
3.4 Troubleshooting by Symptom
Are authentication class A devices connected?
Is a general-purpose hub connected?
Are 32 stations or more in total connected?
Are nine or more authentication class B devices
connected to P1 or P2 of the master station?
Are authentication class A devices in line
topology?
Other than the master station, are
authentication class B devices in star topology?
In line topology plus star topology, are
authentication class A devices connected with
the master station in line topology?
Is the master station connected with
authentication class B devices via a general-
purpose hub?
Is an authentication class A device connected
between the master station and authentication
class B devices?
Are the master station and authentication class
A devices in line topology?
Are authentication class A devices connected
to each other?
Is a general Ethernet device connected to
places other than the end of the network?
Are an authentication class A device and a
general Ethernet device in line topology?
Do not use general-purpose hubs other than
the NZ2EHG-T8(N) or DT135TX.
Is a general-purpose hub in cascade
connection?
Action
Perform troubleshooting for when the D LINK LED turns off or is flashing.
( Page 49 When the D LINK LED turns off or is flashing)
In the CC-Link IE TSN/CC-Link IE Field diagnostics, identify the cause of
the error and take action. ( Page 54 Checking the Network Status)
Change the duplicated network No..
Set the module parameters.
Disconnect the authentication class A devices.
Disconnect the general-purpose hub or replace it with a TSN hub.
Reduce the total number of station to 31 stations (master station: 1,
slave station: 30) or less.
Reduce the number of authentication class B devices connecting to P1
or P2 of the master station to eight or less for each.
Do not connect authentication class A devices in line topology.
When connecting an authentication class B device and an authentication
class A device, connect them via a general-purpose hub.
Other than the master station, do not connect authentication class B
devices (via general-purpose hub) in line topology.
For line topology with the master station, connect only with
authentication class B devices.
When connecting the master station and an authentication class B
device, connect them in line topology without a general-purpose hub.
Connect the master station and an authentication class B device without
a general-purpose hub.
Connect the master station and an authentication class A device via a
general-purpose hub.
Connect the master station and an authentication class A device via a
general-purpose hub.
Connect authentication class A devices via a general-purpose hub. (Only
one device for each port of a general-purpose hub)
Connect a general Ethernet device at the end of the network.
Do not connect an authentication class A device and a general Ethernet
device. Even if a general Ethernet device is at the end of the network, do
not connect to it.
Use the NZ2EHG-T8(N) or DT135TX.
Do not connect it in cascade connection.