Mitsubishi Electric RD78G4 User Manual page 67

Check item
When "Connected Device Are 32 stations or more in total connected?
Information" under "Basic
Settings" of the master station is
Are nine or more authentication class B devices
set to "Mixture of Authentication
connected to P1 or P2 of the master station?
Class B/A or Authentication
Are authentication class A devices in line
Class A Only"
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
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 star 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.
3.4 Troubleshooting by Symptom
3 TROUBLESHOOTING
3
65