Mitsubishi MELSEC L Series User Manual page 69

GX Developer parameter setting
• Remote password
• Module subject to the remote
password check
Set in the local station to allow/prohibit access to
the network System 1 from the external device.
(Relay
station)
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(6) Remote password check
If the remote password check has been set for the Q series C24 installed in the
QCPU, the Q series C24 executes a remote password check when the
programmable controller is accessed from an external device using the Q series
C24 modem function.
The following is an overview of the QCPU remote password function. See
Section 3.3.3 for more details.
(a) Remote password function
The remote password function allows / prohibits access to the QCPU from
an external device via the following modules.
• Q series C24
• Ethernet module
• Built-in CPU of Ethernet port
In the case of the Ethernet module, the remote password function can be
used for data communications connections with an external device. For
details, see the User's Manual (Basic) for the Ethernet module.
(b) Station where the remote password and remote password check are set
1) In the case of a programmable controller system with one QCPU station
QCPU
Q series C24
Remote
password
2) In the case of a programmable controller system consisted of multiple
QCPU stations
Set in the QCPU station which is the entrance of the programmable
controller system as viewed from the external device (the local station
QCPU in the diagram below).
Remote
password
(Local station)
QCPU
Ethernet Ethernet
QCPU
module module
Not set in the relay station or access station. ( )
When set in a station other than the QCPU which is the entrance of
the programmable controller system (relay station or access station in
the above diagram), access to other stations beyond the set station is
prohibited.
Remote
password Modem
check
Remote
password
check
Ethernet
Q series C24
module
Ethernet
(Access
Ethernet
QCPU
station)
module
Ethernet
Network System 1
3 COMMUNICATIONS BY THE MODEM FUNCTION
External device
access source
Public line
Modem
Communication executing the
remote password check
• Communication using MC protocol
• Communication using the GX Developer
Public line
Modem
Modem
External device
access source
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