Mitsubishi QJ71LP21 Reference Manual page 209

7 APPLICATION FUNCTIONS
QCPU QJ71
LP21
1) Transfer the remote password
to QJ71E71 when the system
is powered on or it is reset.
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(b) Unlocking and locking the remote password
The remote password is unlocked (connection is allowed) via the modem
by the serial communication module or via Ethernet by the Ethernet
module.
When the remote password is matched, connection to the remote I/O
module is allowed.
The figure below shows the outline of unlocking and locking (connection is
allowed) a remote password with the Ethernet module.
GX Developer
Ethernet
MELSECNET/H
QJ72
QJ71
LP25
E71
3) QJ71E71 checks the remote password.
GX Developer
(c) Number of modules for that can be set to check remote passwords
The table below shows the number of modules that can be set to check
remote passwords.
Module name
Ethernet module
Serial communication module
2) Enter a remote password when connecting
to QJ71E71, and connect to QJ72LP25
after the password is unlocked.
4) The remote password is locked when the
line is closed.
Max. number of modules
4
8
MELSEC-Q
Max. number of modules
in the system
8
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