Mitsubishi Electric MELSEC iQ-F Series - RAS Functions

4 FUNCTIONS
4.5 Security
57
4
Accessible station
The station accessible from the external device when a remote password is set for the FX5 CPU module and the station that
can unlock/lock the remote password are limited to those with the same network number.
The following figure shows an example when the remote password is set for multiple stations in the system.
Ex.
The A station can access the  station after the remote password for 1-1 station (1) is unlocked. The  station can be
accessed if the communication line is open.
The B station can access the  station if the communication line is open.
: Station accessible from external device after remote password is unlocked
: Station accessible from external device even if remote password is not unlocked
Precautions
The following describes the precautions when remote password is used.
Setting of remote password for connection
Set the remote password for the connection used for data communications with an external device that can execute the
unlock/lock processing.
When remote password is set for UDP/IP connection
• Determine the external device to communicate with and perform data communications. (With UDP/IP, after the remote
password is unlocked, data can be exchanged with devices other than the unlocked external device too. Determine the
communication destination before starting to use.)
• Always lock the remote password after data communication is finished. (If the remote password is not locked, the unlocked
state is held until timeout occurs.)
TCP/IP close processing
If the TCP/IP is closed before the TCP/IP is locked, the FX5 CPU module will automatically start the lock processing.
Remote password valid range
The remote password is valid only for access from the FX5-CCLGN-MS for which the parameters are set. In a system
configuration in which multiple modules are used, set a remote password for each module which requires a remote password.
Accessing the programmable controller of another station
When the external device is accessing the programmable controller of another station via the FX5-CCLGN-MS, accessing the
programmable controller may not be possible if a remote password is set for the FX5 CPU module at the relay station or
station to be accessed.
The password can be unlocked and locked by the following external devices.
• 1-1 station (1): A station only
External device
(Request source)
Target programmable controller (request destination)
1-1 station CPU 1-2 station CPU
A station 
B station 
FX5-CCLGN-MS
FX5-CCLGN-MS
(1)
(1)
Station A
Remote
password
Remote
password
check
FX5
CPU
module
Network No.1
Station 1-2
Station 1-1
Engineering tool
FX5
CPU module
Station B
Ethernet