Remote password is checked when a connection is requested for the following.
• Communication using an engineering tool
• Communication using SLMP
• Communication using FTP port
The remote password function is one of the methods for protection against unauthorized access (e.g.
destruction of data and programs) from external devices.
However, this function cannot completely prevent unauthorized access.
Other measures should be taken at users' discretion if security of the programmable controller system against
unauthorized access from external devices needs to be maintained. Mitsubishi Electric cannot be held
responsible for any problems caused by unauthorized access.
[Examples of measures against unauthorized access]
• Install a firewall.
• Set up a personal computer as a relay station, and control the relay of communication data using an
• Set an external device that can control access rights as a relay station (For external devices that can control
access rights, please consult your network service provider or networking equipment vendors.)
Communication using remote password
Communication is performed in the order described below when a remote password is set for the CPU module.
Allowing access (Unlock processing)
On a communication device such as a personal computer, unlock the remote password set for the CPU module.
If it is not unlocked, an error will occur on the connected device because the CPU module will prohibit any access.
Access the CPU module after successful completion of the remote password unlock processing.
Prohibiting access (Lock processing)
When terminating access from the personal computer, lock the remote password to prohibit access from any other personal
[Accessing the Host CPU]
11 SECURITY FUNCTION
11.2 Remote Password