Access Permit/Prohibit Processing Operation; Remote Password Check Operation; Access Permit Processing; Communication That Is Checked - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

Access permit/prohibit processing operation

This section describes the processing for permitting or prohibiting access of the CPU module with remote password by the
external device.
■Access permit processing (Unlock processing)
The external device trying to communicate unlocks the remote password set for the connected Ethernet-equipped module.
If the password is not unlocked, the Ethernet-equipped module to which the external device is connected prohibits access, so
an error occurs in the external device.
The unlocking method is shown below.
• SLMP dedicated command (Remote Password Unlock)
• Dedicated command (password-unlock) for file transfer function (FTP server)
• Input password from engineering tool
■Access processing
Access to the specified station is possible when the remote password is correctly unlocked. Execute the arbitrary access.
■Access prohibit processing (Lock processing)
When access to the specified station ends, lock the remote password from the external device to disable subsequent access.
The locking method is shown below.
• SLMP dedicated command (Remote Password Lock)
• Dedicated command (password-lock) for file transfer function (FTP server)
• Lock with engineering tool (executed automatically)

Remote password check operation

■Communication that is checked

The Ethernet-equipped module checks the remote password for a communication request made to the own station or other
station received from the external device.
When checking a remote password for modules with multiple connections, the connection for which the remote password is
set.
(3)
Engineering tool
*1 The remote password check is set, so the communication request from the external device is not accepted. If the remote password
check is not set, the communication request can be accepted and data can be exchanged from the external device.
CPU module
Remote password
Remote password
check
(Own station)
(2)
(Another station)
Engineering tool
RJ71EN71
(3)
CPU module
Remote Remote password
password check
(*1)
RJ71EN71
Path checked using
a remote password
Path not checked using
a remote password
1 FUNCTIONS
1.13 Security Function
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