Precautions - Mitsubishi Electric FX5 User Manual
Melsec iq-f series, ethernet communication
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Writing to the CPU module
Write the set remote password to the CPU module from the "Write to PLC" screen.
[Online][Write to PLC]
After writing the parameters to the CPU module, power off on or reset the CPU module to enable the parameters.
Unlocking or locking the remote password
The remote password is unlocked or locked from an external device such as a personal computer, as described below.
■When using MELSOFT connection
Enter a remote password in the following screen that appears during communication.
When the remote password is entered, the engineering tool performs unlock processing and then accesses the CPU module
■In case of SLMP
Use commands dedicated to SLMP. (Lock /unlock of Page 36 Command list)
■In case of FTP Transmission Port
Use the dedicated FTP command. (Page 105 FTP command list, password-lock/password-unlock)
Precautions
When a remote password is set for UDP connections
• Determine a target device before data communication. (At the time of SLMP setting, set "Host station port number",
"Communication target IP address", "Communication target port number", and limit the communication target.)
• At the end of data communication, always lock the remote password. (If the lock processing is not performed, the unlock
state is held until a timeout occurs. No communication for 10 minutes causes a timeout, and the CPU module automatically
performs lock processing.)
To prevent unauthorized access using the remote password setting, it is recommended to set all connection protocols to TCP/
IP and set the parameter to disable direct connection.
When a TCP/IP connection is closed before lock processing
The CPU module automatically performs lock processing.
Further, when protocol is set to TCP, connection is verified by KeepAlive. (Response to KeepAlive ACK message)
An alive check message is sent 5 seconds after reception of the last message from the device with which communication is
being done to check if the device returns a response or not. If no response is received, the alive check message will be resent
at intervals of 5 seconds. When no response is received for 45 seconds, the connected device is regarded as non-existent
and the connection is disconnected.
Therefore, the lock process is automatically executed when the connection is cut.
Valid range of remote password
The remote password is valid only for accessing the module (communication port) for which the parameter is set.
In case of a system configuration that uses multiple modules, set a remote password for each module (communication ports).
11 SECURITY FUNCTION
136
11.2 Remote Password
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