Precautions - Mitsubishi Electric Q03UDVCPU User Manual

10.3

Precautions

(1) When a remote password is set for UDP connections
• Determine a target device before data communication. (The communication target needs to be determined
because, after unlocking of the remote password, communication is available with any other devices.)
• 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 disable direct connection with the parameter.
(2) When a TCP/IP connection is closed before lock processing
The CPU module automatically performs lock processing.
(3) Remote password valid range
The remote password is valid only for access from the Built-in Ethernet port QCPU for which the parameter
settings were made. When multiple CPU modules are used in a multiple CPU system, set a remote password for
each setting target CPU module respectively.
Enable/
Disable
Remote password
check
Remote password
parameter
No.1 No.2
1)
Ethernet
2)
3)
4)
No remote password
parameter
Remote password is checked in
access 1) and 2),
but not checked in access 3) and 4).
CHAPTER 10 REMOTE PASSWORD
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