Precautions - Mitsubishi Electric QJ71E71-100 User Manual

14.4.5

Precautions

The precautions for using the remote password function of the E71 are provided below.
(1) Timing of activating a remote password
To enable the remote password setting, power off or reset the CPU module. After a remote password has been
set, restart the CPU module. (CPU number 1 in a multiple CPU system).
(2) Target connections
Set a remote password check only for the connections used for data communications with the connected devices
that can perform unlock and lock processes.
In communications using a fixed buffer, do not set the remote password check for the connections
Ex.
through which the connected device receives data sent from the CPU module.
(3) Connections where "No Procedure" communications using a fixed buffer are
performed
Do not set a remote password check for connections where "No Procedure" communications using a fixed buffer
are performed. The remote password check is not performed for such connections.
(4) Access to the programmable controller on another station
When the connected device accesses the programmable controller on another station through the E71, it may fail
to access the remote-password-protected CPU modules on the relay station or the station to be accessed.
(5) For UDP/IP communications
(a) Connected device for data communications
Do not perform data communications with unspecified connected device. Set the destination device.
(b) Alive check function
Use the alive check function of the E71.
password lock process. If the process is not performed, data communications from other devices are enabled
until a timeout occurs by the alive check function of the E71. For this reason, when setting a connection with
the connected device using a programming tool, set the parameters as follows.
• When configuring the initial setting, set the start interval timer value and the interval timer value for the
alive check function as small as possible.
• When configuring the open setting, select "Confirm" under "Existence Confirmation".
*1 The alive check is automatically performed when the connection for data communications through the auto-open UDP
port is set as the target for the remote password check.
(6) Communications from the programming tool in the Ethernet connection
For communications from a programming tool in the Ethernet connection, using TCP/IP communications is
recommended.
*1
Also, when terminating data communications, perform the remote
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