Mitsubishi Electric MELSEC iQ-R Series User Manual page 158

Data communication when remote password is set
This section explains how to use and set the CPU module remote password function, and data communication between the
target device and the CPU module when a remote password has been set.
■Permitting/prohibiting access from target device to programmable controller
Access permission processing (unlock processing)
• To access to the specified CPU module, the target device performs the remote password unlock processing to the C24
the directly connected station (host station) after line connection for the modem function.
• If the unlock processing has not been performed, accessing to the specified station is prohibited by the remote password
check performed by C24
(Page 158 Remote password check processing performed by C24)
• All received data before the unlock processing is performed will be processed as an error.
*1 It indicates the C24 on the CPU module station to which a remote password is set.
 Access processing
• Normal completion of the remote password unlock processing allows the access to the specified station.
• Perform communication using the MC protocol.
 Access prohibition processing (lock processing)
• To complete the access to the specified station, perform the line disconnection processing for the modem function in order
to disable further access.
• When the modem disconnection is completed, the remote password lock processing is performed automatically.
(When accessing the host station RCPU)
Modem
Ó
Access
Remote password
Remote password
check
CPU module
*1 Unlock and lock processing of the remote password for the host station is possible.
Remote password unlock and lock processing for the relay station and access station cannot be performed.
*2 Lock processing is performed when a line for the modem function is disconnected.
*3 For an Ethernet module which transmits a communication request to other Ethernet, the unlock and lock processing is not necessary
even it is set as the subject of remote password check.
7 COMMUNICATIONS BY THE MODEM FUNCTION
156
7.3 Specifications of Modem Function
*1
, which received the communication request.
Ò
Unlock processing
Ô
Lock processing(*2)
(Host station)
C24
(When accessing other station RCPU)
A station
(*1)
Modem Modem
Remote
password
CPU module
CPU module
CPU module
Ò
Unlock processing
Ô
Lock processing(*2)
Remote password
(*3)
check
Ethernet
C24
module
Ethernet Ethernet
module module
Ó
Access
Ethernet
(Access station)
module
*1
on
A station
(*1)
Modem
(Host station)
Ethernet
(Relay station)
Ethernet