User`s manual

88
(2) Remote password check processing performed by the Q series C24
(a) Communication in which a remote password check is performed
1) When the following parameters are set for the Q series C24 installed in the QCPU station, the Q series C24
performs a remote password check for communication requests listed below.
• When a remote password is set in the QCPU
• When the Q series C24 that is communicating data with the external device has been set as a module
subject to the remote password check
2) The Q series C24 performs a remote password check with respect to a communication request to the local
station/other station received from the external device.
3) The Q series C24 does not perform a remote password check for the following communication requests.
• Transmission request from the local station QCPU (such as transmission using non procedure protocol)
• Communication request from the external device (including GX Developer connected to the local station
QCPU) transmitted to other station upon request from the QCPU
*1 In the above diagram, a communication request from the external device cannot be received since the remote password
check setting has been executed.
If the remote password check setting has not been executed, a communication request can be received and data
communication from the external device is possible.
(b) Selecting modules subject to the remote password check
The user can select any Q series C24 to perform the remote password check and set this using QCPU
parameters. (This is set on the GX Developer remote password setting screen.)
QCPU
GX Developer
QCPU
(*1)
2)
1)
3)
3)
Path for items subject
to remote password check
Path for items not subject
to remote password check
Remote password
check
Remote password
check
(Local station)
(Other station)
Ethernet module
Remote password
Remote
password
ModemModem
Q series
C24
Ethernet module