User`s manual

89
CHAPTER 3 COMMUNICATIONS BY THE MODEM FUNCTION
3
3.3 Specifications
(c) Stations that can be accessed when the remote password check is performed
• If the external device performs the remote password unlock processing with respect to the Q series C24 of
the directly connected station (local station) after line connection for the modem function, it can access the
local station QCPU.
• When accessing the programmable controller of another station via the Ethernet module of a relay station or
access station, the following settings determine whether access is allowed/prohibited.
• To prohibit access to other station from an external device using the CC-Link IE Controller Network,
MELSECNET/H or MELSECNET/10 relay communication function of the Ethernet module, place a check
mark at the following setting items in the remote password setting for the relay station or access station.
"GX Developer communication port (UDP/IP)
*1
, dedicated commands, CC IE Control, MNET/10(H) relay
communication port"
*1 Set on the GX Developer remote password setting screen.
• If a check mark is not placed at the above setting items, access to other station will be allowed.
• See the user's manual (Basic) for the Ethernet module for stations that can be accessed when accessing
other station programmable controllers via the Ethernet module. (When reading the manual, substitute the Q
series C24 with the station connected to the external device).
(3) Data communications procedure
This section explains the procedure when the external device performs data communication via the Q series C24
in which the remote password check is performed.
(a) Initialization of the modem of the Q series C24 side and external device side is
performed at each device sides.
(b) The line is connected from the external device.
(c) The external device performs the remote password unlock (release) processing for
the QCPU of the station where the Q series C24 is installed using dedicated
commands for MC protocol communication.
*1
(The unlock processing cannot be
performed for the QCPU of other station.)
*1 See Page 121, Section 3.3.7 (8) for what to do when the remote password unlock processing is completed abnormally.
(d) Data communication is performed from the external device using MC protocol.
(e) When data communication using MC protocol is completed, a line for the modem is
disconnected from the external device.
When line disconnection is completed, the remote password lock processing is performed automatically.
Remark
● Refer to the MELSEC Communication Protocol Reference Manual for the unlock processing command for the remote
password.
● When accessing the programmable controller from GX Developer connected to the Q series C24, the remote password
unlock processing is performed when on-line operation begins.