7 COMMUNICATIONS BY THE MODEM FUNCTION
7.3 Specifications of Modem Function
159
7
■Stations that can be accessed when the remote password check is performed
• The remote password unlock processing to the C24 on the directly connected station (host station) after line connection for
the modem function enables the target device to access to the CPU module on the host station.
• When accessing the programmable controller on other stations via the Ethernet module on a relay station or access station,
the access is allowed/prohibited by the settings below.
To prohibit access to other station from a target device using the IP packet transfer function of the Ethernet module, select
the checkbox for "MELSOFT Transmission Port (UDP/IP)" on the "Remote Password Detail Setting" screen for the relay
station or access station.
For the stations that can be accessed when accessing to the CPU module on the other stations via Ethernet module, refer
to the following manual.
(Refer to it by substituting the station connected to a target device with C24.)
( MELSEC iQ-R Ethernet User's Manual (Application))
Data communication procedure
The following shows the procedure when a target device performs data communication via C24 to which the remote password
check is performed.
1. Initialization of the modem on the C24 side and target device side is performed at each device sides.
2. The line is connected from the target device.
3. The target device performs the remote password unlock (release) processing for the CPU module on the station where
C24 is mounted using dedicated commands for MC protocol communication.
(The unlock processing cannot be performed for the CPU module of other station.)
For what to do when the remote password unlock processing is completed abnormally, refer to the following section.
(Page 150 Remote password check)
4. Data communication is performed from the target device using MC protocol.
5. When data communication using MC protocol is completed, a line for the modem is disconnected from the target device.
When line disconnection is completed, the remote password lock processing is performed automatically.
■Remarks
• For more details on the unlock processing command to the remote password, refer to the following manual.
(MELSEC Communication Protocol Reference Manual)
How to set the remote password
For the remote password setting method, refer to the following manual.
GX Works3 Operating Manual
To Next Page
Loading...
