Mitsubishi Electric MELSEC Q Series User Manual page 45

1 OVERVIEW
(Plant/Production field)
Web server module
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(13) Seamless access beyond network hierarchies
Using the Web server module as a gateway, the statuses of the programmable
controller CPUs connected hierarchically with Ethernet, MELSECNET/H and/or
CC-Link can be monitored and those data can be collected.
(14) High capacity and backup memory
(a) Processing of large data volume
Large volume of data that is beyond capability of the programmable
controller CPU can be processed using the standard ROM and
CompactFlash card.
Saving device data in file format and accessing them from a remote
location is available using Web browser or FTP.
(b) Backup/Restoration of standard ROM data
The data (setting information, logging data, user HTML, etc.) of the
standard ROM can be backed up on the CompactFlash card. It is also
possible to restore the data of the CompactFlash card onto the standard
ROM.
(c) Power off without shut-down operation
The file protection battery allows power to be switched on/off any time
without troublesome shut-down operation. (When a battery is installed)
(15) Prevention of illegal access by user authentication and IP filter
functions
(a) By basic authentication of the user name and password, the Web server
module can restrict access of users and setting operations.
(User authentication function)
(b) The IP address of the access source can be identified to restrict access.
(IP filter function)
(Example) Using IP filter function
3)
2)
1)
When access is made from an intra-company LAN (client 1), 2)),
registering the IP address of the proxy server to the IP filter
shuts off external access (client 3)), enabling access from only
the intra-company LAN.
Internet
MELSEC-Q
Client 3)
Proxy server Intra-company
LAN
Client 2)
Client 1)
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