Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 25)

1-8
IM 04L31A01-17E
Other Functions
When carrying out communications via the Ethernet interface, the following additional
functions can be used.
User Control
User control for connection can be set up to prevent false access to the CX when using
the functions of the setting/measurement server, maintenance/test server, and FTP
server. User control is performed by registering user names and passwords beforehand
and entering the appropriate user name and password at the time of connection.
Up to 7 users can be registered, and access authority are set for each user. There is a
limitation on the number of simultaneous connections and simultaneous usage from PCs
to the CX. For details, see sections 2.1 and 2.7.
Note
Access authority refers to a function that authorizes specified users for operating the CX. There
are two levels of access authority: “ADMINISTRATOR” and “USER.” An ADMINISTRATOR is
given access authority to use all the functions. Only a single ADMINISTRATOR can be
registered. USERs are not given authority to set functions, but can view the data, load files, and
so on.
Checking the Condition of the Connection
You can check the physical connection to the Ethernet interface. When connected to the
Ethernet network, you can check the connection on the lamp on the rear panel or the
indication on the display.
Note
For a description of the location and meaning of the connection status indicator, see section 2.4.
Keep alive (Extension Function of TCP)
Keep alive is a function used to periodically send inspection packets to a PC that is
connected to the CX via the network. If a response is not received, this function forcibly
disconnects the connection. This function can be used to automatically disconnect users
that are connected but are not using the CX and allow connection of new users.
Note
For details on setting the keep alive function, see section 2.7.
Displaying Error, Communication, FTP, Web Operation, and E-mail Log Screens
The CX stores a communication log of the Ethernet interface. The following logs can be
shown of the CX display.
• Error log screen:
Log of operation errors.
• Communication log screen: Log of communication input/output.
• FTP log screen:
Log of file transfers executed using the FTP client.
• Web operation log screen: Log of operations using the Web server function.
• E-mail log screen:
Log of e-mail transmissions.
Note
For the procedure of displaying the log screens, see section 2.8.
1.2 Ethernet Communication Function