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8.9 Protection Against Data Tampering
General disabling of
data access
Restricting access
to the PLC partition
December 2001
Due to the possibility of networking the TNC 426/430 and accessing it
remotely, protection from data tampering became necessary.
The following protection mechanisms are integrated:
n
General disabling of data access by soft key
n
Restricting access to the PLC partition
n
Restricting access to parts of the TNC partition
This function was added for the end user. Please see the notes in the User's
Manual.
Soft key
Meaning
This soft key disables access to the control using the LSV2
protocol, via both the serial and the Ethernet interfaces. It can
be displayed in any operating mode with the MOD key.
The soft key is normally not shown. To display the soft key:
7 7 7 7
Enter the codeword REMOTE.LOCKSOFTKEYVISIBLE = YES in OEM.SYS.
Up until NC software 280 476-09 it is always possible to enter the PLC
partition via the LSV2 protocol using the code number 807667, even if
PLCPASSWORD = was used to define a new codenumber in OEM.SYS.
In the standard setting, the PLC partition can be accessed via the LSV2
protocol using the codenumber 807667. To permit this access only with the
codenumber defined in OEM.SYS under PLCPASSWORD = (no longer with
807667):
7 7 7 7
Enter the codeword REMOTE.PLCPASSWORDNEEDED = YES in OEM.SYS.
Up until NC software 280 476-18, codenumber 807667 is used during machine
backup, full backup and setup with the LSV2 protocol to access the PLC
partition. To permit this access only with the codenumber defined in
OEM.SYS under PLCPASSWORD = (no longer with 807667):
7 7 7 7
Enter the codeword REMOTE.PLCPASSWORDFORCED = YES in OEM.SYS.
Protection Against Data Tampering
8 – 49
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