High Security Systems, Technical Manual 2 Basic Demands
TAC AB, Nov 2006 11 (20)
04-00007-01-en
days of data at 30 minute intervals (that is, 384 readings) for each of the
controllers channels, on a rolling re-writeable cycle for a maximum of
10 channels (Xenta 300) / 18 channels (Xenta 401)
The TAC Xenta units logging data or acting as master units should have
an UPS (uninterrupted power supply) backup.
The TAC Xenta OP panel configuration should be set NOT to expose
data objects involved in data logging and all other signals are set to read-
only for the OP panel.
The service menu has to be disabled.
2.1.1 TAC Xenta Protection
After commissioning the TAC Xenta unit is set in protected mode from
TAC Vista. This prevents any serial port access using a code hidden in
a protected memory area in the TAC Xenta.
2.1.2 Functional Description
Data security is governed by the following operations and functions:
• UPS backup on TAC Xenta units ensures uninterrupted local data
logging. Database backups secure the collected data at the TAC
Vista level. The database backups should be copied onto another
media automatically, either by TAC Vista or an external backup
system.
Data integrity is governed by the following operations and functions:
• A manual procedure should be in place that inspects all hardware
used on a regular basis.
TAC Xenta Data Protection
Critical data is set as read only or not shown at all in the OP tree. This
protects the data being logged from being altered via the OP panel.
There is no way of altering the log data stored in the TAC Xenta. Even
though the service menu in the OP panel is protected by a password, it
is recommended that this menu should be disabled to ensure a higher
level of security.
All changes in the TAC Xenta application programming are reported as
an alarm and recorded in the event log in the TAC Vista. The required
Windows access level is needed in order to make any changes in the
TAC Xenta from TAC Vista.
!
NOTE! TAC Xenta version 3.41 or later is required.
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