• Is equipment which is replaced or no longer required disposed of in a way which does
not compromise the system (e.g. through leakage of secrets, configuration, etc.)?
Note that this consideration applies to all types of networks including those considered “private”.
Often “private” networks will have external connections to some services and may also have some
internal threats. These need to be identified and considered in order to ensure that the system is
secure.
Connection
When connecting to systems other than Stratos it is important to set the network configuration
before connecting the controller to a network using the Ethernet port on the CPU card. This is
because the CPU card may be a spare which has been configured for and used on another
controller site. It could therefore contain network configuration which would interfere with the
site currently being installed.
The network is configured as follows;
• Status and Configuration → System → Comms → DSL / Fibre web page
Full details on how to configure then network interface can be found in the ST950 User Interface
Handbook 667/HU/46000/000.
6.9.11 Setting the Date and Time
There are two clocks within the system:
• System - used for non controller applications
• Controller - used by the controller application
These clocks can run independently or be joined together to match the way in which the ST950 is
being used. This relationship between the clocks is called the Time Mode. There are three options
for Time Mode, used as follows:
• System Time - controller clock is synchronised to system clock. Use this mode where NTP or
GPS is providing the source of time to the whole ST950 system and synchronisation to other
controllers (e.g. mains synchronisation for CLF) is not required.
• Controller Time - system clock is synchronised to the controller clock. Use this mode where
there is no NTP or GPS time source and the system is to maintain its own time (usually
mains synchronised).
• Dual Time - system and controller clocks keep independent time. Use this mode where the
system clock must be synchronised to NTP or GPS but the controller clock needs to be
synchronised to neighbouring controllers e.g. to support mains synchronised CLF.
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