Document No: LT0117 F4000 LCD Operator's Manual
System Description
Issue 2.38 19 April 2002 Page 2-25
2.5.7 NETWORK EXCEPTIONS
2.5.7.1 GENERAL
Network commands issued by one network FIP and sent to another may result in some
event, error or "exception" that it is desirable to display at the source of the command.
These exceptions may occur a significant period of time after the original command was sent
and accepted. An operator may need to remember what commands were sent to a
particular network FIP to be able to interpret the exception correctly.
As an example of an exception, a multi-zone de-isolation may leave some zones isolated,
because some zones have an active alarm or fault status.
A network panel is able to send special messages to the source of the command, indicating
the type of exception that has occurred. The receiver of the exception can then recognise
and display the data appropriately.
Exceptions have a level of priority assigned to them by the sender. An F4000 can be
programmed as to which priorities of exceptions get displayed, and which get ignored.
Consequently, some F4000s may only display more urgent exceptions, while others show
both the more urgent and less urgent exceptions.
2.5.7.2 DISPLAY OF EXCEPTIONS AT AN F4000 LCD FIP
When an exception is received by an F4000, the following occurs:
(i) If the FFCIF is not active:
(a) The LCD/keypad is interrupted from what it is displaying (although any
background display processing still operates, eg. zone or point status
searches).
(b) The LCD displays the SID number of the panel that sent the exception and a
"Press any key" prompt on the first line, and the exception message received
on the second line.
(c) Pressing any key will clear the exception display and the LCD keypad will
revert to its original display.
(d) If the FFCIF becomes active while an exception display is being displayed,
the exception is automatically cleared.
(e) Any new exception received before the current exception is cleared will be
ignored.
(ii) If the FFCIF is active, the received exception is discarded, so as not to disturb the
alarm information displayed.
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