8.1 The next step is to develop block diagram(s)
showing the functional flow sequence of the system, both for technical
understanding of the functions and operation of the system and for
the subsequent analysis. As a minimum the block diagram shall contain:
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.1 breakdown of the system into major sub-systems
or equipment;
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.2 all appropriate labelled inputs and outputs
and identification numbers by which each sub-system is consistently
referenced; and
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.3 all redundancies, alternative signal paths
and other engineering features which provide "fail-safe" measures.
An example of a system block diagram is given at appendix 1.
8.2 It may be necessary to have a different set
of block diagrams prepared for each operational mode.