NASA Office of Logic Design

NASA Office of Logic Design

A scientific study of the problems of digital engineering for space flight systems,
with a view to their practical solution.


NASA SP-504: Space Shuttle Avionics System

Section 4  System Mechanization/Operation

Sequencing

A number of non-GNC functions included in the redundant-set software perform critical sequencing and other services for nonavionics subsystems. These functions, conducted using either the master events controller or the flight-critical MDM's as the command transmission media, use the system components shown in figure 4-31. The sequencing functions can be classified as (1) mission events that are nonrepeating but predictable and that require software to initiate and/or to control hardware functions or (2) special computations made to reduce crew workload. Examples of the current set of such functions include

figure_4_31.jpg (57182 bytes)

Figure 4-31. - Sequencing configuration.


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