Start Date
4-1971 8:00 AM
Description
The solid-state sequencer system (S 4 ) was developed under a contract for NASA-MSC. It is completely programmable via a core memory, is very reliable, and uses very little power. The program delivered under contract was to enable a complete duplication of the function of the Apollo relay sequencer. A reprogramming and possible change in the output circuit complement would enable use of the same design for most conceivable space applications such as Space Shuttle and deep-space exploration.
In addition to a reliability goal of 0.999999 for a six-month time period, the system has the requirement that no single failure can cause the loss of an output or the generation of a wrong output. The philosophy used to meet this requirement is two identical channels as shown in Figure 1, where each channel is designed so a single failure cannot provide a wrong output, but may fail to give an output. The remainder of this paper will discuss a single channel.
Redundant Solid-State Sequencer
The solid-state sequencer system (S 4 ) was developed under a contract for NASA-MSC. It is completely programmable via a core memory, is very reliable, and uses very little power. The program delivered under contract was to enable a complete duplication of the function of the Apollo relay sequencer. A reprogramming and possible change in the output circuit complement would enable use of the same design for most conceivable space applications such as Space Shuttle and deep-space exploration.
In addition to a reliability goal of 0.999999 for a six-month time period, the system has the requirement that no single failure can cause the loss of an output or the generation of a wrong output. The philosophy used to meet this requirement is two identical channels as shown in Figure 1, where each channel is designed so a single failure cannot provide a wrong output, but may fail to give an output. The remainder of this paper will discuss a single channel.
Comments
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