NASA NTRS · 19700000504
Fail-safe numerical control
Abstract
System provides duplicate set of control logic circuitry. Comparators insure that the same data is present in both circuits. If any discrepancy is found, the machine is automatically stopped, before damage can occur.
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Thompson, G. A.. 1970-11-01. Fail-safe numerical control. https://ntrs.nasa.gov/citations/19700000504
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