Interlock Architectures — Part 5: Category 4 — Control Reliable
The block diagram for Category 4 is almost identical to Category 3 and was updated by Corrigendum 1 to the diagram below. The text from the corrigendum that accompanies the diagram
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Interlock Architectures — Part 5: Category 4 — Control
The block diagram for Category 4 is almost identical to Category 3
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