Pump interlock Karnaugh map

This pump-interlock example turns a truth-table output into a four-variable grid that can be reviewed with the control logic. Repeated ones in adjacent positions highlight candidates for eliminating variables, while the fully asserted third row offers a larger grouping opportunity. A Karnaugh map is most useful when the function has few variables and the person reviewing it needs to see why a term disappears. Verify the resulting expression against the original truth table before putting it into a programmable controller. Before sharing it, compare the chart with the source table and make the scope explicit. A clear date range, population and unit help another reader interpret the pattern correctly and decide whether follow-up analysis is needed.