SKF Multilog On-Line System IMx-M User Manual page 162

Protection
Protection Module Configuration with IMx-M Manager
However, when configuring Advanced Channel logic, remember that in many instances
it may be possible (assuming the source channels are from the same slot) to greatly
simplify expressions by the use of Boolean logic.
For example, the three condition expression: (CH1 OR CH2) AND (CH1 AND CH3 AND
CH4) OR (CH4 OR CH5)
Can be expressed as:
» (CH1+CH2) x (CH1xCH3xCH4) + (CH4 + CH5)
» CH1 x CH1 x CH3 x CH4 + CH1 x CH2 x CH3 x CH4 + CH4 + CH5
Remember that x.x = x, so the above expression simplifies to:
» CH1 x CH3 x CH4 + CH1 x CH2 x CH3 x CH4 + CH4 + CH5
» CH1 x CH3 x CH4 x (1 + CH2) + CH4 + CH5
Remember also (1 + x) = 1, and (1.x) = x, so the expression above simplifies to:
» CH1 x CH2 x CH3 x CH4 + CH4 + CH5
While x + x.y = x, so the expression further simplifies to:
» CH4 + CH5
Although this clearly only applies to channels from the same slot, it is always worth
considering what simplifications can be made when implementing an advanced (logic
based) solution.
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