As shown in figure "A" of the illustration,...

As shown in figure "A" of the illustration, what input conditions are required to produce an output? Illustration EL-0241

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🔍 Key Concepts

• Recognize that series contacts in a ladder diagram represent a logical AND condition, while parallel branches represent a logical OR condition. • Understand that the coils labeled IR1 and IR2 are internal relays energized by combinations of inputs, and the final Output coil depends on the states of IR1 and IR2. • Carefully trace which inputs feed IR1 and IR2, and then how IR1 and IR2 are arranged relative to the Output coil (series vs. parallel).

💭 Think About

• For IR1, look at how Input 1 and Input 2 are drawn: are they in series on one path, or are they on separate parallel branches? What logical operation (AND/OR) does that imply? • For IR2, do the same check with Input 3 and Input 4. Then, look at the rung with the Output coil: are IR1 and IR2 in series or parallel? • Once you know whether each pair is AND or OR, and whether IR1 and IR2 themselves are AND or OR, which answer choice’s wording exactly matches that combination?

✅ Before You Answer

• Be sure you can state clearly: "IR1 is energized when ___ and ___" and "IR2 is energized when ___ and ___" before looking at the answer choices. • Verify whether the rung feeding the Output has one path (series) or two branches (parallel) from the left rail to the Output coil; this is critical to choosing between the options that use AND vs. OR between the two relay conditions. • Double-check that you are matching the words "either" and "both" in the choices to the correct visual patterns of OR (parallel) and AND (series) in the diagram.

🔍 Key Concepts

💭 Think About

✅ Before You Answer