If the illustrated SR bistable latch...

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Question 1 of 205eccefa5bacbc34ba4d48874

If the illustrated SR bistable latch function block PLC ladder diagram represents a subroutine used for a fire alarm system, which statement is true? See illustration EL-0248.

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Question 1 of 20

5eccefa5bacbc34ba4d48874

If the illustrated SR bistable latch function block PLC ladder diagram represents a subroutine used for a fire alarm system, which statement is true? See illustration EL-0248.

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🔍 Key Concepts

• SR (Set/Reset) bistable latch logic: what does the S input do vs. the R input? • In a fire alarm system, which devices should be able to start an alarm, and which should only be able to clear/acknowledge an existing alarm? • In ladder diagrams, multiple contacts in parallel feeding a latch input usually represent multiple independent ways to trigger the same action.

💭 Think About

• Look at which side of the latch block the three sensors are connected to and which side the single switch at the bottom is connected to. Is that the S (set) or R (reset) input? • In a properly designed fire alarm, should an acknowledgement/clear switch be able to start the alarm, or only silence/reset it? • If any one of the three upper inputs closes, what happens to the alarm coil, and what does that tell you about what those three inputs must represent in a real fire system?

✅ Before You Answer

• Verify which contacts (Inputs 1, 2, 3 vs. Input 4) are wired to the Set (S) input and which are wired to the Reset (R) input of the latch. • Confirm that any of Inputs 1, 2, or 3 can independently energize the alarm, while Input 4 alone cannot start the alarm but can clear it. • Match that behavior to the real-world functions: initiating devices (detectors/pulls) vs. an alarm acknowledge/clear control station.

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Question 1 of 205eccefa5bacbc34ba4d48874

If the illustrated SR bistable latch function block PLC ladder diagram represents a subroutine used for a fire alarm system, which statement is true? See illustration EL-0248.

Back

Question 1 of 20

5eccefa5bacbc34ba4d48874

If the illustrated SR bistable latch function block PLC ladder diagram represents a subroutine used for a fire alarm system, which statement is true? See illustration EL-0248.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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