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

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Question 1 of 205eccefa5bacbc34ba4d486e1

As shown in figure "B" of the illustration, what causes the Boolean output at "Q" to be set to 1? See illustration EL-0258.

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Question 1 of 20

5eccefa5bacbc34ba4d486e1

As shown in figure "B" of the illustration, what causes the Boolean output at "Q" to be set to 1? See illustration EL-0258.

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🔍 Key Concepts

• CTD (count-down) counter operation in IEC symbols • The role of the LD (load) input and PV (preset value) • When the Q output of a down-counter is energized (relationship between CV and zero)

💭 Think About

• From the symbol in figure B, is this block counting up or down when it receives pulses at CD? • What does the LD input do to the internal count value CV in relation to PV before counting starts? • For a standard IEC count-down counter, at what count value (CV) does Q change from 0 to 1?

✅ Before You Answer

• Verify which input (CD vs LD) is actually used for the repeated counting pulses. • Confirm that LD is used to load the preset PV into the counter, not to perform the ongoing count. • Make sure you know whether Q goes true when CV reaches 0 or when CV reaches the preset value PV.

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Question 1 of 205eccefa5bacbc34ba4d486e1

As shown in figure "B" of the illustration, what causes the Boolean output at "Q" to be set to 1? See illustration EL-0258.

Back

Question 1 of 20

5eccefa5bacbc34ba4d486e1

As shown in figure "B" of the illustration, what causes the Boolean output at "Q" to be set to 1? See illustration EL-0258.

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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