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

Question 1 / 270705eccefa5bacbc34ba4d486e1

Question 1 of 270705eccefa5bacbc34ba4d486e1

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 27070

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

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

🔍 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.

Question 1 of 27070

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

When the counted pulses at CD decrement from the preset value at PV to zero.

When the counted pulses at CD increment from zero to the preset value at PV.

When the counted pulses at LD decrement from the preset value at PV to zero.

When the counted pulses at LD increment from zero to the preset value at PV.

Question 1 / 270705eccefa5bacbc34ba4d486e1

Question 1 of 270705eccefa5bacbc34ba4d486e1

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 27070

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

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