State which one instruction (CTU, CTD, RTO, RES, TON, TOF) is best suited to eac

Question

State which one instruction (CTU, CTD, RTO, RES, TON, TOF) is best suited to each of the following situations. Each could be used more than once or not at all. 2. Could be used to count the number of objects leaving a process and activate an output when a value of 10 is reached. b.)Could be used to reset a counter instruction so that its accumulated value returns to zero. Could be used to reset a retentive timer instruction so that its accumulated value returns to zero. d.)Could be used with a CTU instruction to create an up-down counter Could be used to sound an alarm when a motor has been running for 8 hours, not necessarily all at once.

Explanation / Answer

1.CTU could be used to count the number of objects leaving a process and activate an output when a value of 10 is reached.

2.RES could be used to reset a counter instruction so that its accumalted value returns to zero.

3. RTO could be used to reset a retentive timer instruction so that its accumulated value returns to zero.

4. CTD along CTU used to create a UP DOWN counter.

5. TON could be used to sound an alaram when a motor has been running for 8 hours ,not neccesarily all at once.

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