Programmed counters can:
A) count up.
B) count down.
C) be combined to count up and down.
D) all of these.
Correct Answer:
Verified
Q18: Counters are similar to timers,except that they
Q19: The counter enable bit is true whenever
Q20: The output of the counter is energized
Q21: Normally counters are retentive.This means that if
Q22: The PLC counter instruction is similar to
Q24: A PLC down-counter (CTD)counts:
A)scan transitions.
B)true-to-false transitions.
C)false-to-true transitions.
D)both
Q25: When the up-counter reset is set to
Q26: A counter is to be programmed to
Q27: The accumulated count of a CTD counter:
A)increments
Q28: A one-shot,or transitional,contact:
A)operates the same as an
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