The counter enable bit is true whenever the counter instruction is false.
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Q14: PLC counters are normally nonretentive.
Q15: A transitional off-to-on contact will allow logic
Q16: All PLC manufacturers require the reset rung
Q17: The counter number C5:4 represents counter file
Q18: Counters are similar to timers,except that they
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
Q23: Programmed counters can:
A)count up.
B)count down.
C)be combined to
Q24: A PLC down-counter (CTD)counts:
A)scan transitions.
B)true-to-false transitions.
C)false-to-true transitions.
D)both
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