DVP15MC11T Operation Manual
Case 3： When CTUD1_Load is TRUE and CTUD1_CV equals CTUD1_PV, CTUD1_QU changes
to TRUE and CTUD1_QD changes to FALSE. At the moment, if CTUD1_CD is triggered,
the instruction can not count down.
Case 4： If the instruction counts down normally, CTUD1_QU is FALSE when CTUD1_CD is TRUE.
The value of CTUD1_CV is decreased by 1 whenever CTUD1_CD is triggered once.
CTUD1_QD is TRUE when the value of CTUD1_CV is decreased to 0.
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