Delta Electronics DVP15MC11T, Operation Manual

Page: 118 / 601

Chapter 8 Logic Instructions
8_

Precautions for Correct Use

While Reset is TRUE, the counter will not count up.

When CV equals PV, the counter stops counting.

Programming Example

The variable table and program
Variable name Data type Initial value
CTU1 CTU
CTU1_EN BOOL FALSE
CTU1_CU BOOL FALSE
CTU1_Reset BOOL FALSE
CTU1_PV UDINT 4
CTU1_Q BOOL
CTU1_CV UDINT

Timing Chart:
Case 1
：
If CTU counts up normally, the value of CTU1_CV is increased by 1 whenever
CTU1_CU is triggered once.
Case 2
：
When CTU1_CV equals CTU1_PV, CTU1_Q is TRUE and CTU stops counting.
Case 3
：
When CTU1_Reset is TRUE, CTU1_CV is cleared to 0, CTU1_Q is FALSE. And the
counter will not count when CTU1_CU is triggered.
1
CTU
EN E NO
Q
CTU1
CU
Reset
CV
PV
CTU1_E N
CTU1 _CU
CTU1_Res et
CTU1_PV
CTU1_Q
CTU1_CV
CTU1_CU
CTU1_Res et
CTU1_CV
CTU1_ Q
CTU1 _PV
Cas e 1 Cas e 2 Cas e 3
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