Delta Electronics DVP15MC11T Operation Manual page 122

Note:
The symbol ● indicates that the parameter is allowed to connect to the variable or constant of the data type.

Function Explanation
CTUD is used as an up counter for counting up and a down counter for counting down.

Precautions for Correct Use

The counter will not count down while Load is TRUE.

The counter will not count up while Reset is TRUE.

Programming Example

The variable table and program
Variable name
CTUD1
CTUD1_EN
CTUD1_CU
CTUD1_CD
CTUD1_Reset
CTUD1_Load
CTUD1_PV
CTUD1_QU
CTUD1_QD
CTUD1_CV

Timing Chart:
CTUD1_CU
CTUD1_ CD
CTUD1_Res et
CTUD1_ Load
CTUD1_ PV
CTUD1 _CV
CTUD1_QU
CTUD1_QD
Case 1： If CTUD counts up normally, the value of CTUD1_CV is increased by 1 whenever
CTUD1_CU is triggered once.
Case 2： When CTUD1_Reset is TRUE, CTUD1_CV is cleared to 0, CTUD1_QU changes to
FALSE and CTUD1_QD changes to TRUE.
Data type
CTUD1
CTUD
CTUD1_EN
EN
CTUD1_ CU CU
CTUD1_ CD CD
CTUD1_Res et Re set
CTUD1_ Load L oad
CTUD1 _PV P V
Cas e 1 Cas e 2
Chapter 8 Logic Instructions
CTUD
BOOL
BOOL
BOOL
BOOL
BOOL
UDINT
BOOL
BOOL
UDINT
1
E NO
CTUD1 _QU
Q U
CTUD1 _QD
Q D
CV CTUD1 _CV
Cas e 3 Cas e 4
Initial value
FALSE
FALSE
FALSE
FALSE
FALSE
4
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