Delta Electronics DVP15MC11T, Operation Manual

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DVP15MC11T Operation Manual
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
Function Explanation

The LEFT/RIGHT instruction extracts a specified-length string from the string In and the extracted
string is output to Out . The LEFT instruction extracts characters from the left of the string In and the
RIGHT instruction extracts characters from the right of the string. The way of extracting characters is
illustrated as below.

Precautions for Correct Use

The input variables are not allowed to omit. An error will occur during the compiling of the software if
the input variables are omitted. But the output variable is allowed to omit.

Programming Example

When the LEFT_In string is ’AaBbCcDd’, LEFT_L=2 and LEFT_EN is TRUE, Out1 is ’Aa’ as shown
in the following table 1. When the RIGHT_In string is ’AaBbCcDd’, RIGHT_L=2 and RIGHT_EN is
TRUE, Out1 is ’Dd’ as shown in the following table 2.

The variable table and program 1
Variable name Data type Current value
LEFT_EN BOOL TRUE
LEFT_In STRING ‘AaBbCcDd’
LEFT_L UINT
2
Out1 STRING ‘Aa’

The variable table and program 2
Variable name Data type Current value
RIGHT_EN BOOL
TRUE
RIGHT_In STRING ‘AaBbCcDd’
RIGHT_L UINT 2
Out1 STRING
‘Dd’
In =ABCDEFGH
LEFT
Out : ABCD ABCDEFGH
E xt ract 4 cha ract ers
f rom t he lef t of th e string
LEFT
L=4
Out : EFGH ABCDEFGH
Ext ract 4 ch aract ers
from t he righ t of the st ring
RIGHT RIGHT
1
L EFT
EN ENO
In Ou t
L EFT_E N
LEFT_ In O ut1
L LEFT_L
1
RIG HT
E N ENO
In O ut
RIG HT_ EN
RI GHT_In Out 1
L RIGHT_L
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