Delta Electronics DVP15MC11T, Руководство по эксплуатации

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Chapter 8 Logic Instructions
8_

Function Explanation

SHR is used to shift all bits of the value of In by the number of bits specified by Num to the right and
the result is output to Out .

When Num =2, all bits of the value of In are shifted by two bits to the right and Bit0~Bit1 of In are
discarded and the value of Bit6~Bit7 are supplemented with 0 as shown in the following figure.

Precautions for Correct Use

The input variables are not allowed to omit. An error will occur during the compiling of the software if
any input variable is omitted. But the output variable is allowed to omit.

When the value of Num is 0, the value of Out is the same as In .

Programming Example

The data types of SHR_In and SHR_Num are UINT and USINT respectively and their values are
300 and 3 respectively. The data type of Out1 is UINT and the value of Out1 is 37 when SHR_EN is
TRUE.

The variable table and program
Variable name Data type Current value
SHR_EN BOOL TRUE
SHR_In UINT 300
SHR_Num USINT 3
Out1 UINT 37

Illustration of the example
1 0 1 0 1 1 0 1
1 0 1 1 0 1 0 0
Bit0 B it 7
In
Out
Disc arded
Fill 0
Num= 2, shif ted by two bits to wa rd th e right
1
SHR
EN E NO
I n Out
SHR_EN
SHR_I n Ou t1
Num SHR_Num
0
1
0
1 1
0 0 0
1
B it 0 Bit 15
SHR_In
O ut1
3 bit s disc arded
SH R_ N um =3
,
shi fted by 3 bi ts right
1
0 0 0 0 0 0 0
0 1 0 0 0 0 0 0 0 0 1 0 0 0 0
0 fo r 3 supp le mentary bits
Bit0 B it 15
8-127