Delta Electronics DVP15MC11T, Руководство по эксплуатации

Страница: 224 / 601

Chapter 8 Logic Instructions
8_

The rule that Bit-string data are converted into Boolean data is as the following table shows.
Data type The value of In corresponds to the value of Out
In Out In Out
BYTE BOOL
16#00 FALSE
16#01~16#FF TRUE
WORD BOOL
16#0000 FALSE
16#0001~16#FFFF TRUE
DWORD BOOL
16#0000_0000 FALSE
16#0000_0001~16#FFFF_FFFF TRUE
LWORD BOOL
16#0000_0000_0000_0000 FALSE
16#0000_0000_0000_0001~
16#FFFF_FFFF_FFFF_FFFF
TRUE

Bit string to Bit string

Bit-string data can be converted to Bit-string data. And some instructions are shown below.
There are two kinds of conversion for different types of bit-string data. One is the conversion of
the less-length data to the greater-length data. The other is the conversion of the greater-length
data to the less-length data.
The less-length data is converted to the greater-length data by writing the values of all bits of
the less-length data to corresponding bits of the greater-length data and setting the values of
the remaining bits of the greater-length data to 0.
See the following example that the Byte data in In is converted to the Word data in Out . The
values of Bit0~Bit7 of In are copied and pasted to Bit0~Bit7 of Out . And the values of Bit8~Bit15
of Out are set to 0.
The greater-length data are converted to the less-length data by revising the values of all bits of
the less-length data into the values of the corresponding bits of the greater-length data and the
values of the remaining bits of the greater-length data are not converted and have no impact on
the conversion.
See the following example that the Word data In is converted to the Byte data Out . The values
of Bit0~Bit7 of In are copied and pasted to Bit0~Bit7 of Out . And the values of Bit8~Bit15 of In
are not converted and have no impact on the conversion.
B YTE_TO_WO RD
EN ENO
Out
In
WORD_TO _BY TE
EN ENO
Out
In
DWO RD_TO _WORD
EN E NO
Out In
LWORD_TO_B YTE
EN E NO
Out In
BY TE _TO _WORD
EN ENO
Out In
1 0 1 0 1 1 0 1
0 0 0 0 0 0 0 0
Bit0 Bit7
In
O ut
Fi ll
0
The less -lengt h dat a are conv ert ed
to the gre ater-lengt h dat a
1 0 1 0 1 1 0 1
Bit 8 B it 15
B YTE
WO RD
8-153