注意
如果类型转换运算符的操作数值超出了目标数据类型的值范围，那么结果输出将取决于处理器类型，因此是未定义的。例如，当操作数负值从LREAL 转换为目标数据类型UINT 时，就会出现这种情况。
从较大的数据类型转换为较小的数据类型时，可能会丢失信息。
运算符将整数值转换为指定的数据类型，并返回转换后的值。如果要转换的数字超出范围限制，则数字的第一个字节将被忽略。
调用语法
<variable name> := <integer conversion type operator> ( <integer operand> ); <integer conversion type operator> = <integer data type> _TO_ <data type> <integer operand> = <variable name> | <literal> <integer data type> = __UXINT | __XINT | __XWORD | BIT | BYTE | DINT | DWORD | INT | LINT | LWORD | SINT | UDINT | UINT | ULINT | USINT | WORD
操作符
__UXINT_TO___XINT __UXINT_TO___XWORD __UXINT_TO_BIT __UXINT_TO_BOOL __UXINT_TO_BYTE __UXINT_TO_DATE __UXINT_TO_DINT __UXINT_TO_DT __UXINT_TO_DWORD __UXINT_TO_INT __UXINT_TO_LDATE __UXINT_TO_LDT __UXINT_TO_LINT __UXINT_TO_LREAL __UXINT_TO_LTIME __UXINT_TO_LTOD __UXINT_TO_LWORD __UXINT_TO_REAL __UXINT_TO_SINT __UXINT_TO_STRING __UXINT_TO_TIME __UXINT_TO_TOD __UXINT_TO_UDINT __UXINT_TO_UINT __UXINT_TO_ULINT __UXINT_TO_USINT __UXINT_TO_WORD __UXINT_TO_WSTRING __XINT_TO___UXINT __XINT_TO___XWORD __XINT_TO_BIT __XINT_TO_BOOL __XINT_TO_BYTE __XINT_TO_DATE __XINT_TO_DINT __XINT_TO_DT __XINT_TO_DWORD __XINT_TO_INT __XINT_TO_LDATE __XINT_TO_LDT __XINT_TO_LINT __XINT_TO_LREAL __XINT_TO_LTIME __XINT_TO_LTOD __XINT_TO_LWORD __XINT_TO_REAL __XINT_TO_SINT __XINT_TO_STRING __XINT_TO_TIME __XINT_TO_TOD __XINT_TO_UDINT __XINT_TO_UINT __XINT_TO_ULINT __XINT_TO_USINT __XINT_TO_WORD __XINT_TO_WSTRING __XWORD_TO_UXINT __XWORD_TO_XINT __XWORD_TO_BIT __XWORD_TO_BOOL __XWORD_TO_BYTE __XWORD_TO_DATE __XWORD_TO_DINT __XWORD_TO_DT __XWORD_TO_DWORD __XWORD_TO_INT __XWORD_TO_LDATE __XWORD_TO_LDT __XWORD_TO_LINT __XWORD_TO_LREAL __XWORD_TO_LTIME __XWORD_TO_LTOD __XWORD_TO_LWORD __XWORD_TO_REAL __XWORD_TO_SINT __XWORD_TO_STRING __XWORD_TO_TIME __XWORD_TO_TOD __XWORD_TO_UDINT __XWORD_TO_UINT __XWORD_TO_ULINT __XWORD_TO_USINT __XWORD_TO_WORD __XWORD_TO_WSTRING BIT_TO___UXINT BIT_TO___XINT BIT_TO___XWORD BIT_TO_BOOL BIT_TO_BYTE BIT_TO_DATE BIT_TO_DINT BIT_TO_DT BIT_TO_DWORD BIT_TO_INT BIT_TO_LDATE BIT_TO_LDT BIT_TO_LINT BIT_TO_LREAL BIT_TO_LTIME BIT_TO_LTOD BIT_TO_LWORD BIT_TO_REAL BIT_TO_SINT BIT_TO_STRING BIT_TO_TIME BIT_TO_TOD BIT_TO_UDINT BIT_TO_UINT BIT_TO_ULINT BIT_TO_USINT BIT_TO_WORD BIT_TO_WSTRING BYTE_TO___UXINT BYTE_TO___XINT BYTE_TO___XWORD BYTE_TO_BOOL BYTE_TO_BIT BYTE_TO_DATE BYTE_TO_DINT BYTE_TO_DT BYTE_TO_DWORD BYTE_TO_INT BYTE_TO_LDATE BYTE_TO_LDT BYTE_TO_LINT BYTE_TO_LREAL BYTE_TO_LTIME BYTE_TO_LTOD BYTE_TO_LWORD BYTE_TO_REAL BYTE_TO_SINT BYTE_TO_STRING BYTE_TO_TIME BYTE_TO_TOD BYTE_TO_UDINT BYTE_TO_UINT BYTE_TO_ULINT BYTE_TO_USINT BYTE_TO_WORD BYTE_TO_WSTRING DINT_TO___UXINT DINT_TO___XINT DINT_TO___XWORD DINT_TO_BOOL DINT_TO_BIT DINT_TO_BYTE DINT_TO_DATE DINT_TO_DT DINT_TO_DWORD DINT_TO_INT DINT_TO_LDATE DINT_TO_LDT DINT_TO_LINT DINT_TO_LREAL DINT_TO_LTIME DINT_TO_LTOD DINT_TO_LWORD DINT_TO_REAL DINT_TO_SINT DINT_TO_STRING DINT_TO_TIME DINT_TO_TOD DINT_TO_UDINT DINT_TO_UINT DINT_TO_ULINT DINT_TO_USINT DINT_TO_WORD DINT_TO_WSTRING DWORD_TO___UXINT DWORD_TO___XINT DWORD_TO___XWORD DWORD_TO_BIT DWORD_TO_BOOL DWORD_TO_BYTE DWORD_TO_DATE DWORD_TO_DINT DWORD_TO_DT DWORD_TO_INT DWORD_TO_LDATE DWORD_TO_LDT DWORD_TO_LINT DWORD_TO_LREAL DWORD_TO_LTIME DWORD_TO_LTOD DWORD_TO_LWORD DWORD_TO_REAL DWORD_TO_SINT DWORD_TO_STRING DWORD_TO_TIME DWORD_TO_TOD DWORD_TO_UDINT DWORD_TO_UINT DWORD_TO_ULINT DWORD_TO_USINT DWORD_TO_WORD DWORD_TO_WSTRING INT_TO___UXINT INT_TO___XINT INT_TO___XWORD INT_TO_BIT INT_TO_BOOL INT_TO_BYTE INT_TO_DATE INT_TO_DINT INT_TO_DT INT_TO_DWORD INT_TO_LDATE INT_TO_LDT INT_TO_LINT INT_TO_LREAL INT_TO_LTIME INT_TO_LTOD INT_TO_LWORD INT_TO_REAL INT_TO_SINT INT_TO_STRING INT_TO_TIME INT_TO_TOD INT_TO_UDINT INT_TO_UINT INT_TO_ULINT INT_TO_USINT INT_TO_WORD INT_TO_WSTRING LINT_TO___UXINT LINT_TO___XINT LINT_TO___XWORD LINT_TO_BIT LINT_TO_BOOL LINT_TO_BYTE LINT_TO_DATE LINT_TO_DINT LINT_TO_DT LINT_TO_DWORD LINT_TO_INT LINT_TO_LDATE LINT_TO_LDT LINT_TO_LREAL LINT_TO_LTIME LINT_TO_LTOD LINT_TO_LWORD LINT_TO_REAL LINT_TO_SINT LINT_TO_STRING LINT_TO_TIME LINT_TO_TOD LINT_TO_UDINT LINT_TO_UINT LINT_TO_ULINT LINT_TO_USINT LINT_TO_WORD LINT_TO_WSTRING LWORD_TO___UXINT LWORD_TO___XINT LWORD_TO___XWORD LWORD_TO_BIT LWORD_TO_BOOL LWORD_TO_BYTE LWORD_TO_DATE LWORD_TO_DINT LWORD_TO_DT LWORD_TO_DWORD LWORD_TO_INT LWORD_TO_LDATE LWORD_TO_LDT LWORD_TO_LINT LWORD_TO_LREAL LWORD_TO_LTIME LWORD_TO_LTOD LWORD_TO_REAL LWORD_TO_SINT LWORD_TO_STRING LWORD_TO_TIME LWORD_TO_TOD LWORD_TO_UDINT LWORD_TO_UINT LWORD_TO_ULINT LWORD_TO_USINT LWORD_TO_WORD LWORD_TO_WSTRING SINT_TO___UXINT SINT_TO___XINT SINT_TO___XWORD SINT_TO_BIT SINT_TO_BOOL SINT_TO_BYTE SINT_TO_DATE SINT_TO_DINT SINT_TO_DT SINT_TO_DWORD SINT_TO_INT SINT_TO_LDATE SINT_TO_LDT SINT_TO_LINT SINT_TO_LREAL SINT_TO_LTIME SINT_TO_LTOD SINT_TO_LWORD SINT_TO_REAL SINT_TO_STRING SINT_TO_TIME SINT_TO_TOD SINT_TO_UDINT SINT_TO_UINT SINT_TO_ULINT SINT_TO_USINT SINT_TO_WORD SINT_TO_WSTRING UDINT_TO___UXINT UDINT_TO___XINT UDINT_TO___XWORD UDINT_TO_BIT UDINT_TO_BOOL UDINT_TO_BYTE UDINT_TO_DATE UDINT_TO_DINT UDINT_TO_DT UDINT_TO_DWORD UDINT_TO_INT UDINT_TO_LDATE UDINT_TO_LDT UDINT_TO_LINT UDINT_TO_LREAL UDINT_TO_LTIME UDINT_TO_LTOD UDINT_TO_LWORD UDINT_TO_REAL UDINT_TO_SINT UDINT_TO_STRING UDINT_TO_TIME UDINT_TO_TOD UDINT_TO_UINT UDINT_TO_ULINT UDINT_TO_USINT UDINT_TO_WORD UDINT_TO_WSTRING UINT_TO___UXINT UINT_TO___XINT UINT_TO___XWORD UINT_TO_BIT UINT_TO_BOOL UINT_TO_BYTE UINT_TO_DATE UINT_TO_DINT UINT_TO_DT UINT_TO_DWORD UINT_TO_INT UINT_TO_LDATE UINT_TO_LDT UINT_TO_LINT UINT_TO_LREAL UINT_TO_LTIME UINT_TO_LTOD UINT_TO_LWORD UINT_TO_REAL UINT_TO_SINT UINT_TO_STRING UINT_TO_TIME UINT_TO_TOD UINT_TO_UDINT UINT_TO_ULINT UINT_TO_USINT UINT_TO_WORD UINT_TO_WSTRING ULINT_TO___UXINT ULINT_TO___XINT ULINT_TO___XWORD ULINT_TO_BIT ULINT_TO_BOOL ULINT_TO_BYTE ULINT_TO_DATE ULINT_TO_DINT ULINT_TO_DT ULINT_TO_DWORD ULINT_TO_INT ULINT_TO_LDATE ULINT_TO_LDT ULINT_TO_LINT ULINT_TO_LREAL ULINT_TO_LTIME ULINT_TO_LTOD ULINT_TO_LWORD ULINT_TO_REAL ULINT_TO_SINT ULINT_TO_STRING ULINT_TO_TIME ULINT_TO_TOD ULINT_TO_UDINT ULINT_TO_UINT ULINT_TO_USINT ULINT_TO_WORD ULINT_TO_WSTRING USINT_TO___XINT USINT_TO___XINT USINT_TO___XWORD USINT_TO_BIT USINT_TO_BOOL USINT_TO_BYTE USINT_TO_DATE USINT_TO_DINT USINT_TO_DT USINT_TO_DWORD USINT_TO_INT USINT_TO_LDATE USINT_TO_LDT USINT_TO_LINT USINT_TO_LREAL USINT_TO_LTIME USINT_TO_LTOD USINT_TO_LWORD USINT_TO_REAL USINT_TO_SINT USINT_TO_STRING USINT_TO_TIME USINT_TO_TOD USINT_TO_UDINT USINT_TO_UINT USINT_TO_ULINT USINT_TO_WORD USINT_TO_WSTRING WORD_TO___XINT WORD_TO___XINT WORD_TO___XWORD WORD_TO_BIT WORD_TO_BOOL WORD_TO_BYTE WORD_TO_DATE WORD_TO_DINT WORD_TO_DT WORD_TO_DWORD WORD_TO_INT WORD_TO_LDATE WORD_TO_LDT WORD_TO_LINT WORD_TO_LREAL WORD_TO_LTIME WORD_TO_LTOD WORD_TO_LWORD WORD_TO_REAL WORD_TO_SINT WORD_TO_STRING WORD_TO_TIME WORD_TO_TOD WORD_TO_UDINT WORD_TO_UINT WORD_TO_ULINT WORD_TO_USINT WORD_TO_WSTRING
转换为字符串
注意
转换为STRING 或 WSTRING
在将类型转换为STRING 或WSTRING 时，键入的值将作为字符串左对齐，如果太长则截断。因此，要为类型转换运算符<>_TO_STRING 和<>_TO_WSTRING 声明足够长的返回变量，以便字符串在不进行任何操作的情况下有足够的空间。
将数值转换为STRING 或WSTRING 类型字符串的运算符要求操作数与目标数据类型相匹配。
示例
示例
ST 实施语言
当较大的数据类型转换为较小的数据类型时，较多的高阶（前端）字节会被截断。当一个较小的数据类型转换成一个较大的数据类型时，较多的高阶字节会填充 0。
FUNCTION_BLOCK FB_ConvertIntegersFromInt
VAR_INPUT
END_VAR
VAR_OUTPUT
END_VAR
VAR
uxiReturn: __UXINT;
xiReturn: __XINT;
xwReturn: __XWORD;
bitReturn: BIT;
xReturn: BOOL;
bReturn: BYTE;
dateReturn: DATE;
diReturn: DINT;
dtReturn: DATE_AND_TIME;
dwReturn: DWORD;
liReturn: LINT;
lrReturn: LREAL;
lwReturn: LWORD;
siReturn: SINT;
sReturn: STRING;
timReturn: TIME;
todReturn: TIME_OF_DAY;
udiReturn: UDINT;
uiReturn: UINT;
usiReturn: USINT;
wReturn: WORD;
wsReturn: WSTRING;
uliReturn: ULINT;
END_VAR
uxiReturn := INT_TO___UXINT(127);
xiReturn := INT_TO___XINT(127);
xwReturn := INT_TO___XWORD(127);
bitReturn := INT_TO_BIT(127);
xReturn := INT_TO_BOOL(127);
bReturn := INT_TO_BYTE(127);
dateReturn := INT_TO_DATE(127);
diReturn := INT_TO_DINT(127);
dtReturn := INT_TO_DT(127);
dwReturn := INT_TO_DWORD(127);
liReturn := INT_TO_LINT(127);
lrReturn := INT_TO_LREAL(127);
lwReturn := INT_TO_LWORD(127);
siReturn := INT_TO_SINT(127);
sReturn := INT_TO_STRING(127);
timReturn := INT_TO_TIME(127);
todReturn := INT_TO_TOD(127);
udiReturn := INT_TO_UDINT(127);
uiReturn := INT_TO_UINT(127);
uliReturn := INT_TO_ULINT(127);
usiReturn := INT_TO_USINT(127);
wReturn := INT_TO_WORD(127);
wsReturn := INT_TO_WSTRING(127);
FUNCTION_BLOCK FB_ConvertIntegersToInt
VAR_INPUT
END_VAR
VAR_OUTPUT
END_VAR
VAR
iReturn_uxi: INT;
iReturn_xi: INT;
iReturn_xw: INT;
iReturn_bit: INT;
iReturn_bool: INT;
iReturn_b: INT;
iReturn_d: INT;
iReturn_di: INT;
iReturn_dt: INT;
iReturn_dw: INT;
iReturn_li: INT;
iReturn_lr: INT;
iReturn_lw: INT;
iReturn_r: INT;
iReturn_si: INT;
iReturn_s: INT;
iReturn_tim: INT;
iReturn_tod: INT;
iReturn_tod_0: INT;
iReturn_udi: INT;
iReturn_ui: INT;
iReturn_uli: INT;
iReturn_usi: INT;
iReturn_w: INT;
iReturn_ws: INT;
END_VAR
iReturn_uxi := __UXINT_TO_INT(18446744073709551615);
iReturn_xi := __XINT_TO_INT(9223372036854775807);
iReturn_xw := __XWORD_TO_INT(16#FFFF_FFFF_FFFF_FFFF);
iReturn_bit := BIT_TO_INT(1);
iReturn_bool := BOOL_TO_INT(TRUE);
iReturn_b := BYTE_TO_INT(2#1111_0000);
iReturn_d := DATE_TO_INT(DATE#2019-9-13);
iReturn_di := DINT_TO_INT(2147483647);
iReturn_dt := DT_TO_INT(DT#1979-1-1-00:00:00);
iReturn_dw := DWORD_TO_INT(16#FFFF_FFFF);
// iReturn_i := INT_TO_<>(iData_12);
iReturn_li := LINT_TO_INT(9223372036854775807);
iReturn_lr := LREAL_TO_INT(1.7976931348623157E+30);
iReturn_lw := LWORD_TO_INT(16#FFFF_FFFF_FFFF_FFFF);
iReturn_r := REAL_TO_INT(3.402823E+38);
iReturn_si := SINT_TO_INT(127);
iReturn_s := STRING_TO_INT('127');
iReturn_tim := TIME_TO_INT(T#49D17H2M47S295MS);
iReturn_tod := TOD_TO_INT(TOD#23:59:59.999);
iReturn_tod_0 := TOD_TO_INT(TOD#1:1:1.001);
iReturn_udi := UDINT_TO_INT(4294967295);
iReturn_ui := UINT_TO_INT(65535);
iReturn_uli := ULINT_TO_INT(18446744073709551615);
iReturn_usi := USINT_TO_INT(255);
iReturn_w := WORD_TO_INT(16#FFFF);
iReturn_ws := WSTRING_TO_INT("1234567890");
PROGRAM PLC_PRG
VAR
fbConvertIntegersFromInt : FB_ConvertIntegersFromInt;
fbConvertIntegersToInt : FB_ConvertIntegersToInt;
END_VAR
fbConvertIntegersFromInt();
fbConvertIntegersToInt();
FBD 执行语言
