创建新连接外部变量只能在与自动化系统连接的基础上创建。如果还没有需要的连接，必须首先创建该连接。先决条件必须安装所需要的通讯处理器和相关的硬件驱动程序。还必须安装期望的通讯驱动程序，例如“SIMATIC S7 Protocol Suite”步骤
步骤
1 扩展“变量管理”中通讯驱动程序的视图。
2 选择期望的通道单元，例如“PROFIBUS”。
3 在用于通道单元的弹出式菜单中，选择“新建驱动程序连接…”。
4 在“常规”标签卡的“名称”域中，输入在项目范围内唯一的用于连接的名称。
5 单击“属性”按钮，打开“连接参数”对话框。设置该连接所需的参数。有关详细信息，请参考各相应通道的帮助文档。
6 通过单击“确定”，关闭所有的对话框。
组态外部变量创建变量的过程对于所有数据类型基本相似。然而，对某些数据类型进行特殊设置。(步骤5 – 7)。先决条件必须安装所需要的通讯处理器和硬件驱动程序。还必须安装期望的通讯驱动程序，例如“SIMATIC S7 Protocol Suite”。为了使用通道单元，必须建立连接(例如“PROFIBUS”)。步骤
步骤
1 从所期望的连接的弹出式菜单中选择“新建变量”。“变量属性”对话框将打开。
2 在“常规”标签卡上，“名称”域中，输入在WinCC项目范围内唯一的变量名，例如“WinCCTag_01”。
3 设置变量的“数据类型”，例如 “浮点数64位IEEE 754”，在相关域中。
4 单击“选择”打开“变量属性”对话框，在AS中设置变量的地址区域。
在二进制或8位变量的情况下，如果通道不支持按位/字节访问，在“变量属性”对话框前会显示“位/字节变量”对话框。
要获得更多信息，请参考“BinWrite机制”。单击“确定”按钮，关闭“位/字节变量”或“变量属性”对话框。
5 在数字变量的情况下，WinCC会在“类型转换”域中显示建议的类型转换。
按照不同需要，选择合适的的类型转换。转换以“X到Y”的次序显示，(www.dqjsw.com.cn)X是WinCC格式、Y是AS格式，例如“DoubleToDouble”。
6 单击“线性标定”复选框使数字标签线性标定。输入“过程值范围”(在AS中)以及“变量数值范围”(在WinCC中)的上限和下限。
7 当使用文本变量工作，将激活“长度”域。在这种情况下，以字符形式输入文本变量的长度。
8 单击“确定”关闭所有对话框。
WinCC数据类型排序的类型转换当组态外部变量，必须对所有数字型数据类型执行类型转换。WinCC这方面的数据格式决定了数据类型。类型转换定义如何从WinCC格式转换到AS格式。该定义适用于双向传送。从列表中选择期望的WinCC数据类型。下表列出所支持的类型转换和数值范围。WinCC数据类型窗体顶部 类型转换“无符号8位数” 数值范围
ByteToUnsignedByte 0…255 (无转换)
ByteToUnsignedWord 0…255
ByteToUnsignedDword 0…255
ByteToSignedByte 0…127
ByteToSignedWord 0…255
ByteToSignedDword 0…255
ByteToBCDByte 0…99
ByteToBCDWord 0…255
ByteToBCDDword 0…255
ByteToAikenByte 0…99
ByteToAikenWord 0…255
ByteToAikenDword 0…255
ByteToExcessByte 0…99
ByteToExcessWord 0…255
ByteToExcessDword 0…255
“有符号8位数”类型转换 数值范围
CharToUnsignedByte 0…127
CharToUnsignedWord 0…127
CharToUnsignedDword 0…127
CharToSignedByte -128…+127 (无转换)
CharToSignedWord -128…+127
CharToSignedDword -128…+127
CharToMSBByte -128…+127
CharToMSBWord -128…+127
CharToMSBDword -128…+127
CharToBCDByte 0…99
CharToBCDWord 0…127
CharToBCDDword 0…127
CharToSignedBCDByte -9…+9
CharToSignedBCDWord -128…+127
CharToSignedBCDDword -128…+127
CharToExtSignedBCDByte -79…+79
CharToExtSignedBCDWord -128…+127
CharToExtSignedBCDDword -128…+127
CharToAikenByte 0…99
CharToAikenWord 0…127
CharToAikenDword 0…127
CharToSignedAikenByte -9…+9
CharToSignedAikenWord -128…+127
CharToSignedAikenDword -128…+127
CharToExcessByte 0…99
CharToExcessWord 0…127
CharToExcessDword 0…127
CharToSignedExcessByte -9…+9
CharToSignedExcessWord -128…+127
CharToSignedExcessDword -128…+127
“浮点数64位IEEE 754”类型转换 数值范围
DoubleToDouble +-1.79769313486231e+308 (无转换)
DoubleToUnsignedByte 0…255
DoubleToUnsignedWord 0…65535
DoubleToUnsignedDword 0…4294967295
DoubleToSignedByte -128…+127
DoubleToSignedWord -32768…+32767
DoubleToSignedDword -2147483647…+2147483647
DoubleToFloat +-3.402823e+38
DoubleToMSBByte -127…+127
DoubleToMSBWord -32767…+32767
DoubleToMSBDword -2147483647…+2147483647
DoubleToBCDByte 0…99
DoubleToBCDWord 0…9999
DoubleToBCDDword 0…99999999
DoubleToSignedBCDByte -9…+9
DoubleToSignedBCDWord -999…+999
DoubleToSignedBCDDword -9999999…+9999999
DoubleToExtSignedBCDByte -79…+79
DoubleToExtSignedBCDWord -7999…+7999
DoubleToExtSignedBCDDword -79999999…+79999999
DoubleToAikenByte 0…99
DoubleToAikenWord 0…9999
DoubleToAikenDword 0…99999999
DoubleToSignedAikenByte -9…+9
DoubleToSignedAikenWord -999…+999
DoubleToSignedAikenDword -9999999…+9999999
DoubleToExcessByte 0…99
DoubleToExcessWord 0…9999
DoubleToExcessDword 0…99999999
DoubleToSignedExcessByte -9…+9
DoubleToSignedExcessWord -999…+999
DoubleToSignedExcessDword -9999999…+9999999
DoubleToS5Timer 10…9990000
DoubleToS5Float +-1.701411e+38
“无符号32位数”类型转换 数值范围
DwordToUnsignedDword 0…4294967295 (无转换)
DwordToUnsignedByte 0…255
DwordToUnsignedWord 0…65535
DwordToSignedByte 0…127
DwordToSignedWord 0…32767
DwordToSignedDword 0…2147483647
DwordToBCDByte 0…99
DwordToBCDWord 0…9999
DwordToBCDDword 0…99999999
DwordToAikenByte 0…99
DwordToAikenWord 0…9999
DwordToAikenDword 0…99999999
DwordToExcessByte 0…99
DwordToExcessWord 0…9999
DwordToExcessDword 0…99999999
DwordToSimaticTimer 10…9990000
DwordToSimaticBCDTimer 10…9990000
“浮点数32位IEEE 754”类型转换 数值范围
FloatToFloat +-3.402823e+38 (无转换)
FloatToUnsignedByte 0…255
FloatToUnsignedWord 0…65535
FloatToUnsignedDword 0…4.294967e+09
FloatToSignedByte -128…+127
FloatToSignedWord -32768…+32767
FloatToSignedDword -2.147483e+09…+2.147483e+09
FloatToDouble +-3.402823e+38
FloatToMSBByte -127…+127
FloatToMSBWord -32767…+32767
FloatToMSBDword -2.147483e+09…+2.147483e+09
FloatToBCDByte 0…99
FloatToBCDWord 0…9999
FloatToBCDDword 0…9.999999e+07
FloatToSignedBCDByte -9…+9
FloatToSignedBCDWord -999…+999
FloatToSignedBCDDword -9999999…+9999999
FloatToExtSignedBCDByte -79…+79
FloatToExtSignedBCDWord -7999…+7999
FloatToExtSignedBCDDword -7.999999e+07…+7.999999e+07
FloatToAikenByte 0…99
FloatToAikenWord 0…9999
FloatToAikenDword 0…9.999999e+07
FloatToSignedAikenByte -9…+9
FloatToSignedAikenWord -999…+999
FloatToSignedAikenDword -9999999…+9999999
FloatToExcessByte 0…99
FloatToExcessWord 0…9999
FloatToExcessDword 0…9.999999e+07
FloatToSignedExcessByte -9…+9
FloatToSignedExcessWord -999…+999
FloatToSignedExcessDword -9999999…+9999999
FloatToS5Timer 10…9990000
FloatToS5Float +-1.701411e+38
“有符号32位数”类型转换 数值范围
LongToSignedDword -2147483647…+2147483647 (无转换)
LongToUnsignedByte 0…255
LongToUnsignedWord 0…65535
LongToUnsignedDword 0…2147483647
LongToSignedByte -128…+127
LongToSignedWord -32768…+32767
LongToMSBByte -127…+127#p#分页标题#e#
LongToMSBWord -32767…+32767
LongToMSBDword -2147483647…+2147483647
LongToBCDByte 0…99
LongToBCDWord 0…9999
LongToBCDDword 0…99999999
LongToSignedBCDByte -9…+9
LongToSignedBCDWord -999…+999
LongToSignedBCDDword -9999999…+9999999
LongToExtSignedBCDByte -79..+79
LongToExtSignedBCDWord -7999…+7999
LongToExtSignedBCDDword -79999999…+79999999
LongToAikenByte 0…99
LongToAikenWord 0…9999
LongToAikenDword 0…99999999
LongToSignedAikenByte -9…+9
LongToSignedAikenWord -999…+999
LongToSignedAikenDword -9999999…+9999999
LongToExcessByte 0…99
LongToExcessWord 0…9999
LongToExcessDword 0…99999999
LongToSignedExcessByte -9…+9
LongToSignedExcessWord -999…+999
LongToSignedExcessDword -9999999…+9999999
LongToSimaticTimer 10…9990000
LongToSimaticBCDTimer 10…9990000
“有符号16位数”类型转换 数值范围
ShortToUnsignedByte 0…255
ShortToUnsignedWord 0…32767
ShortToUnsignedDword 0…32767
ShortToSignedByte -128…+127
ShortToSignedWord -32768…+32767 (无转换)
ShortToSignedDword -32768…+32767
ShortToMSBByte -127…+127
ShortToMSBWord -32767…+32767
ShortToMSBDword -32768…+32767
ShortToBCDByte 0…99
ShortToBCDWord 0…9999
ShortToBCDDword 0…32767
ShortToSignedBCDByte -9…+9
ShortToSignedBCDWord -999…+999
ShortToSignedBCDDword -32768…+32767
ShortToExtSignedBCDByte -79…+79
ShortToExtSignedBCDWord -7999…+7999
ShortToExtSignedBCDDword -32768…+32767
ShortToAikenByte 0…99
ShortToAikenWord 0…9999
ShortToAikenDword 0…32767
ShortToSignedAikenByte -9…+9
ShortToSignedAikenWord -999…+999
ShortToSignedAikenDword -32768…+32767
ShortToExcessByte 0…99
ShortToExcessWord 0…9999
ShortToExcessDword 0…32767
ShortToSignedExcessByte -9…+9
ShortToSignedExcessWord -999…+999
ShortToSignedExcessDword -32768…+32767
“无符号16位数”类型转换 数值范围
WordToUnsignedWord 0…65535 (无转换)
WordToUnsignedByte 0…255
WordToUnsignedDword 0…65535
WordToSignedByte 0…127
WordToSignedWord 0…32767
WordToSignedDword 0…65535
WordToBCDByte 0…99
WordToBCDWord 0…9999
WordToBCDDword 0…65535
WordToAikenByte 0…99
WordToAikenWord 0…9999
WordToAikenDword 0…65535
WordToExcessByte 0…99
WordToExcessWord 0…9999
WordToExcessDword 0…65535
WordToSimaticCounter 0…999
WordToSimaticBCDCounter 0…999
按AS数据类型排序的类型转换引言在组态外部变量时，必须对所有数字型数据类型执行类型转换。WinCC这方面的数据格式决定了数据类型。类型转换定义如何从WinCC格式转换到AS格式。该定义适用于双向传送。从列表中选择期望的AS数据类型。下表列出所支持的类型转换和数值范围。AS数据类型窗体顶部 所有 AikenByte AikenDword AikenWord BCDByte BCDDword BCDWord Double ExcessByte ExcessDword ExcessWord ExtSignedBCDByte ExtSignedBCDDword ExtSignedBCDWord Float MSBByte MSBDword MSBWord S5Float S5Timer SignedAikenByte SignedAikenDword SignedAikenWord SignedBCDByte SignedBCDDword SignedBCDWord SignedByte SignedDword SignedExcessByte SignedExcessDword SignedExcessWord SignedWord SimaticBCDCounter SimaticBCDTimer SimaticCounter SimaticTimer UnsignedByte UnsignedDword UnsignedWord窗体底部数据类型和数值范围 “无符号字节”类型转换 数值范围
ByteToUnsignedByte 0…255 (无转换)
CharToUnsignedByte 0…127
DoubleToUnsignedByte 0…255
DwordToUnsignedByte 0…255
FloatToUnsignedByte 0…255
LongToUnsignedByte 0…255
ShortToUnsignedByte 0…255
WordToUnsignedByte 0…255
“无符号字”类型转换 数值范围
ByteToUnsignedWord 0…255
CharToUnsignedWord 0…127
DoubleToUnsignedWord 0…65535
DwordToUnsignedWord 0…65535
FloatToUnsignedWord 0…65535
LongToUnsignedWord 0…65535
ShortToUnsignedWord 0…32767
WordToUnsignedWord 0…65535 (无转换)
“无符号双字”类型转换 数值范围
ByteToUnsignedDword 0…255
CharToUnsignedDword 0…127
DoubleToUnsignedDword 0…4294967295
DwordToUnsignedDword 0…4294967295 (无转换)
FloatToUnsignedDword 0…4.294967e+09
LongToUnsignedDword 0…2147483647
ShortToUnsignedDword 0…32767
WordToUnsignedDword 0…65535
“有符号字节”类型转换 数值范围
ByteToSignedByte 0…127
CharToSignedByte -128…+127 (无转换)
DoubleToSignedByte -128…+127
DwordToSignedByte 0…127
FloatToSignedByte -128…+127
LongToSignedByte -128…+127
ShortToSignedByte -128…+127
WordToSignedByte 0…127
“有符号字”类型转换 数值范围
ByteToSignedWord 0…255
CharToSignedWord -128…+127
DoubleToSignedWord -32768…+32767
DwordToSignedWord 0…32767
FloatToSignedWord -32768…+32767
LongToSignedWord -32768…+32767
ShortToSignedWord -32768…+32767 (无转换)
WordToSignedWord 0…32767
“有符号双字”类型转换 数值范围
ByteToSignedDword 0…255
CharToSignedDword -128…+127
DoubleToSignedDword -2147483647…+2147483647
DwordToSignedDword 0…2147483647
FloatToSignedDword -2.147483e+09…+2.147483e+09
LongToSignedDword -2147483647…+2147483647 (无转换)
ShortToSignedDword -32768…+32767
WordToSignedDword 0…65535
“MSBByte”类型转换 数值范围
CharToMSBByte -128…+127
DoubleToMSBByte -127…+127
FloatToMSBByte -127…+127
LongToMSBByte -127…+127
ShortToMSBByte -127…+127
“MSBWord”类型转换 数值范围
CharToMSBWord -128…+127
DoubleToMSBWord -32767…+32767
FloatToMSBWord -32767…+32767
LongToMSBWord -32767…+32767
ShortToMSBWord -32767…+32767
“MSBDWord”类型转换 数值范围
CharToMSBDword -128…+127
DoubleToMSBDword -2147483647…+2147483647
FloatToMSBDword -2.147483e+09…+2.147483e+09
LongToMSBDword -2147483647…+2147483647
ShortToMSBDword -32768…+32767
“BCDByte”类型转换 数值范围
ByteToBCDByte 0…99
CharToBCDByte 0…99
DoubleToBCDByte 0…99
DwordToBCDByte 0…99
FloatToBCDByte 0…99
LongToBCDByte 0…99
ShortToBCDByte 0…99
WordToBCDByte 0…99
“BCDWord”类型转换 数值范围
ByteToBCDWord 0…255
CharToBCDWord 0…127
DoubleToBCDWord 0…9999
DwordToBCDWord 0…9999
FloatToBCDWord 0…9999
LongToBCDWord 0…9999
ShortToBCDWord 0…9999
WordToBCDWord 0…9999
“BCDDWord”类型转换 数值范围
ByteToBCDDword 0…255
CharToBCDDword 0…127
DoubleToBCDDword 0…99999999
DwordToBCDDword 0…99999999
FloatToBCDDword 0…9.999999e+07
LongToBCDDword 0…99999999
ShortToBCDDword 0…32767
WordToBCDDword 0…65535
“SignedBCDByte”类型转换 数值范围
CharToSignedBCDByte -9…+9
DoubleToSignedBCDByte -9…+9
FloatToSignedBCDByte -9…+9
LongToSignedBCDByte -9…+9
ShortToSignedBCDByte -9…+9
“SignedBCDWord”类型转换 数值范围
CharToSignedBCDWord -128…+127
DoubleToSignedBCDWord -999…+999
FloatToSignedBCDWord -999…+999
LongToSignedBCDWord -999…+999
ShortToSignedBCDWord -999…+999
“SignedBCDDWord”类型转换 数值范围
CharToSignedBCDDword -128…+127
DoubleToSignedBCDDword -9999999…+9999999
FloatToSignedBCDDword -9999999…+9999999
LongToSignedBCDDword -9999999…+9999999
ShortToSignedBCDDword -32768…+32767#p#分页标题#e#
“ExtSignedBCDByte”类型转换 数值范围
CharToExtSignedBCDByte -79…+79
DoubleToExtSignedBCDByte -79…+79
FloatToExtSignedBCDByte -79…+79
LongToExtSignedBCDByte -79..+79
ShortToExtSignedBCDByte -79…+79
“ExtSignedBCDWord”类型转换 数值范围
CharToExtSignedBCDWord -128…+127
DoubleToExtSignedBCDWord -7999…+7999
FloatToExtSignedBCDWord -7999…+7999
LongToExtSignedBCDWord -7999…+7999
ShortToExtSignedBCDWord -7999…+7999
“ExtSignedBCDDWord”类型转换 数值范围
CharToExtSignedBCDDword -128…+127
DoubleToExtSignedBCDDword -79999999…+79999999
FloatToExtSignedBCDDword -7.999999e+07…+7.999999e+07
LongToExtSignedBCDDword -79999999…+79999999
ShortToExtSignedBCDDword -32768…+32767
“AikenByte”类型转换 数值范围
ByteToAikenByte 0…99
CharToAikenByte 0…99
DoubleToAikenByte 0…99
DwordToAikenByte 0…99
FloatToAikenByte 0…99
LongToAikenByte 0…99
ShortToAikenByte 0…99
WordToAikenByte 0…99
AikenWord” 数值范围
ByteToAikenWord 0…255
CharToAikenWord 0…127
DoubleToAikenWord 0…9999
DwordToAikenWord 0…9999
FloatToAikenWord 0…9999
LongToAikenWord 0…9999
ShortToAikenWord 0…9999
WordToAikenWord 0…9999
“AikenDWord”类型转换 数值范围
ByteToAikenDword 0…255
CharToAikenDword 0…127
DoubleToAikenDword 0…99999999
DwordToAikenDword 0…99999999
FloatToAikenDword 0…9.999999e+07
LongToAikenDword 0…99999999
ShortToAikenDword 0…32767
WordToAikenDword 0…65535
“SignedAikenByte”类型转换 数值范围
CharToSignedAikenByte -9…+9
DoubleToSignedAikenByte -9…+9
FloatToSignedAikenByte -9…+9
LongToSignedAikenByte -9…+9
ShortToSignedAikenByte -9…+9
“SignedAikenWord”类型转换 数值范围
CharToSignedAikenWord -128…+127
DoubleToSignedAikenWord -999…+999
FloatToSignedAikenWord -999…+999
LongToSignedAikenWord -999…+999
ShortToSignedAikenWord -999…+999
“SignedAikenDWord”类型转换 数值范围
CharToSignedAikenDword -128…+127
DoubleToSignedAikenDword -9999999…+9999999
FloatToSignedAikenDword -9999999…+9999999
LongToSignedAikenDword -9999999…+9999999
ShortToSignedAikenDword -32768…+32767
“ExcessByte”类型转换 数值范围
ByteToExcessByte 0…99
CharToExcessByte 0…99
DoubleToExcessByte 0…99
DwordToExcessByte 0…99
FloatToExcessByte 0…99
LongToExcessByte 0…99
ShortToExcessByte 0…99
WordToExcessByte 0…99
“ExcessWord”类型转换 数值范围
ByteToExcessWord 0…255
CharToExcessWord 0…127
DoubleToExcessWord 0…9999
DwordToExcessWord 0…9999
FloatToExcessWord 0…9999
LongToExcessWord 0…9999
ShortToExcessWord 0…9999
WordToExcessWord 0…9999
“ExcessDWord”类型转换 数值范围
ByteToExcessDword 0…255
CharToExcessDword 0…127
DoubleToExcessDword 0…99999999
DwordToExcessDword 0…99999999
FloatToExcessDword 0…9.999999e+07
LongToExcessDword 0…99999999
ShortToExcessDword 0…32767
WordToExcessDword 0…65535
“SignedExcessByte”类型转换 数值范围
CharToSignedExcessByte -9…+9
DoubleToSignedExcessByte -9…+9
FloatToSignedExcessByte -9…+9
LongToSignedExcessByte -9…+9
ShortToSignedExcessByte -9…+9
“SignedExcessWord”类型转换 数值范围
CharToSignedExcessWord -128…+127
DoubleToSignedExcessWord -999…+999
FloatToSignedExcessWord -999…+999
LongToSignedExcessWord -999…+999
ShortToSignedExcessWord -999…+999
“SignedExcessDWord”类型转换 数值范围
CharToSignedExcessDword -128…+127
DoubleToSignedExcessDword -9999999…+9999999
FloatToSignedExcessDword -9999999…+9999999
LongToSignedExcessDword -9999999…+9999999
ShortToSignedExcessDword -32768…+32767
“SimaticCounter”类型转换 数值范围
WordToSimaticCounter 0…999
“SimaticBCDCounter”类型转换 数值范围
WordToSimaticBCDCounter 0…999
“SimaticTimer”类型转换 数值范围
DwordToSimaticTimer 10…9990000
LongToSimaticTimer 10…9990000
“S5Float”类型转换 数值范围
DoubleToS5Float +-1.701411e+38
FloatToS5Float +-1.701411e+38
“S5Timer”类型转换 数值范围
DoubleToS5Timer 10…9990000
FloatToS5Timer 10…9990000
“SimaticBCDTimer”类型转换 数值范围
DwordToSimaticBCDTimer 10…9990000
LongToSimaticBCDTimer 10…9990000
“Double”类型转换 数值范围
DoubleToDouble +-1.79769313486231e+308 (无转换)
FloatToDouble +-3.402823e+38
“Float”类型转换 数值范围
DoubleToFloat +-3.402823e+38
FloatToFloat +-3.402823e+38 (无转换)
BinWrite机制引言在WinCC中，一些通讯驱动程序及其通道单元不支持直接按位或字节访问(位/字节访问)已连接的自动化系统中的地址区域。于是，他们使用BinWrite机制。位/字节访问用位/字节访问通讯驱动程序的通道单元可直接读写期望的位或字节。在以下说明中，位x的数值通过直接位/字节访问设置为1。BinWrite机制下列通讯驱动程序不支持位/字节访问，使用BinWrite机制代替通道单元：Modbus SerialSIMATIC S5 ETHERNET LAYER 4SIMATIC S5 Programmers Port AS511SIMATIC S5 Serial 3964RSIMATIC TI Ethernet Layer 4SIMATIC TI Serial为了写位或字节，通道单元使用BinWrite机制首先读取整个数据字。已编址的位或字节在已读取的字中改变。然后，整个字(！)而不只是修改过的位或字节会被写回内存。在以下说明中，位x的数值通过使用BinWrite机制设置为1。 注意如果AS中的字在WinCC使用BinWrite机制读取过后，进行了修改(参见说明中的“问题案例”)，则当WinCC把字写回内存时，会覆盖由AS改变的数据。用BinWrite组态变量如果想为不支持位/字节访问的通讯驱动程序通道单元组态“二进制变量”，必须使用对话框激活并且组态BinWrite机制，否则不可用。先决条件必须安装所需要的通讯处理器和硬件驱动程序。必须安装不支持位/字节访问的期望的通讯驱动程序，例如 “SIMATIC S5 Ethernet Layer 4”。必须使用其中一个通道单元建立连接。步骤 步骤
1 为需要的连接打开弹出式菜单，创建新变量然后选择“新建变量…”。 “创建新变量”对话框将打开。
2 在“常规”标签卡上，“名称”域中，输入在项目范围内唯一的变量名称。为数据类型选择“二进制变量”、“无符号8位数”或“有符号8位数”。
3 单击“选择”按钮，打开“位/字节变量”对话框。(在用位/字节访问通道的情况下，该按钮用来访问为AS中的地址区域所做的设置。)
4 单击“访问位”或“访问字节”复选框并且保留设置。在对话框中查到的内容与步骤2中所选的数据类型有关。
5 单击“确定”关闭对话框。
注意：如果忘记为新的“二进制变量”或8位变量激活BinWrite机制，该对话框仍会打开。如果企图单击“确定”立刻关闭“创建新变量”对话框，则会显示“地址参数无效”的错误消息。通过“是”进行确认。这将打开“位/字节变量”对话框，在此用户可进行所需要的设置。 ,创建新连接外部变量只能在与自动化系统连接的基础上创建。如果还没有需要的连接，必须首先创建该连接。先决条件必须安装所需要的通讯处理器和相关的硬件驱动程序。还必须安装期望的通讯驱动程序，例如“SIMATIC S7 Protocol Suite”步骤
步骤
1 扩展“变量管理”中通讯驱动程序的视图。
2 选择期望的通道单元，例如“PROFIBUS”。
3 在用于通道单元的弹出式菜单中，选择“新建驱动程序连接…”。
4 在“常规”标签卡的“名称”域中，输入在项目范围内唯一的用于连接的名称。
5 单击“属性”按钮，打开“连接参数”对话框。设置该连接所需的参数。有关详细信息，请参考各相应通道的帮助文档。
6 通过单击“确定”，关闭所有的对话框。
组态外部变量创建变量的过程对于所有数据类型基本相似。然而，对某些数据类型进行特殊设置。(步骤5 – 7)。先决条件必须安装所需要的通讯处理器和硬件驱动程序。还必须安装期望的通讯驱动程序，例如“SIMATIC S7 Protocol Suite”。为了使用通道单元，必须建立连接(例如“PROFIBUS”)。步骤
步骤
1 从所期望的连接的弹出式菜单中选择“新建变量”。“变量属性”对话框将打开。
2 在“常规”标签卡上，“名称”域中，输入在WinCC项目范围内唯一的变量名，例如“WinCCTag_01”。
3 设置变量的“数据类型”，例如 “浮点数64位IEEE 754”，在相关域中。
4 单击“选择”打开“变量属性”对话框，在AS中设置变量的地址区域。
在二进制或8位变量的情况下，如果通道不支持按位/字节访问，在“变量属性”对话框前会显示“位/字节变量”对话框。
要获得更多信息，请参考“BinWrite机制”。单击“确定”按钮，关闭“位/字节变量”或“变量属性”对话框。
5 在数字变量的情况下，WinCC会在“类型转换”域中显示建议的类型转换。
按照不同需要，选择合适的的类型转换。转换以“X到Y”的次序显示，(www.dqjsw.com.cn)X是WinCC格式、Y是AS格式，例如“DoubleToDouble”。
6 单击“线性标定”复选框使数字标签线性标定。输入“过程值范围”(在AS中)以及“变量数值范围”(在WinCC中)的上限和下限。
7 当使用文本变量工作，将激活“长度”域。在这种情况下，以字符形式输入文本变量的长度。
8 单击“确定”关闭所有对话框。
WinCC数据类型排序的类型转换当组态外部变量，必须对所有数字型数据类型执行类型转换。WinCC这方面的数据格式决定了数据类型。类型转换定义如何从WinCC格式转换到AS格式。该定义适用于双向传送。从列表中选择期望的WinCC数据类型。下表列出所支持的类型转换和数值范围。WinCC数据类型窗体顶部 类型转换“无符号8位数” 数值范围
ByteToUnsignedByte 0…255 (无转换)
ByteToUnsignedWord 0…255
ByteToUnsignedDword 0…255
ByteToSignedByte 0…127
ByteToSignedWord 0…255
ByteToSignedDword 0…255
ByteToBCDByte 0…99
ByteToBCDWord 0…255
ByteToBCDDword 0…255
ByteToAikenByte 0…99
ByteToAikenWord 0…255
ByteToAikenDword 0…255
ByteToExcessByte 0…99
ByteToExcessWord 0…255
ByteToExcessDword 0…255
“有符号8位数”类型转换 数值范围
CharToUnsignedByte 0…127
CharToUnsignedWord 0…127
CharToUnsignedDword 0…127
CharToSignedByte -128…+127 (无转换)
CharToSignedWord -128…+127
CharToSignedDword -128…+127
CharToMSBByte -128…+127
CharToMSBWord -128…+127
CharToMSBDword -128…+127
CharToBCDByte 0…99
CharToBCDWord 0…127
CharToBCDDword 0…127
CharToSignedBCDByte -9…+9
CharToSignedBCDWord -128…+127
CharToSignedBCDDword -128…+127
CharToExtSignedBCDByte -79…+79
CharToExtSignedBCDWord -128…+127
CharToExtSignedBCDDword -128…+127
CharToAikenByte 0…99
CharToAikenWord 0…127
CharToAikenDword 0…127
CharToSignedAikenByte -9…+9
CharToSignedAikenWord -128…+127
CharToSignedAikenDword -128…+127
CharToExcessByte 0…99
CharToExcessWord 0…127
CharToExcessDword 0…127
CharToSignedExcessByte -9…+9
CharToSignedExcessWord -128…+127
CharToSignedExcessDword -128…+127
“浮点数64位IEEE 754”类型转换 数值范围
DoubleToDouble +-1.79769313486231e+308 (无转换)
DoubleToUnsignedByte 0…255
DoubleToUnsignedWord 0…65535
DoubleToUnsignedDword 0…4294967295
DoubleToSignedByte -128…+127
DoubleToSignedWord -32768…+32767
DoubleToSignedDword -2147483647…+2147483647
DoubleToFloat +-3.402823e+38
DoubleToMSBByte -127…+127
DoubleToMSBWord -32767…+32767
DoubleToMSBDword -2147483647…+2147483647
DoubleToBCDByte 0…99
DoubleToBCDWord 0…9999
DoubleToBCDDword 0…99999999
DoubleToSignedBCDByte -9…+9
DoubleToSignedBCDWord -999…+999
DoubleToSignedBCDDword -9999999…+9999999
DoubleToExtSignedBCDByte -79…+79
DoubleToExtSignedBCDWord -7999…+7999
DoubleToExtSignedBCDDword -79999999…+79999999
DoubleToAikenByte 0…99
DoubleToAikenWord 0…9999
DoubleToAikenDword 0…99999999
DoubleToSignedAikenByte -9…+9
DoubleToSignedAikenWord -999…+999
DoubleToSignedAikenDword -9999999…+9999999
DoubleToExcessByte 0…99
DoubleToExcessWord 0…9999
DoubleToExcessDword 0…99999999
DoubleToSignedExcessByte -9…+9
DoubleToSignedExcessWord -999…+999
DoubleToSignedExcessDword -9999999…+9999999
DoubleToS5Timer 10…9990000
DoubleToS5Float +-1.701411e+38
“无符号32位数”类型转换 数值范围
DwordToUnsignedDword 0…4294967295 (无转换)
DwordToUnsignedByte 0…255
DwordToUnsignedWord 0…65535
DwordToSignedByte 0…127
DwordToSignedWord 0…32767
DwordToSignedDword 0…2147483647
DwordToBCDByte 0…99
DwordToBCDWord 0…9999
DwordToBCDDword 0…99999999
DwordToAikenByte 0…99
DwordToAikenWord 0…9999
DwordToAikenDword 0…99999999
DwordToExcessByte 0…99
DwordToExcessWord 0…9999
DwordToExcessDword 0…99999999
DwordToSimaticTimer 10…9990000
DwordToSimaticBCDTimer 10…9990000
“浮点数32位IEEE 754”类型转换 数值范围
FloatToFloat +-3.402823e+38 (无转换)
FloatToUnsignedByte 0…255
FloatToUnsignedWord 0…65535
FloatToUnsignedDword 0…4.294967e+09
FloatToSignedByte -128…+127
FloatToSignedWord -32768…+32767
FloatToSignedDword -2.147483e+09…+2.147483e+09
FloatToDouble +-3.402823e+38
FloatToMSBByte -127…+127
FloatToMSBWord -32767…+32767
FloatToMSBDword -2.147483e+09…+2.147483e+09
FloatToBCDByte 0…99
FloatToBCDWord 0…9999
FloatToBCDDword 0…9.999999e+07
FloatToSignedBCDByte -9…+9
FloatToSignedBCDWord -999…+999
FloatToSignedBCDDword -9999999…+9999999
FloatToExtSignedBCDByte -79…+79
FloatToExtSignedBCDWord -7999…+7999
FloatToExtSignedBCDDword -7.999999e+07…+7.999999e+07
FloatToAikenByte 0…99
FloatToAikenWord 0…9999
FloatToAikenDword 0…9.999999e+07
FloatToSignedAikenByte -9…+9
FloatToSignedAikenWord -999…+999
FloatToSignedAikenDword -9999999…+9999999
FloatToExcessByte 0…99
FloatToExcessWord 0…9999
FloatToExcessDword 0…9.999999e+07
FloatToSignedExcessByte -9…+9
FloatToSignedExcessWord -999…+999
FloatToSignedExcessDword -9999999…+9999999
FloatToS5Timer 10…9990000
FloatToS5Float +-1.701411e+38
“有符号32位数”类型转换 数值范围
LongToSignedDword -2147483647…+2147483647 (无转换)
LongToUnsignedByte 0…255
LongToUnsignedWord 0…65535
LongToUnsignedDword 0…2147483647
LongToSignedByte -128…+127
LongToSignedWord -32768…+32767
LongToMSBByte -127…+127#p#分页标题#e#
LongToMSBWord -32767…+32767
LongToMSBDword -2147483647…+2147483647
LongToBCDByte 0…99
LongToBCDWord 0…9999
LongToBCDDword 0…99999999
LongToSignedBCDByte -9…+9
LongToSignedBCDWord -999…+999
LongToSignedBCDDword -9999999…+9999999
LongToExtSignedBCDByte -79..+79
LongToExtSignedBCDWord -7999…+7999
LongToExtSignedBCDDword -79999999…+79999999
LongToAikenByte 0…99
LongToAikenWord 0…9999
LongToAikenDword 0…99999999
LongToSignedAikenByte -9…+9
LongToSignedAikenWord -999…+999
LongToSignedAikenDword -9999999…+9999999
LongToExcessByte 0…99
LongToExcessWord 0…9999
LongToExcessDword 0…99999999
LongToSignedExcessByte -9…+9
LongToSignedExcessWord -999…+999
LongToSignedExcessDword -9999999…+9999999
LongToSimaticTimer 10…9990000
LongToSimaticBCDTimer 10…9990000
“有符号16位数”类型转换 数值范围
ShortToUnsignedByte 0…255
ShortToUnsignedWord 0…32767
ShortToUnsignedDword 0…32767
ShortToSignedByte -128…+127
ShortToSignedWord -32768…+32767 (无转换)
ShortToSignedDword -32768…+32767
ShortToMSBByte -127…+127
ShortToMSBWord -32767…+32767
ShortToMSBDword -32768…+32767
ShortToBCDByte 0…99
ShortToBCDWord 0…9999
ShortToBCDDword 0…32767
ShortToSignedBCDByte -9…+9
ShortToSignedBCDWord -999…+999
ShortToSignedBCDDword -32768…+32767
ShortToExtSignedBCDByte -79…+79
ShortToExtSignedBCDWord -7999…+7999
ShortToExtSignedBCDDword -32768…+32767
ShortToAikenByte 0…99
ShortToAikenWord 0…9999
ShortToAikenDword 0…32767
ShortToSignedAikenByte -9…+9
ShortToSignedAikenWord -999…+999
ShortToSignedAikenDword -32768…+32767
ShortToExcessByte 0…99
ShortToExcessWord 0…9999
ShortToExcessDword 0…32767
ShortToSignedExcessByte -9…+9
ShortToSignedExcessWord -999…+999
ShortToSignedExcessDword -32768…+32767
“无符号16位数”类型转换 数值范围
WordToUnsignedWord 0…65535 (无转换)
WordToUnsignedByte 0…255
WordToUnsignedDword 0…65535
WordToSignedByte 0…127
WordToSignedWord 0…32767
WordToSignedDword 0…65535
WordToBCDByte 0…99
WordToBCDWord 0…9999
WordToBCDDword 0…65535
WordToAikenByte 0…99
WordToAikenWord 0…9999
WordToAikenDword 0…65535
WordToExcessByte 0…99
WordToExcessWord 0…9999
WordToExcessDword 0…65535
WordToSimaticCounter 0…999
WordToSimaticBCDCounter 0…999
按AS数据类型排序的类型转换引言在组态外部变量时，必须对所有数字型数据类型执行类型转换。WinCC这方面的数据格式决定了数据类型。类型转换定义如何从WinCC格式转换到AS格式。该定义适用于双向传送。从列表中选择期望的AS数据类型。下表列出所支持的类型转换和数值范围。AS数据类型窗体顶部 所有 AikenByte AikenDword AikenWord BCDByte BCDDword BCDWord Double ExcessByte ExcessDword ExcessWord ExtSignedBCDByte ExtSignedBCDDword ExtSignedBCDWord Float MSBByte MSBDword MSBWord S5Float S5Timer SignedAikenByte SignedAikenDword SignedAikenWord SignedBCDByte SignedBCDDword SignedBCDWord SignedByte SignedDword SignedExcessByte SignedExcessDword SignedExcessWord SignedWord SimaticBCDCounter SimaticBCDTimer SimaticCounter SimaticTimer UnsignedByte UnsignedDword UnsignedWord窗体底部数据类型和数值范围 “无符号字节”类型转换 数值范围
ByteToUnsignedByte 0…255 (无转换)
CharToUnsignedByte 0…127
DoubleToUnsignedByte 0…255
DwordToUnsignedByte 0…255
FloatToUnsignedByte 0…255
LongToUnsignedByte 0…255
ShortToUnsignedByte 0…255
WordToUnsignedByte 0…255
“无符号字”类型转换 数值范围
ByteToUnsignedWord 0…255
CharToUnsignedWord 0…127
DoubleToUnsignedWord 0…65535
DwordToUnsignedWord 0…65535
FloatToUnsignedWord 0…65535
LongToUnsignedWord 0…65535
ShortToUnsignedWord 0…32767
WordToUnsignedWord 0…65535 (无转换)
“无符号双字”类型转换 数值范围
ByteToUnsignedDword 0…255
CharToUnsignedDword 0…127
DoubleToUnsignedDword 0…4294967295
DwordToUnsignedDword 0…4294967295 (无转换)
FloatToUnsignedDword 0…4.294967e+09
LongToUnsignedDword 0…2147483647
ShortToUnsignedDword 0…32767
WordToUnsignedDword 0…65535
“有符号字节”类型转换 数值范围
ByteToSignedByte 0…127
CharToSignedByte -128…+127 (无转换)
DoubleToSignedByte -128…+127
DwordToSignedByte 0…127
FloatToSignedByte -128…+127
LongToSignedByte -128…+127
ShortToSignedByte -128…+127
WordToSignedByte 0…127
“有符号字”类型转换 数值范围
ByteToSignedWord 0…255
CharToSignedWord -128…+127
DoubleToSignedWord -32768…+32767
DwordToSignedWord 0…32767
FloatToSignedWord -32768…+32767
LongToSignedWord -32768…+32767
ShortToSignedWord -32768…+32767 (无转换)
WordToSignedWord 0…32767
“有符号双字”类型转换 数值范围
ByteToSignedDword 0…255
CharToSignedDword -128…+127
DoubleToSignedDword -2147483647…+2147483647
DwordToSignedDword 0…2147483647
FloatToSignedDword -2.147483e+09…+2.147483e+09
LongToSignedDword -2147483647…+2147483647 (无转换)
ShortToSignedDword -32768…+32767
WordToSignedDword 0…65535
“MSBByte”类型转换 数值范围
CharToMSBByte -128…+127
DoubleToMSBByte -127…+127
FloatToMSBByte -127…+127
LongToMSBByte -127…+127
ShortToMSBByte -127…+127
“MSBWord”类型转换 数值范围
CharToMSBWord -128…+127
DoubleToMSBWord -32767…+32767
FloatToMSBWord -32767…+32767
LongToMSBWord -32767…+32767
ShortToMSBWord -32767…+32767
“MSBDWord”类型转换 数值范围
CharToMSBDword -128…+127
DoubleToMSBDword -2147483647…+2147483647
FloatToMSBDword -2.147483e+09…+2.147483e+09
LongToMSBDword -2147483647…+2147483647
ShortToMSBDword -32768…+32767
“BCDByte”类型转换 数值范围
ByteToBCDByte 0…99
CharToBCDByte 0…99
DoubleToBCDByte 0…99
DwordToBCDByte 0…99
FloatToBCDByte 0…99
LongToBCDByte 0…99
ShortToBCDByte 0…99
WordToBCDByte 0…99
“BCDWord”类型转换 数值范围
ByteToBCDWord 0…255
CharToBCDWord 0…127
DoubleToBCDWord 0…9999
DwordToBCDWord 0…9999
FloatToBCDWord 0…9999
LongToBCDWord 0…9999
ShortToBCDWord 0…9999
WordToBCDWord 0…9999
“BCDDWord”类型转换 数值范围
ByteToBCDDword 0…255
CharToBCDDword 0…127
DoubleToBCDDword 0…99999999
DwordToBCDDword 0…99999999
FloatToBCDDword 0…9.999999e+07
LongToBCDDword 0…99999999
ShortToBCDDword 0…32767
WordToBCDDword 0…65535
“SignedBCDByte”类型转换 数值范围
CharToSignedBCDByte -9…+9
DoubleToSignedBCDByte -9…+9
FloatToSignedBCDByte -9…+9
LongToSignedBCDByte -9…+9
ShortToSignedBCDByte -9…+9
“SignedBCDWord”类型转换 数值范围
CharToSignedBCDWord -128…+127
DoubleToSignedBCDWord -999…+999
FloatToSignedBCDWord -999…+999
LongToSignedBCDWord -999…+999
ShortToSignedBCDWord -999…+999
“SignedBCDDWord”类型转换 数值范围
CharToSignedBCDDword -128…+127
DoubleToSignedBCDDword -9999999…+9999999
FloatToSignedBCDDword -9999999…+9999999
LongToSignedBCDDword -9999999…+9999999
ShortToSignedBCDDword -32768…+32767#p#分页标题#e#
“ExtSignedBCDByte”类型转换 数值范围
CharToExtSignedBCDByte -79…+79
DoubleToExtSignedBCDByte -79…+79
FloatToExtSignedBCDByte -79…+79
LongToExtSignedBCDByte -79..+79
ShortToExtSignedBCDByte -79…+79
“ExtSignedBCDWord”类型转换 数值范围
CharToExtSignedBCDWord -128…+127
DoubleToExtSignedBCDWord -7999…+7999
FloatToExtSignedBCDWord -7999…+7999
LongToExtSignedBCDWord -7999…+7999
ShortToExtSignedBCDWord -7999…+7999
“ExtSignedBCDDWord”类型转换 数值范围
CharToExtSignedBCDDword -128…+127
DoubleToExtSignedBCDDword -79999999…+79999999
FloatToExtSignedBCDDword -7.999999e+07…+7.999999e+07
LongToExtSignedBCDDword -79999999…+79999999
ShortToExtSignedBCDDword -32768…+32767
“AikenByte”类型转换 数值范围
ByteToAikenByte 0…99
CharToAikenByte 0…99
DoubleToAikenByte 0…99
DwordToAikenByte 0…99
FloatToAikenByte 0…99
LongToAikenByte 0…99
ShortToAikenByte 0…99
WordToAikenByte 0…99
AikenWord” 数值范围
ByteToAikenWord 0…255
CharToAikenWord 0…127
DoubleToAikenWord 0…9999
DwordToAikenWord 0…9999
FloatToAikenWord 0…9999
LongToAikenWord 0…9999
ShortToAikenWord 0…9999
WordToAikenWord 0…9999
“AikenDWord”类型转换 数值范围
ByteToAikenDword 0…255
CharToAikenDword 0…127
DoubleToAikenDword 0…99999999
DwordToAikenDword 0…99999999
FloatToAikenDword 0…9.999999e+07
LongToAikenDword 0…99999999
ShortToAikenDword 0…32767
WordToAikenDword 0…65535
“SignedAikenByte”类型转换 数值范围
CharToSignedAikenByte -9…+9
DoubleToSignedAikenByte -9…+9
FloatToSignedAikenByte -9…+9
LongToSignedAikenByte -9…+9
ShortToSignedAikenByte -9…+9
“SignedAikenWord”类型转换 数值范围
CharToSignedAikenWord -128…+127
DoubleToSignedAikenWord -999…+999
FloatToSignedAikenWord -999…+999
LongToSignedAikenWord -999…+999
ShortToSignedAikenWord -999…+999
“SignedAikenDWord”类型转换 数值范围
CharToSignedAikenDword -128…+127
DoubleToSignedAikenDword -9999999…+9999999
FloatToSignedAikenDword -9999999…+9999999
LongToSignedAikenDword -9999999…+9999999
ShortToSignedAikenDword -32768…+32767
“ExcessByte”类型转换 数值范围
ByteToExcessByte 0…99
CharToExcessByte 0…99
DoubleToExcessByte 0…99
DwordToExcessByte 0…99
FloatToExcessByte 0…99
LongToExcessByte 0…99
ShortToExcessByte 0…99
WordToExcessByte 0…99
“ExcessWord”类型转换 数值范围
ByteToExcessWord 0…255
CharToExcessWord 0…127
DoubleToExcessWord 0…9999
DwordToExcessWord 0…9999
FloatToExcessWord 0…9999
LongToExcessWord 0…9999
ShortToExcessWord 0…9999
WordToExcessWord 0…9999
“ExcessDWord”类型转换 数值范围
ByteToExcessDword 0…255
CharToExcessDword 0…127
DoubleToExcessDword 0…99999999
DwordToExcessDword 0…99999999
FloatToExcessDword 0…9.999999e+07
LongToExcessDword 0…99999999
ShortToExcessDword 0…32767
WordToExcessDword 0…65535
“SignedExcessByte”类型转换 数值范围
CharToSignedExcessByte -9…+9
DoubleToSignedExcessByte -9…+9
FloatToSignedExcessByte -9…+9
LongToSignedExcessByte -9…+9
ShortToSignedExcessByte -9…+9
“SignedExcessWord”类型转换 数值范围
CharToSignedExcessWord -128…+127
DoubleToSignedExcessWord -999…+999
FloatToSignedExcessWord -999…+999
LongToSignedExcessWord -999…+999
ShortToSignedExcessWord -999…+999
“SignedExcessDWord”类型转换 数值范围
CharToSignedExcessDword -128…+127
DoubleToSignedExcessDword -9999999…+9999999
FloatToSignedExcessDword -9999999…+9999999
LongToSignedExcessDword -9999999…+9999999
ShortToSignedExcessDword -32768…+32767
“SimaticCounter”类型转换 数值范围
WordToSimaticCounter 0…999
“SimaticBCDCounter”类型转换 数值范围
WordToSimaticBCDCounter 0…999
“SimaticTimer”类型转换 数值范围
DwordToSimaticTimer 10…9990000
LongToSimaticTimer 10…9990000
“S5Float”类型转换 数值范围
DoubleToS5Float +-1.701411e+38
FloatToS5Float +-1.701411e+38
“S5Timer”类型转换 数值范围
DoubleToS5Timer 10…9990000
FloatToS5Timer 10…9990000
“SimaticBCDTimer”类型转换 数值范围
DwordToSimaticBCDTimer 10…9990000
LongToSimaticBCDTimer 10…9990000
“Double”类型转换 数值范围
DoubleToDouble +-1.79769313486231e+308 (无转换)
FloatToDouble +-3.402823e+38
“Float”类型转换 数值范围
DoubleToFloat +-3.402823e+38
FloatToFloat +-3.402823e+38 (无转换)
BinWrite机制引言在WinCC中，一些通讯驱动程序及其通道单元不支持直接按位或字节访问(位/字节访问)已连接的自动化系统中的地址区域。于是，他们使用BinWrite机制。位/字节访问用位/字节访问通讯驱动程序的通道单元可直接读写期望的位或字节。在以下说明中，位x的数值通过直接位/字节访问设置为1。BinWrite机制下列通讯驱动程序不支持位/字节访问，使用BinWrite机制代替通道单元：Modbus SerialSIMATIC S5 ETHERNET LAYER 4SIMATIC S5 Programmers Port AS511SIMATIC S5 Serial 3964RSIMATIC TI Ethernet Layer 4SIMATIC TI Serial为了写位或字节，通道单元使用BinWrite机制首先读取整个数据字。已编址的位或字节在已读取的字中改变。然后，整个字(！)而不只是修改过的位或字节会被写回内存。在以下说明中，位x的数值通过使用BinWrite机制设置为1。 注意如果AS中的字在WinCC使用BinWrite机制读取过后，进行了修改(参见说明中的“问题案例”)，则当WinCC把字写回内存时，会覆盖由AS改变的数据。用BinWrite组态变量如果想为不支持位/字节访问的通讯驱动程序通道单元组态“二进制变量”，必须使用对话框激活并且组态BinWrite机制，否则不可用。先决条件必须安装所需要的通讯处理器和硬件驱动程序。必须安装不支持位/字节访问的期望的通讯驱动程序，例如 “SIMATIC S5 Ethernet Layer 4”。必须使用其中一个通道单元建立连接。步骤 步骤
1 为需要的连接打开弹出式菜单，创建新变量然后选择“新建变量…”。 “创建新变量”对话框将打开。
2 在“常规”标签卡上，“名称”域中，输入在项目范围内唯一的变量名称。为数据类型选择“二进制变量”、“无符号8位数”或“有符号8位数”。
3 单击“选择”按钮，打开“位/字节变量”对话框。(在用位/字节访问通道的情况下，该按钮用来访问为AS中的地址区域所做的设置。)
4 单击“访问位”或“访问字节”复选框并且保留设置。在对话框中查到的内容与步骤2中所选的数据类型有关。
5 单击“确定”关闭对话框。
注意：如果忘记为新的“二进制变量”或8位变量激活BinWrite机制，该对话框仍会打开。如果企图单击“确定”立刻关闭“创建新变量”对话框，则会显示“地址参数无效”的错误消息。通过“是”进行确认。这将打开“位/字节变量”对话框，在此用户可进行所需要的设置。
西门子上位机WINCC怎样与外部变量进行连接
