Difference between revisions of "EtherCAT:EC SDO READ DOUBLE/zh-hans"

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(Created page with "{{Languages}} == 描述 == Similar to EC_SDO_READ, this function allows reading DOUBLE values.<br/> To read data from the slave you must specify an S...")
 
 
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{{Languages}}
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{{Languages|EtherCAT:EC_SDO_READ_DOUBLE}}
  
 
== 描述 ==
 
== 描述 ==
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Similar to [[EtherCAT:EC SDO READ|EC_SDO_READ]], this function allows reading DOUBLE values.<br/>
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与[[EtherCAT:EC SDO READ|EC_SDO_READ]]类似,此功能允许读取DOUBLE值。<br/>
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To read data from the slave you must specify an SDO index and a sub-index.<br/>
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The first sub-index is 0. If the object has only one sub-index, you must still specify 0 (this field cannot be omitted).<br/>
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要从从站读取数据，您必须指定SDO索引和子索引.<br/>
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The read value is returned from the function and can be set to a variable.<br/>
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第一个子索引为0.如果对象只有一个子索引，则仍必须指定0（此字段不能省略）。<br/>
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读取值从函数返回，可以设置为变量。<br/>
  
 
{{Note/Important|
 
{{Note/Important|
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Only 32 bits variables can be read.}}
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只能读取32位变量.}}
 
<br/>
 
<br/>
 
== 输入 ==
 
== 输入 ==
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== 返回值 ==
 
== 返回值 ==
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Value that is read from the slave.
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从从站读取的值。
  
 
== 声明 ==
 
== 声明 ==
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== 例子 ==
 
== 例子 ==
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retVal = EC_SDO_READ_DOUBLE(ax.Dadd, 0x2027, 0, 32)  '  Read CDHD kvp
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retVal = EC_SDO_READ_DOUBLE(ax.Dadd, 0x2027, 0, 32)  '  读取 CDHD驱动器kvp
  
 
== 参见 ==
 
== 参见 ==

Latest revision as of 16:54, 6 May 2017

语言: English  • 中文（简体）‎

描述

与EC_SDO_READ类似,此功能允许读取DOUBLE值。

要从从站读取数据，您必须指定SDO索引和子索引.
第一个子索引为0.如果对象只有一个子索引，则仍必须指定0（此字段不能省略）。
读取值从函数返回，可以设置为变量。

IMPORTANT.svgIMPORTANT
只能读取32位变量.


输入

Slave address, SDO index, SDO sub-index, Variable size (32 or 64 bits).

输出

None

返回值

从从站读取的值。

声明

public function EC_SDO_READ_DOUBLE(byval slaveaddres as long, byval index as long, byval subindex as long, byval varSize as long) as double

格式

retVal = EC_SDO_READ_DOUBLE(<Slave address>, <SDO index>, <SDO sub-index>, <Variable Size>)

例外

EC_SDO_READ_WRITE_DOUBLE - "SDO READ/WRITE DOUBLE ERROR: Invalid Size. Must be 32 or 64" 20071
EC_SLAVE_ADDRESS_ERROR - "SLAVE ADDRESS ERROR" 20032
EC_SDO_READ_WRITE_ONLY - "SDO READ ERROR: Attempt to read a write-only object" 20060
EC_SDO_READ_SIZE - "SDO READ ERROR: Received an unreasonable amount of data" 20064

例子

retVal = EC_SDO_READ_DOUBLE(ax.Dadd, 0x2027, 0, 32) ' 读取 CDHD驱动器kvp

参见

Retrieved from "http://softmc.servotronix.com/index.php?title=EtherCAT:EC_SDO_READ_DOUBLE/zh-hans&oldid=128615"