Difference between revisions of "EtherCAT:EC SDO READ STRING"
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Latest revision as of 16:57, 6 May 2017
| Language: | English • 中文（简体） |
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Similar to EC_SDO_READ, this function allows reading STRING values.
To read data from the slave we have to specify a SDO index and a sub-index.
The first sub-index is 0. If only one sub-index exists, we still have to specify 0 (we cannot omit this field).
The read value is returned from the function and can be set to a variable.
Input
Slave address, SDO index, SDO sub-index.
Output
str_length - This output variable is populated by the function with the string's length
Return Value
String that is read from the slave.
Declaration
public function EC_SDO_READ_STRING(byval slaveaddres as long, byval index as long, byval subindex as long, str_length as long) as string
Syntax
retVal = EC_SDO_READ_STRING(<Slave address>, <SDO index>, <SDO sub-index>, <String's length>)
Exceptions
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
Examples
ret_Str = EC_SDO_READ_STRING(module_address, 0x6000, 1, length)