Difference between revisions of "EtherCAT:EC SDO READ DOUBLE"

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Latest revision as of 16:25, 6 May 2017

Language: English  • 中文(简体)‎

Similar to EC_SDO_READ, this function allows reading DOUBLE values.
To read data from the slave you must specify an SDO index and a sub-index.
The first sub-index is 0. If the object has only one sub-index, you must still specify 0 (this field cannot be omitted).
The read value is returned from the function and can be set to a variable.

IMPORTANT.svgIMPORTANT
Only 32 bits variables can be read.


Input

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

Output

None

Return Value

Value that is read from the slave.

Declaration

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

Syntax

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

Exceptions

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

Examples

retVal = EC_SDO_READ_DOUBLE(ax.Dadd, 0x2027, 0, 32) ' Read CDHD kvp

See Also