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Q

EtherCAT device identificationin different XML files/schemas

A

An EtherCAT device identificationcontains three elements: Vendor Id, ProductCode and Revision Number.

These elements are defined in EtherCAT Slave Information file, DTMInformationSchema and FDTEtherCATIdentSchema. And FDTEtherCATScanIdentSchema uses DTMInformationSchema to define the scan response XML.

The following table illustrates the mapping of identifier definition in these files/schemas.

 

 

IdetifierEtherCAT Slave Information file

 FDTEtherCATIdentSchema/

FDTEtherCATScanIdentSchema

 DTMInformationSchema

 Vendor Id

(Data type: UINT32)

Element "Id"

 

Element data type: string, represents a decimal number like "2" or represents a hexidecimal value wiht prefix #x and eight hexidecimal numbers, e.g. "#x00000078".

XPath: /EtherCATInfo/Vendor/Id

 

Attribute "vendorID"

 

Attribute data type: ui4

XPath in FDTEtherCATScanIdentSchema:

/FDT/ScanIdentifications/ScanIdentification/VendorId@vendorID

 

Attribute "manufacturerId"

 

Attribute data type: ui4

XPath:/FDT/DtmInfo/DtmDeviceTypes/DtmDeviceType@manufacturerId

 

The manufacturerId tag holds the vendor’s ID number, as it

should be retrieved from

• either the device description file (XPath /EtherCATInfo

/Vendor/Id), or

• the SII (address 0x0008), or

• the CoE dictionary (object 0x1018:1).

For the purpose of displaying or editing, the hexadecimal

notation should be used.

 Product code

(Data type: UINT32)

Attribute "ProductCode"

 

Attribute data type: string, with prefix #x and eight hexidecimal numbers. e.g. #x00010002.

XPath: /EtherCATInfo/Devices/Device/Type@ProductCode

Attribute "productCode"

 

Attribute data type: ui4

XPath in FDTEtherCATScanIdentSchema:

/FDT/ScanIdentifications/ScanIdentification/ProductCode@productCode

 Attribute "deviceTypeId"

 

Attribute data type: ui4

XPath:/FDT/DtmInfo/DtmDeviceTypes/DtmDeviceType@deviceTypeId

 

The deviceTypeId must contain the device type identifier

according to the EtherCAT specification, as it should be

derived from either

• the device description file (XPath /EtherCATInfo

/Descriptions /Devices /Device /Type @ProductCode),

or

• the SII (address 0x000A), or

• the CoE dictionary (object 0x1018:2).

For the purpose of displaying or editing, the hexadecimal

notation should be used.

 

Revision number

(Data type: UINT32)

Attribute "RevisionNo"

 

Attribute data type: string, with prefix #x and eight hexidecimal numbers. e.g. #x00010002.

XPath: /EtherCATInfo/Devices/Device/Type/@RevisionNo

Attribute "revisionNo"

 

Attribute data type: ui4

XPath in FDTEtherCATScanIdentSchema:

/FDT/ScanIdentifications/ScanIdentification/RevisionNo@revisionNo

Attribute "subDeviceType"

 

Attribute data type: string

XPath:/FDT/DtmInfo/DtmDeviceTypes/DtmDeviceType@subDeviceType

 

The version tag holds the string representation of an unsigned

32 bit integer in hexadecimal that is equivalent to an

EtherCAT’s device revision number. This number is preceded

by a hash character and the lower case character Latin x and

should be retrieved from

• either the device description file (XPath /EtherCATInfo

/Description /Devices /Device /Type @RevisionNo), or

• the SII (address 0x000C), or

• the CoE dictionary (object 0x1018:3).

If the number is shorter than eight hexadecimal digits, it is

padded by leading zeros.

For example: #x00010002