Rockwell Automation 855T DeviceNet Stack Light User Manual - Manual (Page 65)

DeviceNet Information B-16
Publication 855T-UM001C-EN-P May 2005
Instance Attributes
➊ Semantics of Descriptor Instance Attribute
Common Services
Table B.25
Attribute Access Name Type Value
1 Get/Set Parameter_Value Specified in Data Type —
2 Get Link_Path_Size USINT 6
3 Get Link_Path Array of BYTE —
4 Get Descriptor WORD 0 ➊
5 Get Data_Type USINT —
6 Get Data_Size USINT —
Bit Definition Meaning
0 Supports Settable Path Indicates that link path can be set.
1 Supports Enumerated
Strings Indicates that enumerated strings are supported and can be read with
Get_Enum_String service.
2 Supports Scaling Indicates that the scaling factor should be implemented to present the
value to the user in engineering units.
3 Supports Scaling Links Indicates that the values for the scaling factor may be retrieved from
other parameters.
4 Read Only Parameter Indicates that the value attribute can only be read, and not set.
5 Monitor Parameter Indicates that the value attribute is updated in real time by the device.
6 Supports Extended
Precision Scaling Indicates that the extended precision scaling factor should be
implemented to present the value to the user in engineering units.
Table B.26
Service Code Class Instance Service Name
14 (0x0E) Yes Yes Get_Attribute_Single
16 (0x10) No Yes Set_Attribute_Single