Omron NX701-17 Series User Manual page 63

Additional Information
Object Dictionary
The object dictionary is a data table within the device that interfaces the application and commu-
nications. It describes the information handled by the device. Each piece of information is called
an object. Each object is assigned a 4-digit hexadecimal index.
Each object is divided into a data type area, a CoE communications area, and a manufacturer-
specific area.
CANopen device
Application
Index
1000 hex
1600 hex
3000 hex
Communications
PDO
EtherCAT
Process data communications is used to read and write the process data in the CoE communi-
cations area in these objects.
SDO communications is used to read and write the parameters within the manufacturer-specific
area in these objects.
NJ/NX-series CPU Unit Built-in EtherCAT Port User's Manual (W505)
Object content
Device Type
Object dictionary
Process Data
Parameters
SDO
3 EtherCAT Communications
3
3-3