Object Dictionary; Process And Service Data Objects - TR-Electronic 65 Serie Gesamt-Bedienungsanleitung

3.5 Object dictionary

The object dictionary structures the data of a POWERLINK device in a clear tabular
arrangement. It contains all device parameters and all current process data, which are
therefore also accessible via the SDO.
Index (hex)
0x0000
0x0001-0x009F
0x00A0-0x0FFF
0x1000-0x1FFF
0x2000-0x5FFF
0x6000-0x9FFF
0xA000-0xBFFF
0xC000-0xFFFF
Figure 6: Structure of the object dictionary

3.6 Process and Service Data Objects

Process Data Object (PDO)
Process Data Objects manage the process data exchange, e.g. the cyclical
transmission of the position value.
Service Data Object (SDO)
Service Data Objects manage the parameter data exchange, e.g. the acyclical
execution of the preset function.
The SDO provides an efficient communication mechanism for parameter data of any
size. A service data channel for parameter communication is formed between the
configuration master and the connected devices for this purpose. The device
parameters can be written to or read from the device object dictionary with a unique
frame handshake.
Important features of SDO and PDO
Figure 7: Comparison of PDO/SDO characteristics
Printed in the Federal Republic of Germany
06/26/2017
Object
not used
Data type definitions
reserved
Communication Profile Area (CiA DS-301, DS-302)
Manufacturer Specific Profile Area
Standardized Device Profile Area (CiA DS-406)
Standardized Interface Profile Area
reserved
TR - ECE - BA - DGB - 0071 - 05
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