SDO services READ and WRITE
The user interface of the SDO service is displayed differently depending on the POWERLINK master or programming environment.
Certain sizes and information on the performance of the service are always required:
SDO READ service | Description |
|---|---|
Name of POWERLINK interface | Interface between PLC and inverter. |
Node number | Address of the inverter. |
Index Subindex | Address in the object directory of the inverter from which data is to be read. |
SDO WRITE service | Description |
|---|---|
Name of POWERLINK interface | Interface between PLC and inverter. |
Node number | Address of the inverter. |
Index Subindex | Address in the object directory of the inverter that is to be written. |
Data | Structure in which the data to be written is stored. |
Data length | Length of the data that is to be written. |
Additional flags and parameters may be required:
- For activating the function
- For "In-process messages" or error messages
- For timeout monitoring
To be able to use the non-cyclical parameter access, the manufacturer of the POWERLINK master usually provides corresponding libraries and function blocks.
The following libraries and function blocks are required for the POWERLINK master from B&R Industrial Automation GmbH:
Library | Function blocks |
|---|---|
| Read: |
Write: |
For more information on the parameters of the function blocks, refer to the online help of the Automation Studio engineering tool.
