# Axes group library – PLCopen Part4

Besides FBs that comply with PLCopen specifications, the McpPLCopenP4.lib user library also defines FBs which cover additional functions and which must be used to implement an application. This library is referred to below as the Axis group library. The version scope may vary depending on the PLC platform used.

The figure below shows the structure of the motion library. The main elements in the library are then explained in greater detail.

Overview of the McpPLCopenP4.lib motion library in CoDeSys

## Additional information

- Function block MCV_AxesGroup
- Function block MCV_P4_PLATFORM
- PLCopen function blocks