Step 4: Linking the axes to PLCopen FBs
The axis reference g_array_axis_ref[0] which links to the first axis in the system is applied to all PLCopen FBs..
![Interfacing the first axis in the system to PLCopen FBs via g_array_axis_ref[0]](../Images/png/193693067__en__Web.png)
The axis reference g_array_axis_ref[0] which links to the first axis in the system is applied to all PLCopen FBs..