Function Blocks are used to enable serial communications for the EP-5261 module, please go here to download the function blocks:
EP-5261 - Function Blocks Toolchest Drawer .
GFK-2992H: Updates to PLC application function block
GFK-2992G: Updates to correct the details of the status and diagnosis data of process input data
GFK-2992F - Reset of serial communications after losing PROFINET or serial communications.
GFK-2992B, RSTi-EP Serial Communication Module IPI
GFK-2992E - Document formatting