Siemens SIMATIC S5 Manual page 284

Link the IP247 into the user program of the CPU
Load the handling blocks for the appropriate CPU
S5-11 5
S5-135/CPW2z928
S5-150
S5-155
Load the standard function block FB164 for the appropriate CPU. (If required, use the
supplied example program.)
Call the function block "SYNC HRON'L in the start-up OBS 20-22 once for each axis you
wish to operate (parameter assignment: => Part 6 "Standard Function Blocks FB164 and
FBI 65").
Assign parameters inFB164 and call it unconditionally once in each cycle.
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