Yaskawa MotionWorks IEC - Manual (Page 145)

PLCopenPlus Function Blocks for Motion Control 2013-04-13 137
4648 The parameter number does not exist for the specified axis
4676 The time value must be within 0 to 10 MECHATROLINK cycles.
57617 Instance object is NULL.
57620 The structure size does not match.
Example
Instance of MC_ReadParameter reading non cyclic actual position of an axis