Yaskawa MotionWorks IEC - Manual (Page 390)

PLCopenPlus Function Blocks for Motion Control 2013-04-13 382
Note:
1) For rotary mode applications using the Moving Average Filter, use
firmware 1.2.1 or greater.
2) The Moving Average Filter Time Constant parameter (1301) can be
changed only after the current moving average time constant has been
processed by the motion profiler. For example, if parameter 1301 is set to
2.0 s using MC_WriteParameter at time instant 't', the next change to
1301 can be made only after time instant 't+2.0'. If an attempt to write it
sooner is made, MC_WriteParameter will output an errorID 4675.