Mitsubishi Electric MELSEC iQ-R Series User Manual page 124

Buffered during multiple axes operation
Multiple started FBs are buffered and wait until the on-going FB is completed. After the on-going FB is normally completed,
multiple started FBs are performed in the order of being buffered.
Interpolation speed
Execute
Busy
FB1
Active
Done
Execute
Busy
FB2
Active
Done
4 START AND STOP
122
4.3 Multiple Start (Buffer Mode)
The following FB starts
Multiple start timing
after stopping at the target position
FB being executed
Buffering FB
Time