Yaskawa MotionWorks IEC - Manual (Page 19)

PLCopenPlus Function Blocks for Motion Control 2013-04-13 11
outputs may still change. For one axis, several
Function Blocks might be busy, but only one can
be active at a time. Exceptions are
'MC_SuperImposed' and 'MC_Phasing', where
more than one FB related to one axis can be
active.
Output ‘Active’ The 'Active' output is available on Function
Blocks with buffering capabilities. This output is
set at the moment the function block takes
control of the axis. For unbuffered mode the
outputs “Active” and “Busy” can have the same
value.
Enable and Valid
Status The 'Enable' input is coupled to a 'Valid' output.
'Enable' is level sensitive, and 'Valid' shows that
a valid set of outputs is available at the FB. The
'Valid' output is TRUE as long as a valid output
value is available and the 'Enable' input is
TRUE. The relevant output values are refreshed
while the input 'Enable' is TRUE. If there is a FB
error, the output is not valid (“Valid” set to
FALSE). When the error condition disappears,
the values will reappear and 'Valid' output will
be set again.