Siemens SINUMERIK 828D Programming Manual page 232

Protection zones
3.3 Checking for protection zone violation, working area limitation and software limits (CALCPOSI)
It is not guaranteed that the separation to the protection zones specified in _DLIMIT[3] can
always be maintained for a movement on the specified traversal path. Therefore if the end
point returned in _MOVDIST is lengthened by this distance, no protection zone is violated,
even though the straight line may pass extremely close to a protection zone.
Note
You will find details on working area limitations in the
/PG/ Fundamentals Programming Guide,
on the software limits in
/FB1/ Function Manual, Basic Functions; Axis Monitoring, Protection Zones (A3).
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Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
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