Siemens SINUMERIK 840D sl Programming Manual page 163

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For certain kinematic transformations (e.g. TRANSMIT), the position of the machine axes

cannot be determined uniquely from the positions in the workpiece coordinate system (WCS)

(non-uniqueness). In the normal traversing operation, the uniqueness normally results from

the previous history and the condition that a continuous movement in the WCS must

correspond to a continuous movement in the machine axes. When monitoring the software

limits using the CALCPOSI function, the current machine position is therefore used to

resolve non-unique determinability in such cases. If necessary, a STOPRE must be

programmed in front of CALCPOSI to input valid machine axis positions to the function.

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.

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, 03/2006 Edition, 6FC5398-2BP10-1BA0

4.3 Checking for protection zone violation, working area limitation and software limits

Protection zones