Siemens SINUMERIK 840Di Function Manual page 108

Detailed Description
2.4 Protection zones
A protection zone cannot be described by a complete circle. A complete circle must be
divided into two half circles.
The sequence G2, G3 or G3, G2 is not permitted. A short G1 block must be inserted
between the two circular blocks.
Constraints
During the definition of a protection zone, the following functions must not be active or used:
• Tool radius compensation (cutter radius compensation, tool nose radius compensation)
• Transformation,
• Reference point approach (G74)
• Fixed point approach (G75)
• Dwell time (G4)
• Block search stop (STOPRE)
• End of program (M17, M30)
• M functions: M0, M1, M2
Programmable frames (TRANS, ROT, SCALE, MIRROR) and configurable frames (G54 to G57)
are ineffective.
Inch/metric switchovers with G70/G71 or G700/G710 are effective.
End of definition
The end of definition is defined by the following subroutine:
EXECUTE(NOT_USED)
Parameters Type
NOT_USED
The definition of a machine or channel-related protection zone is completed with the
subroutine EXECUTE(n).
2.4.4 Definition via system variable
General
If the protection zones are defined with part program instructions (see Chapter: Definition by
means of part program instructions), the protection zone data are stored in system variables.
The system variables can also be written directly so that the definition of protection areas
can also be performed directly in the system variables.
2-36
Description
Error variable has no effect in protection zones with EXECUTE.
INT
Axis Monitoring, Protection Zones (A3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0