Siemens SINUMERIK 840Di Function Manual page 109

The same supplementary conditions apply for the definition of the contour of a protection
zone as for a protection zone definition via part program instructions.
System variable
The protection zone definitions include the following system variables:
System variable
$SN_PA_ACTIV_IMME
D[n]
$SC_PA_ACTIV_IMME
D[n]
$SN_PA_T_W[n]
$SC_PA_T_W[n]
$SN_PA_ORI[n]
$SC_PA_ORI[n]
$SN_PA_LIM_3DIM[n]
$SC_PA_LIM_3DIM[n]
$SN_PA_PLUS_LIM[n]
$SC_PA_PLUS_LIM[n]
$SN_PA_MINUS_LIM[
n]
$SC_PA_MINUS_LIM[
n]
$SN_PA_CONT_NUM[
n]
$SC_PA_CONT_NUM[
n]
$SN_PA_CONT_TYP[n
, i]
$SC_PA_CONT_TYP[n
, i]
$SN_PA_CONT_ABS[
n, i]
$SC_PA_CONT_ABS[
n, i]
$SN_PA_CONT_ORD[
n, i]
$SC_PA_CONT_ORD[
n, i]
Axis Monitoring, Protection Zones (A3)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Type Meaning
BOOL Activation type
The protection zone is active immediately after power up of the
control and referencing of the axes.
FALSE: not immediately active
TRUE: immediately active
Protection zone type
INT
0: Workpiece-related protection zone
1: Reserved
2: Reserved
3: Tool-related protection zone
Orientation of the protection zone, i.e. polygon definition in the plane
INT
of:
0: 1. and 2nd geometry axis
1: 3. and 1st geometry axis
2: 2. and 3ard geometry axis
Type of limitation in the third dimension
INT
0: No limit
1: Limit in positive direction
2: Limit in negative direction
3: Limit in positive and negative direction
REAL Value of the limit in the positive direction in the 3rd dimension
REAL Value of the limit in the negative direction in the 3rd dimension
Number of valid contour elements
INT
Contour type[i], contour type (G1, G2, G3) of the nth contour element
INT
REAL End point of the contour[i], abscissa value
REAL End point of the contour[i], ordinate value
Detailed Description
2.4 Protection zones
2-37