Programming manual.
CNC 8070
12.
ADDITIONAL PREPARATORY FUNCTIONS
Software limits.
·230·
(REF: 1709)
12.2.2 Define the first software limit via variables.
The first software limits can also be defined by the variables equivalent to G198/G199. The
functions and the variables modify the same software limits; therefore, either ones may be
used.
On power-up, these variables assume the values of the machine parameters (LIMIT+ /
LIMIT-).
Programming of software limits.
Programming is equivalent to G198/G199. Both limits of an axis (lower and upper) may be
positive or negative; but the lower limits must be smaller than the upper ones. When setting
both upper and lower limits of an axis to ·0·, the CNC cancels the first software limit of that
axis and applies the second one (if it has been defined).
Considerations.
Absolute (G90) or incremental (G91) programming.
Unlike functions G198/G199, the limits defined with variables do not depend on functions
G90/G91, they are always in absolute coordinates and in the machine reference system.
Axes out of position.
If after setting the new limits, an axis positions beyond them, it will be possible to move that
axis towards the work zone (between those limits).
Programming on a lathe (radius/diameter).
The software limits are always defined in radius, regardless of the setting of parameter
DIAMPROG and the active function G151/G152.
Influence of the reset, turning the CNC off and of the M30.
After an M02 or M30 and after an emergency or a reset, the CNC maintains the software
limits set by these variables.
V.A.NEGLIMIT.xn Set lower software travel limits (first limit). Variable equivalent to
G198.
V.A.POSLIMIT.xn Set upper software travel limits (first limit). Variable equivalent to
G199.
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