Continuous Path Mode, Exact Stop and LookAhead (B1)
3.3 Exact stop
Turning, Milling, Nibbling
Function Manual, 11/2012, 6FC5397-1CP10-5BA0
61
The use of the exact stop function is suitable for precise traversing of contours.
Exact stop is not suitable if
● Exact traversing of the contour on the basis of the criterion (e.g. exact stop fine) can
deviate from the programmed contour in order to achieve faster machining.
● An absolutely constant velocity is required.
Activate exact stop
The "Exact stop" function can be selected in the NC part program by command G60 or G9.
G60 is modal, G9 is non-modal. G9 is used if continuous path mode is to be interrupted.
Both exact stop functions only function with the selected exact stop criterion (G601, G602).
The "exact stop" function is de-selected with the continuous path mode function (G64).
Exact-stop criteria
● Exact stop fine: G601
This criterion is applied to monitor whether the actual/setpoint position deviation of the
axis has remained within a specific distance. The value of the permissible distance is
stored in MD36010 STOP_LIMIT_FINE (exact stop fine)
● Exact stop coarse: G602
Functions as exact stop fine, although the monitoring window is stored in MD36000
STOP_LIMIT_COARSE (exact stop coarse). To permit a faster block change than with
the exact stop fine criterion, the exact stop coarse criterion is set to be larger than the
exact stop fine criterion.
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Figure 3-1 Block change depending on exact-stop criteria
Interpolator end
Interpolator end is achieved when the interpolator has calculated the setpoint velocity of the
axes from zero for an interpolation cycle. However, the actual positions of the path axes
have not reached the target (following error).
Irrespective of continuous-path mode or the active exact-stop criteria for the exact-stop
function, "interpolator end" transfers the auxiliary functions present in the block to the PLC if
they are to be output after the end of motion.
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