Siemens SINUMERIK 840D sl Function Manual page 1204

Detailed description
2.12 Block descriptions
Note
Please note:
FC 18 must be called cyclically until signal "InPos" or, in the case of an error "Error",
produces an edge transition of 1 to 0. Only when the "InPos"/"Error" signal has a 0 state,
another "Start" or "Stop" is possible for this spindle/axis (the next "Start" or "Stop" must be
delayed by at least one PLC cycle). This also applies when the assignment in data byte 8 on
the axial interface has been changed.
Abort:
The function cannot be aborted by means of parameter "Start" or "Stop", but only by means
of the axial interface signals (e.g., delete distancetogo).
The axial interface also returns status signals of the axis that may need to be evaluated
(e.g., exact stop, traverse command).
InPos on spindle - rotation/oscillation:
For the function "Rotate spindle" as also for "Oscillate spindle" the meaning of the parameter
"InPos" is defined as follows:
Set speed is output --> Function started without error.
Reaching the desired spindle speed must be evalated via the spindle interface.
Simultaneity:
Several axes can be traversed simultaneously or subject to a delay by the blocks FC 15, 16
and 18. The upper limit is defined by the maximum number of axes. The NCK handles the
PLC function request (FC 15, 16, 18) via independent interfaces for each axis/spindle.
Axis disable:
With the axis disabled, an axis controlled via FC 18 will not move. Only a simulated actual
value is generated. (Behavior as with NC programming).
Warning
If several block calls (FC 15, FC 16, FC 18) are programmed for the same axis/spindle in the
PLC user program, then the functions concerned must be interlocked by conditional calls in
the user program. The conditional call of a started block (parameter "Start" or "Stop" =
TRUE) must be called cyclically until the state change of output parameter Active or InPos
takes place from 1 to 0.
220
Basic logic functions: PLC Basic program powerline (P3 pl)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0