Siemens SINUMERIK 840D sl, Function Manual

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Detailed description
2.12 Block descriptions
Basic logic functions: PLC basic program solution line (P3 sl)
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Function Manual, 11/2006, 6FC5397-0BP10-2BA0
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 can
the axis/spindle concerned be "started" or "stopped" again (the next "start" 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 axis
status signals that may need to be evaluated
(e.g., exact stop, traverse command).
InPos on spindle - rotation/oscillation:
For the function "Rotate spindle" and also for "Oscillate spindle" the significance of the
parameter "InPos" is defined as follows:
Setpoint speed is output --> function started without errors.
Reaching the desired spindle speed must be evaluated via the spindle interface.
Simultaneity:
Several axes can be traversed simultaneously or subject to a delay by FC 18 blocks. The
upper limit is defined by the maximum number of axes. The NCK handles the PLC function
request (FC 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 18) have been 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 signal state of output parameter "Active" or "InPos" changes
from 1 to 0.