Detailed Description
2.12 Block descriptions
PLC Basic Program Solution Line (P3 sl)
2-184 Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
To be able to control an axis or spindle via the PLC, it must be activated for the PLC. This
can, for example, be achieved by calling the FC "SpinCtrl" with activation of the "Start" or
"Stop" parameter. In this case, the FC "SpinCtrl" requests control over the spindle/axis from
the NC.
The NC feeds back the status of this spindle/axis in byte 68 in the associated spindle/axis
interface (DB 31, ...) (see interface lists). Once the axis/spindle is operating under
PLC control, the travel command for the active state can be evaluated via the relevant axis
interface.
On completion ("InPos" is True, "Start" changes to zero), the axis/spindle check function is
switched to a neutral status by FC "SpinCtrl".
Alternatively, the PLC user program can also request the check for the PLC prior to calling
FC "SpinCtrl".
By calling this function several times in succession, a better response reaction by the
spindle/axis can be obtained as the changeover process in the FC can be omitted.
Activation through the PLC user program is executed in the corresponding spindle interface
in byte 8.
After return of the check, the spindle can again be programmed by the NC program.
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 distance-to-go). 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 "Rotate spindle" and "Oscillate spindle" functions, the meaning of the "InPos"
parameter is defined as follows:
Setpoint speed is output --> function was started without error.
The reaching of the required spindle speed must be evaluated using 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).
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