Siemens SINUMERIK 828D Function Manual page 1000

P3: Basic PLC Program for SINUMERIK 840D sl
13.13 Block descriptions
Auxiliary functions
Generally, high-speed or acknowledging auxiliary functions are processed with or without interrupt control
independently of any assignment.
Basic-program parameters in FB 1 can be set to define which auxiliary functions (T, H, DL) must be processed
solely on an interrupt­driven basis by the user program.
Functions which are not assigned via interrupts are only made available by the cyclic basic program as in earlier
versions. The change signals of these functions are available in a PLC cycle.
Even if the selection for the auxiliary function groups (T, H, DL) is made using interrupt control, only one interrupt
can be processed by the user program for the selected functions.
A bit is set channel­specifically in the local data "GP_AuxFunction" for the user program (if "GP_AuxFunction[1]"
is set, then an auxiliary function is available for the 1st channel).
In the related channel-DB the change signal and the function value are available for the user. Das
Änderungssignal dieser interrupt driven function is reset to zero in the cyclic basic program section after the
execution of at least one full OB1 cycle (max. approx. two OB1 cycles).
Tool change
With the tool-management option, the tool-change command for revolver and the tool change in the spindle is
supported by an interrupt. The local data bit "GP_TM" in OB 40 is set for this purpose. The PLC user program
can thus check the tool management DB (DB 72 or DB 73) for the tool change function and initiate the tool
change operation.
Position reached
In the bit structure, "GP_InPosition" of the local data of OB 40 is specific to the machine axis (each bit
corresponds to an axis/spindle, e.g. GP_InPosition[5] corresponds to axis 5).
If a function has been activated via FC 18 (spindle control, positioning axis, indexing axis) for an axis or spindle,
the associated "GP_InPosition" bit can be used to implement instantaneous evaluation of the "InPos" signal of
the FCs listed above. This feature can be used, for example, to obtain immediate activation of clamps for an
indexing axis.
Declaration
FUNCTION FC 3 : VOID
// no parameters
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions