Siemens SINUMERIK 840D Operator's Manual page 152

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Appendix
B Terms
Initialization block
Initialization files
Interconnecting cables
Intermediate blocks
Interpolator
Interpolatory
compensation
interrupt routine
Inverse-time feedrate
I/O module
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and a direction referenced to a point already reached. See also ->
absolute dimension.
Initialization blocks are special -> program blocks. They contain value
assignments which are performed before program execution.
The primary purpose of initialization blocks is to initialize predefined
data or global user data.
It is possible to create an initialization file for each -> workpiece.
Various variable assignments which are intended to apply specifically
to one workpiece can be stored in this file.
Interconnecting cables are 2-wire cables with 2 connector plugs which
are either pre-fabricated or need to be fabricated by the user himself.
These interconnecting cables connect the -> CPU via the -> multipoint
interface (MPI) with a -> programming device or other CPUs.
Traversing movements with tool offset selected (G41/G42) can be
interrupted by a limited number of intermediate blocks (block without
axis movements in the compensation plane) whereby the tool offset
can still be correctly calculated. The permissible number of
intermediate blocks which the control reads ahead can be set in
system parameters.
Logical unit of the -> NCK which determines intermediate values for
the movements to be traversed on the individual axes on the basis of
destination positions specified in the parts program.
Interpolatory compensation can be used to compensate for leadscrew
errors and measuring system errors (LEC, MSEC) caused during
production.
Interrupt routines are special -> subroutines which can be started on
the basis of events (external signals) in the machining process. A
parts program block which is currently being worked through is
interrupted and the position of the axes at the point of interruption is
automatically saved.
With the SINUMERIK FM-NC and 840D, it is possible to program the
time required to traverse the path of a block instead of programming
the feedrate for the axis movement (G93).
I/O modules represent the link between the CPU and the process. I/O
modules are:
• ->Digital input/output modules
• ->Analog input/output modules
• ->Simulator modules
SINUMERIK 840D/840Di/810D Operator's Guide Handheld Terminal 6 (BAH) - 03.04 Edition
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03.04
 Siemens AG, 2004. All rights reserved.