Siemens SINUMERIK 840D Operator's Manual page 482

Hmi advanced
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A
Appendix
B
Terms
I
I/O module
Identifier
Inch system of
measurement
Increment
Incremental dimension
Initialization block
Initialization file
Intermediate blocks
Interpolative
compensation
A-482
I/O modules create the link between the CPU and the process. I/O
modules are:
· ->Digital input/output modules
· ->Analog input/output modules
· ->Simulator modules
In accordance with DIN 66025, identifiers (names) for variables
(arithmetic variables, system variables, user variables), for
subroutines, for vocabulary words and for words can contain several
address letters. These letters have the same meaning as the words in
the block syntax. Identifiers must be unique. Identical identifiers must
not be used for different objects.
System of measurement that defines distances in "inches" and
fractions thereof.
Travel path length specification based on number of increments. The
number of increments can be stored as a -> setting data or selected
with keys labeled with 10, 100, 1000, 10 000.
A destination for axis traversal is defined by a distance to be covered
and a direction referenced to a point already reached. See also ->
absolute dimension.
Initialization blocks are special -> program blocks. They contain
values which must be assigned before the program is executed.
Initialization blocks are used primarily for initializing predefined data or
global user data.
An initialization file can be created for each -> workpiece. In it, the
various variable value instructions which apply exclusively to one
workpiece can be stored.
Movements with selected tool offset (G41/G42) can be interrupted by
a limited number of intermediate blocks (blocks without axis motions
in the offset plane). When such blocks are used, the tool offset can
still be calculated correctly. The permissible number of intermediate
blocks read in advance by the control can be set via system
parameters.
Interpolative compensation provides a means of compensating for
leadscrew errors (LEC) and measuring-system errors (MSEC)
resulting from the production process.
SINUMERIK 840D/840Di/810D Operator's Guide HMI Advanced (BAD) – 03.04 Edition
A
03.04
Ó Siemens AG, 2004. All rights reserved

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