A
Appendix 03.04
B Terms
Contour monitoring
The following error is monitored within a defined tolerance band to
ensure contour precision. An impermissibly high following error might
be caused by a drive overload, for example. In this case an alarm is
triggered and the axes are stopped.
Coordinate system
See -> machine coordinate system,
-> workpiece coordinate system
CPU
Central Processor Unit, -> Programmable Logic Controller
Cutter radius
compensation
Contour programming assumes that the tool is pointed. As this is not
actually the case in practice, the curvature radius of the tool used
must be communicated to the control, which then takes it into
account. The curvature center is maintained equidistantly around the
contour offset by the radius of curvature.
Cycle
Protected subroutine for executing a repetitive machining process on
the -> workpiece.
Cycle support
In the "Program" operating area, the available cycles are listed under
the menu "Cycle Support". After selecting the desired machining cycle
the required parameters for the value assignment are displayed in
clear text.
D
D number
Number for the tool offset memory
Data block
1. Data unit of the -> PLC, which the -> HIGHSTEP programs can
access.
2. Data unit of the -> NC: Data blocks contain data definitions for
global user data. These data can be initialized directly when they
are defined.
Data transmission
program PCIN
PCIN is an auxiliary program which is used to send and receive CNC
user data via the serial interface, such as e.g. parts programs, tool
offsets etc. The PCIN program can be executed under MS-DOS on
standard industrial PCs.
Data word
A data unit, two bytes in size, within a -> data block.
Diagnostics
1. Control operating area
2. The control has both a self-diagnostics program and testing aids
for service. Status, alarm and service indicators.
Digital input/output
module
Digital modules are signal formers for binary process signals.
Siemens AG, 2004. All rights reserved.
A-148 SINUMERIK 840D/840Di/810D Operator’s Guide Handheld Terminal 6 (BAH) - 03.04 Edition
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