Siemens SINUMERIK 840D Operator's Manual page 474

A
Appendix
B Terms
B Terms
A
A spline
Absolute dimension
Acceleration with jerk
limitation
Access rights
Activate/deactivate
Address
Alarms
A-474
Important terms are listed below in alphabetical order, accompanied
by explanations. Cross-references to other entries in this glossary are
indicated by the symbol "->".
The A spline runs tangentially through the programmed interpolation
points (3rd degree polynomial).
A destination for an axis movement is defined by a dimension that
refers to the origin of the currently active coordinate system. See also
-> incremental dimension.
In order to obtain the optimum acceleration gradient for the machine
while providing effective protection for the mechanical components,
the machining program offers a choice between instantaneous
acceleration and continuous (smooth) acceleration.
The CNC program blocks and data are protected by a 7-level system
of access restrictions:
· Three password levels for system manufacturers, machine
manufacturers and users and
· Four keyswitch settings which can be evaluated via the PLC.
Working area limitation is a means of restricting the axis movement
over and above the restrictions imposed by the limit switches. A pair
of values delimiting the protected zone area can be specified for each
axis.
An address is the designation for a specific operand or operand area,
e.g. input, output, etc.
All -> messages and alarms are displayed in plain text on the operator
panel. Alarm text also includes the date, time and corresponding
symbol for the reset criterion.
Alarms and messages are displayed separately.
1. Alarms and messages in the parts program
Alarms and messages can be displayed directly from the parts
program in plaintext.
2. Alarms and messages from PLC
Alarms and messages relating to the machine can be dis-
played from the PLC program in plaintext. No additional function
block packages are required for this purpose.
SINUMERIK 840D/840Di/810D Operator's Guide HMI Advanced (BAD) – 03.04 Edition
A
03.04
Ó Siemens AG, 2004. All rights reserved