Siemens Sinumerik 840D sl Programming Manual page 194

Glossary
Cycle support
The available cycles are listed in the "Cycle support" menu in the "Program" operating area.
The required parameters for the assignment of the values are displayed in plain text after the
desired execution cycle has been selected.
Data block
● The unit of data used in the -> PLC which can be accessed via -> HIGHSTEP program.
● Unit of data in the -> NC: Data blocks that contain data definitions for global user data.
Data word
Data unit inside a -> PLC data block having a size of 2 bytes
Deletion of distance-to-go
Command in a part program with which the machining is stopped and the distance-to-go is
deleted.
Diagnostics
● Operating area of the control.
● The control system contains a self-diagnostics program and test routines for service:
DRF
Differential Resolver Function. This is a function of NC in which an incremental work offset is
created in the automatic mode in conjunction with the electronic handwheel.
Dynamic feedforward control
The "Dynamic acceleration-dependent precontrol" function can be used to fully overcome the
contour inaccuracies that result from secondary faults. The precontrol function enables an
extremely high degree of machining accuracy at high tool path velocities. The precontrol
function allows selection or deselection of all axes with just one part program.
Editor
The editor is used to create, change, add, connect and insert programs/texts/blocks of a
program.
Electronic handwheel
The selected axes can be operated simultaneously in manual mode with an electronic
handwheel. The handwheel clicks are evaluated by the increment analyzer.
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This data can be initialized directly during its definition.
Status, alarm and service displays.
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling