Siemens SINUMERIK 840Di sl Programming Manual page 532

Glossary
Data word
A data unit, two bytes in size, within a -> data block.
Diagnosis
1. Control operating area
2. The control has both a self-diagnostics program and testing aids for service. Status,
Digital input/output module
Digital modules are signal formers for binary process signals.
Dimensions in metric units and inches
Position and gradient values can be entered in the machining program in inches. The control
can be set to a basic system regardless of the programmed measuring system (G70/G71).
DRF
Differential Resolver Function: An NC function which generates an incremental zero offset in
automatic mode in conjunction with an electronic handwheel.
Drive
The SINUMERIK 840D control system is connected to the SIMODRIVE 611 digital converter
system by means of a high-speed digital parallel bus.
Dynamic feedforward control
Inaccuracies in the → contour due to following errors can be virtually eliminated using
dynamic, acceleration-dependent feedforward control. This results in excellent machining
accuracy, even at high → path velocities. Feedforward control can be selected and
deselected on an axis-specific basis via the → part program.
Editor
The editor is used to create, modify, add to, compress, and insert programs/texts/program
blocks.
Electronic handwheel
The electronic handwheels can be used to simultaneously traverse selected axes manually.
The meaning of the lines on the handwheels is defined by the external zero offset increment
weighting.
532
alarm and service indicators.
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
Fundamentals