Siemens SINUMERIK 840DE Programming Manual page 482

Glossary
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 transfer program PCIN
PCIN is an auxiliary program, which is used to send and receive CNC user data via the serial
interface, such as 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,
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 611D converter
system by means of a high-speed digital parallel bus.
Dynamic feedforward control
Inaccuracies in the contour caused by following errors can be almost entirely eliminated with
the aid of dynamic, acceleration-dependent feedforward control. The result is extraordinary
machining precision even at high tool path feed-rates. The feedforward control can be
individually selected and deselected for each axis in the parts program.
Glossary-6
data can be initialized directly when they are defined.
alarm and service indicators.
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals