Specifications

12 Abbreviations / Glossary 01.99
6FC5198-6AA60-0BP1 © Siemens AG 1999 All Rights Reserved
12-6 SINUMERIK 840C, OEM Version for Windows (BA)
Directory path
This specifies the position of a file in the directory hierarchy.
DRAM
(Dynamic Random Access Memory): Volatile memory chip with direct access
to each individual memory location. The locations retain their contents as long
as they are supplied with electrical power.
DRF
Differential Resolver Function: NC function that generates an incremental zero
offset in the Automatic mode with an electronic handwheel.
Drift compensation
SINUMERIK 840C has a semi-automatic drift compensation function which
compensates the drift of the drive due to temperature changes. Drift
compensation is needed in order to eliminate the permanent contour offset
which results from the accumulative following error.
EDIT key
Key on the operator panel:
In NCK areas: Edit existing values
In MMC areas: Same function as tabulator key on the MF2 keyboard
Editor
The editor allows texts/program blocks to be edited, added to, pushed together,
and inserted.
EMC
Electromagnetic compatibility is understood to mean the capability of an item
of electrical equipment to function without fault in a given environment
without having an unacceptable influence on the surroundings.
Enter box
Predefined area for entering values and texts.
EPROM
(Erasable Programmable Read Only Memory): Non-volatile programmable
memory which retains its contents even if the power is switched off.
Feed override
The programmed feedrate is modified from the machine control panel or from
the PLC (0 - 120%).
Feedforward
control
By means of the feedforward control, the velocity setpoints calculated by the
interpolator are output directly to the drive, i.e. without looping through the
position control. Inaccuracies in the contour, caused by the following error,
can be almost entirely eliminated by the dynamic, acceleration-dependent
feedforward control. This results in good machining accuracy even at high
contouring velocities.
File
Collection of data and/or text
File type
Possible types of files, e.g. part programs, zero offsets, R parameters, etc.
Flash EPROM
Non-volatile programmable memory with high memory density that retains its
contents even if the power is switched off.
Helical
interpolation
Helical interpolation is a great help in producing internal or external threads
with form cutters and for milling lubrication groups. The helical path is made
up of two motions:
• Circular motion in a plane
• Linear motion perpendicular to this plane.