Siemens SINUMERIK 840C User Manual
Page 278
07.97
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.1 General MD bits (general bits)
Bit 4
Keyswitch lock for input disable GI
Bit 4=1 Keyswitch setting=0: not possible to program gear interpolation (ELG) via
input display.
Keyswitch setting 0: programming of gear interpolation (ELG) via input
display possible.
Bit 4=0 Keyswitch locking not possible.
Active: immediately
Bit 3
Input of part programs over the operator panel (EDIT, INPUT, CANCEL)
Bit 2
To select dry run feedrate (DRY RUN)
Bit 1
When traversing via handwheel in Automatic mode (DRF function)
Bit 0
Entry of H, S, M, T and D functions in OVERSTORE submode
7
6
5
4
3
2
1
0
Bit No.
NC MD
5007
TO in
diameter
Do not
include tool
wear
Mixed pro-
gramming
G90/91 in
block
Tool basic
dimension
active
No output
of M17
G53 as
@706
Length
compensa-
tion for non-
program-
med axes
Default value:
0000 0100
Active for all bits:
In the next block
Bit 7 Bit 7 = 0
The cutter (tool parameter P1 = 20) is defined as length (P2) and radius
(P4). Consider also NC MD 5008, bit 4.
Bit 7 = 1
The cutter is defined as length and diameter. The cutter radius is always
over radius.
Bit 6
This bit can be used to declare all tool wear data invalid. The tool wear
data (P5 to P7) are thus available for user-specific purposes. A value can
be added to or subtracted from the tool geometry data using the "EDIT"
key.
Bit 5
In a part program, the manner in which programmed values are to be
interpreted, i.e. whether they are to be regarded as absolute (G90) or
incremental (G91) values, always relates to a whole block (up to LF).
Setting bit 5 to 1 makes it possible to define how each separate
programmed value of an axis is to be interpreted as absolute (G90) or
increment (G91) (for further details on interpolation parameters and angles
see NC MD 5003, bits 4 and 5).
Whether he programmed zero offsets G58/G59 are calculated absolutely
or additively also depends on the setting of bit 5.
©
Siemens AG 1992 All Rights Reserved 6FC5197- AA50
6–93
SINUMERIK 840C (IA)