Siemens SINUMERIK 840C User Manual
Page 284
01.99
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.1 General MD bits (general bits)
7
6
5
4
3
2
1
0
Bit No.
NC MD
5012
Do not
delete work-
piece name
with PLC
program
selection (as
from SW 3)
Write MD
disabled
by @
Sign change
handwheel 2
(as from
SW 6.3)
Sign change
handwheel 1
(as from
SW 6.3)
Default value:
All 0
Active:
In the next block
Bit 3
If the bit is set, the workpiece name is not deleted with program selection via
FB 62.
Bit 2
Bit 2 can be used to inhibit entry and modification of NC MD, PLC MD and
cycles MD using @ commands @4.. (CL800 commands).
Bit 1 Bit 1=1 Leads to a sign change of handwheel 2
Bit 0 Bit 0=1 Leads to a sign change of handwheel 1
7
6
5
4
3
2
1
0
Bit No.
NC MD
5013
Circle
program-
ming
Polar
coordinate
program-
ming
Feed not
contour-
related
M and S
address
extension for
spindle to PLC
Tapping
without
encoder
G63 without
feedrate
reduction
Default value:
1000 0000
Active:
In the next block
Bit 7 Bit 7=1 When bit 7 is set, a circle can be programmed by specifying the radius and/or
angle.
Bit 6 Bit 6=1 Positions related to a set mid-point can be defined by programming polar
coordinates using details of radius and angles.
Example 840C (M):
Bit 4 Bit 4=0 The programmed feedrate refers to the contour.
F 1000
F 1000
F 1000
Bit 4 Bit 4=1 The programmed feedrate of the milling tool refers to the tool center path.
F 1000
F 1000
F 1000
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Siemens AG 1992 All Rights Reserved 6FC5197- AA50
6–99
SINUMERIK 840C (IA)