Siemens SINUMERIK 840C Installation Instructions Manual page 276

07.97
NC MD 7
Var. Mode
increment group
for DRF spec. sin-
5004
(as from gle block,
SW 6) type B
Default value: All 0
Bit 7 Bit 7=0 (Default) The DRF increment is equal to 1.
Bit 7=1 This activates the function "Variable increment for DRF offset". The value in
the "INC variable" setting data is activated as the DRF increment.
Active:
Bit 6 The first channel to process a block sets the remaining channels in the same
mode group to STOP. The axes that were halted are put into motion on the
next Start. The channel that initiated the Stop begins with the next block. Type
B single block.
Active:
Bit 5 The next NC Start is effective only when all channels in the same mode group
have processed their blocks and the axes are at a standstill. Type A single
block.
Active:
Bit 4 Bit 4=0 Feed override effective for rapid
Bit 4=1 Own rapid override via DB 10-13 DR1 effective for rapid
Override is activated by selecting the appropriate softkey and FB 78 or
DB 10 ... 13 DR 1 bit 5
Bit 3 The PLC signal "NC START" (DB 10-17 DR2 bit 0) initiates a program start,
even if the reference points have not been approached, at least not for all
axes, i.e. the feed axes have not been synchronized with the machine position.
MD 560* bit 4 is irrelevant in this case. In order to ensure correct workpiece
machining, synchronization must be carried out in another form, such as
through use of the scratch method.
Active:
Bit 1,0 The number of available handwheels is specified as follows:
Active:
Bit
One handwheel
Two handwheels
©
Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
Bit No.
6 5 4
Mode
Own rapid
group
traverse
spec. sin-
override
gle block,
type A
Immediately
In the next block
In the next block
NC Stop
NC Stop
1 0
0 1
1 1
6FC5197- AA50
6.6.1 General MD bits (general bits)
3 2 1
NC Start 2nd
without
ref.point
handwheel available
all axes
0
1st
6–91