07.97 6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.1 General MD bits (general bits)
2ndNC Start
without
ref.point
all axes
Var.
increment
for DRF
(as from
SW 6)
Mode
group
spec. sin-
gle block,
type B
Mode
group
spec. sin-
gle block,
type A
Own rapid
traverse
override
1st
7 6 5 4 3 2 1 0
Bit No.
NC MD
5004 handwheel available
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: Immediately
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: In the next block
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: In the next block
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: NC Stop
Bit 1,0 The number of available handwheels is specified as follows:
Active: NC Stop
Bit 1 0
One handwheel
Two handwheels 0
11
1
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Siemens AG 1992 All Rights Reserved 6FC5197- AA50
6–91
SINUMERIK 840C (IA)