Siemens SINUMERIK 840C User Manual
Page 204
09.01
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.2 General machine data (general data)
Dead time for calculation for extended thread
164
Default value
Lower input limit
Upper input limit
Units
36
28 (SW 5 and higher)
–
48
1/8 of the IPO
cycle
Active
–
This machine data is preset by the system and should not be altered by the user. The function
EXTENDED THREADING PACKAGE is required.
Drive basic cycle time
168
Default value
Lower input limit
Upper input limit
Units
16
8 * 4 (as from SW 4)
32
62.5
µ
s
Active on
Power On
MD 168 is set as the first MD. MDs 155 + 160 are dependant on MD 168, i.e. the input
resolution of MD 155 is determined by MD 168.
Permissible values:
8, 10, 12, 16, 32
If the machine data contains a value for the drive basic cycle time which is outside the
permissible range, the NC software automatically enters the default value 16 (1 ms) during
start up. The value is automatically entered in the machine data.
Note:
In the case of the 840C, the drive basic cycle time must be set to 1 ms or 2ms, taking the
larger value of 2 ms for a large number of axes.
Maximum tool wear P7
209
Default value
Lower input limit
Upper input limit
Units
999 999
1
999 999
999 999.99
(as from SW 4)
0.00001
Active
at once
Maximum tool wear P5, P6
208
Active
at once
NC MD 208 and 209 can be used to restrict the maximum value in the tool offset wear
memory. Specification of 999 999 limits the maximum entry in tool wear memory to 9.99999
units.
Entries made via the Input and Edit keys are subjected to a limit check.
Number of TO areas
210
Default value
Lower input limit
Upper input limit
Units
1
1
4
–
Active
see below
Note
The TO memory can be subdivided into as many as four TO areas for pallet changing or dual-
slide machines, the advantage being that the individual TO areas can be invoked for the
various channels over D-numbers D0 to Dx, i.e. the slides on a dual slide machine can
interchange programs, as both tool turrets can be referenced over D-numbers D0 to D8.
It may prove practical as a protective measure to prevent certain channels from accessing
specific TOs.
_______
*
The lower limits only apply if the control is operated from a channel.
©
Siemens AG 1992 All Rights Reserved 6FC5197- AA50
6–19
SINUMERIK 840C (IA)