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03/2006
6.6
System data
6.6.1
Basic settings
Control clock
The control works on the basis of clock cycles that are defined via machine
cycles
data. The system basic cycle is specified in seconds; the other cycle times are
obtained as multiples of the system basic cycle.
The clock cycles are optimized by default and should only be changed if the
requirements of the NCK cannot be met with the default values.
The following cycle times are used by default:
Table 6-10
Clock cycles – default values for the control
Cycle
840D
NCU 571
System basic
6 ms
cycle in s
Position control
6 ms
cycle as a factor
Interpolator cy-
18 ms
cle as a factor
*
with 2 channel and 12 axes
#
with > 2 channels
General example
The machine data for cycle times is set as follows:
for cycle settings
SYSCLOCK_CYCLE_TIME = 0.002
POSCTRL_SYSCLOCK_TIME_RA TIO = 1
IPO_SYSCLOCK_TIME_RA TIO = 3
Warning
!
If you have changed the clock cycles, check that the operating response of the
control is correct in all operating modes before ending the start-up process.
Switching from
A control is switched from the metric system to an inch system with
metric to Inch
MD 10240: SCALING_SYSTEM_IS_METRIC (basic system is metric).
The additional conversion factor is specified in
MD 10250: SCALING_VALUE_INCH (conversion factor for switching to the
INCH system, factor = 25.4).
After power ON the existing data is converted to inches and displayed. After
switchover data must be entered in inches.
© Siemens AG 2006 All Rights Reserved
SINUMERIK 840D/810D Start-Up Guide (IADC) – 03/2006 Edition
840D
840D
NCU 572
NCU 573
#
4 ms
4* / 8
ms
MD 10050: SYSCLOCK_CYCLE_TIME
#
4 ms
4* / 8
ms
MD 10060: POSCTRL_SYSCLOCK_TIME_RATIO
*
#
12 ms
12
/ 40
ms
MD 10070: IPO_SYSCLOCK_TIME_RATIO
If MD ... = ...
6 Programming the control
6.6
System data
Setting via MD
Then the ... = ...
System basic cycle = 2 ms
Position control cycle = 2 ms (1
Interpolator cycle = 6 ms (3 2 ms)
6
2 ms)
6-67
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