Startup - Siemens SINUMERIK 840D sl Function Manual

G3: Cycle times

3.2 Startup

3.2 Startup
Parameter assignment
system clock cycle, position control cycle and interpolator cycle are defined with the following
machine data:
MD10050 $MN_SYSCLOCK_CYCLE_TIME (system clock cycle)
MD10060 $MN_POSCTRL_SYSCLOCK_TIME_RATIO (factor for position-control cycle)
MD10070 $MN_IPO_SYSCLOCK_TIME_RATIO (factor for the interpolation cycle)
MD10050, $MN_SYSCLOCK_CYCLE_TIME sets the system clock cycle of the system
software in seconds. The other time cycles are derived by multiplying the system clock cycle
with the factor specified in the concerned machine data:
Default values
Cycle
Basic system cycle
Position control cycle
Interpolator cycle
* with 2 channels and 12 axes
#
with > 2 channels
The default settings ensure that a maximum configuration of the system can power up
reliably.
The cycle times, e.g. for the NCU 573, can generally be set to the lower values.
Example of cycle settings
The machine data is assigned as follows:
MD10050 = 0.002
MD10060 = 1
MD10070 = 3
182
840D 840D
NCU 571 NCU 572
6 ms 4 ms
6 ms 4 ms
18 ms 12 ms
This results in the following cycle times:
⇒ system clock cycle = 2 ms
⇒ Position control cycle = 1 * 2 ms = 2 ms
⇒ Interpolator cycle = 3 * 2 ms = 6 ms
840D
NCU 573
4* / 8
4* / 8
*
12 / 40
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
#
ms
#
ms
#
ms
Special Functions