Cycle Times - Siemens SINUMERIK 840DiE sl Manual

01/2007
11.3.8

Cycle times

System basic cycle
Position controller
cycle
Position controller
cycle offset
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
On the SINUMERIK 840Di sl, the system clock cycle, the position controller
cycle and the interpolation cycle of the NCK are based on the DP cycle time
configured in STEP 7 "HW Config" (see Section 6.3, Page 6-139f).
The DP cycle time configured in STEP 7 is taken as the system clock cycle and
displayed in the machine data:
S
MD10050: $MN_SYSCLOCK_CYCLE_TIME (system clock) = DP cycle time
Note
The DP cycle time configured in STEP 7 "HW Config" is only taken as the
system clock cycle from the NCK if at least one real machine axis is
parameterized in the NCK machine data.
If no real machine axis is parameterized, the value of the machine data
functions as the system clock cycle:
S
MD10050: $MN_SYSCLOCK_CYCLE_TIME
The ratio from position controller cycle to system clock cycle for SINUMERIK
840Di sl is always 1:
S
MD10060: $MN_POSCTRL_SYSCLOCK_TIME_RATIO = 1
Note
The machine data is not displayed for 840Di sl,
The position controller cycle offset (T
tions are fulfilled within a DP cycle (T
– The cyclic communication with the DP slaves (drives) must be
completed before the position controller is started.
Condition: T > T
M
– The position controller must be completed before the DP cycle is
completed.
Condition: T + T
M
The following setting is recommended as approximate value for the position
control cycle offset:
T = T – 3*T
M DP pos max
– T
DP
The DP cycle time is equivalent to the position controller cycle of the
SINUMERIK 840Di sl.
– T
pos max
Display using HMI Advanced (optional):
Operating area switchover> Diagnosis > Service displays >
System resources
S
MD10062: $MN_POSCTRL_CYCLE_DELAY (position control cycle delay) = T
11 NCK Commissioning with HMI Advanced
) must be set so that the following condi-
M
):
DP
DX
< T
Pos DP
11.3 System data
M
11-301