Cycle Times - Siemens SINUMERIK 840Di Manual

10 NC Start-Up with HMI Advanced
10.3 System data
10.3.8

Cycle times

System clock cycle
Position controller
cycle
Position controller
cycle offset
NC:
Position controller
PROFIBUS DP
communication
DP slaves:
Drives
Fig. 10-2 Position controller cycle offset to the PROFIBUS DP cycle
10-290
On the SINUMERIK 840Di the system clock cycle, the position controller cycle,
and the interpolation cycle of the NC are based on the DP cycle time configured
in STEP7 "HW Config". See Section 7.3, page 7-211f.
The system clock cycle is set fixed to the ratio of 1:1 with regard to the DP cycle
time. In the machine data, the active value is displayed. This setting cannot be
modified.
S
MD10050: SYSCLOCK_CYCLE_TIME (system clock cycle).
The position controller cycle is set fixed to the ratio of 1:1 with regard to the sys-
tem clock cycle. This setting cannot be modified.
The position controller cycle offset (T
ditions are fulfilled within a PROFIBUS DP/system clock cycle:
– The cyclic communication with the DP slaves (drives) must be com-
pleted before the position controller is started.
Condition: T > T
M
– The position controller must be completed before the DP cycle/system
clock is completed.
Condition: T + T
M
T
M
R
T
DX
MSG RES GC Dx Dx Dx
R R R R R R R R R R R R R R R R R R
) must be set such that the following con-
M
DX
< T
Pos DP
T
DP
T
Pos
R
MSG RES GC Dx Dx
R R R R R R R R R R R R R R R R R R R R R
 Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
06.03
R
Dx
R R R R R R