Siemens SINUMERIK 840Di, Руководство пользователя

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06.03
10.3 System data
10-290

Siemens AG, 2003. All rights reserved
SINUMERIK 840Di Manual (HBI) – 06.03 Edition
10.3.8 Cycle times
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
M
) must be set such that the following con-
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
M
> T
DX
– The position controller must be completed before the DP cycle/system
clock is completed.
Condition: T
M
+ T
Pos
< T
DP
Dx Dx Dx GC MSG RES MSG
DP slaves:
Drives
NC:
Position controller
T
M
T
DP
RES GC
PROFIBUS DP
communication
Dx Dx Dx
T
DX
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
T
Pos
R R R
Fig. 10-2 Position controller cycle offset to the PROFIBUS DP cycle
System clock cycle
Position controller
cycle
Position controller
cycle offset
10 NC Start-Up with HMI Advanced