Siemens SINUMERIK 840Di sl - Dynamic Response

NC Commissioning with HMI Advanced
11.7 Digital and analog I/O devices
Manual
472 Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
11.7.5 Dynamic response
After the system variables have been set, e.g. $A_OUT[8] for setting the 8th digital output of
the NC on a SIMATIC S7 signal module connected via the PROFIBUS DP, the system
variable is transferred from DP master to the signal module via the PROFIBUS DP during
the next position controller cycle.
The signal module will then provide the signal to the appropriate with the output next output
cycle. The PROFIBUS DP cycle and the cycle of the signal module are not synchronized
during this process.
The described transfer cycle is illustrated in the following diagram.
The dynamic response while importing a digital or analog input are similar to the properties
described above.
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Figure 11-32 Dynamic response when outputting an output signal with optimized DP-Cycle
Explanations for the figure:
● T
MAPC
Master application cycle: NC-Position controller cycle
the following is always valid for SINUMERIK 840Di sl: T
MAPC
= T
DP
● T
DP
DP cycle time: DP cycle time
● T
DX
Data exchange time: Total transfer time for all DP slaves