Siemens SIMATIC ET 200AL System Manual page 2147

High-speed analog modules
8.1 Basics
Cycle time of an analog input module
If you have configured the system property "Isochronous mode" for HS modules, all analog
input modules are synchronized to a shared time within the send clock (cycle)
time is made up of the following time intervals: t
①
②
t
Z
t
1
t
2
t
3
t
4
t
W
Figure 8-3
116
Synchronization time for all analog input modules in isochronous mode and simultaneously
time of the converted input signal at the terminal in this cycle
Digitalized input signal is transferred to the backplane bus
Cycle time
Time between cycle start and synchronization
Hardware-related runtime up to the analog-digital converter
Processing time of digitalized input data in the module
Transfer time of the backplane bus
Conversion time of the module
Cycle time of the analog input module
= t + t + t + t
Z 1 2 3 4
Function Manual, 06/2014, A5E03461439-AC
①
. The cycle
Analog value processing