Siemens SIMATIC ET 200SP Manual page 31

Overview of the operating modes
Function
Isochronous mode
● Shortest send clock
Oversampling
● Number of oversampling levels
(sampling rate)
● Shortest sub-cycle
(= shortest sampling time)
Hardware interrupt
Filter functions
± 320 mV/V
Overflow/underflow
Short circuit/wire break at U
Load voltage diagnostics
Value status (QI)
Address space
Sampling interval
The duration of a subcycle is the sampling interval. The cycle time T (send clock) for
isochronous mode is specified in the configuration software. This time, divided by the
configured sampling rate n
Example calculation:
Figure 6-1
Analog input module AI 2xSG 4-/6-wire HS (7MH4134-6LB00-0DA0)
Manual, 09/2018, A5E41867508A-AB
Rn
Sample
Example of calculating the sampling interval
Normal operation
Yes, optional
● 125 µs isochronous
● 100 µs non-
isochronous
No
-
-
x
x
x
x
x
x
x
16 bytes
, yields the sampling interval t
Parameters/address space
6.4 Oversampling
Oversampling
1-channel opera‐ 2-channel opera‐
tion
Yes, required
125 μs
Yes
2 ...14
100 μs
-
x
x
x
x
x
x
32 bytes
of the module.
Sample
tion
2 ... 6
29