Technical data

Appendix 1: Technical Data of the CPUs in the S5-135U
Operation / processing CPU 922 CPU 928 CPU 928B
Typical operation execution times for bit operations:
with
F, I, Q
D
formal operands
22
µs
37
µs
46
µs
1
µs
34
µs
25
µs
0.57
µs
3.4
µs
2.4
µs
Typical operation execution times for word operations:
- load operations
L FY (byte)
L FW (word)
L FD (double word)
15
µs
15
µs
20
µs
12
µs
12
µs
16
µs
0.81
µs
0.94
µs
1.6
µs
- fixed point arithmetic
- floating point arithmetic
26 ... 50
µs
51 ... 86
µs
13 ... 24
µs
29 ... 69
µs
0.94 ... 10
µs
9.1 ... 23
µs
Cyclic program execution (single processor mode)
Basic time calling OB 1/FB 0:
107/119
µs 147/149 µs 170/172 µs
Additional time for updating the
process image dependent on the
number of I/O bytes (n)
where 0 < n
≤128
33
µs
+ n * 6
µs
18
µs
+ n * 1.58
µs
18
µs
+ n * 2.13
µs
Additional time for transfer of
IPC flags depending on the
number of IPC flags (n)
where 0 < n
≤ 256
35
µs
+ n * 6.5
µs
19
µs
+ n * 1.84
µs
n
≤ 128:
18
µs
+ n * 2.38
µs
n > 128:
36
µs
+ n * 2.38
µs
Additional time for timer
processing depending on the
timer field length (TFL)
TFL =0
every 2.5 ms
50
µs
every 10 ms
5 µs
every 10 ms
1 µs
TFL #0
n = number of currently
active timers (time base: 10 ms)
60
µ s
+ TFL * 1.56
µs
+ n * 1.24
µs
200
µs
+ n * 0.35
µs
(where
0 <n
≤ 128)
400
µs +
n * 0.35
µs
(where
128 < n
≤ 256)
20
µs
+ ZBL * 1
µs
(no difference
between active
and inactive
timers)
Appendix 1: Technical Data of the CPUs in the S5-135U
CPU 928B Programming Guide
12 - 4 C79000-A8576-C898-01