Siemens SIMATIC S7-400H System Manual page 362

S7-400 cycle and response times
19.2 Calculating the cycle time
Table 19- 6 Portion of the process image transfer time, CPU 417-5H
Portion
K Base load
A In the central controller
*)
Read/write byte/word/double word
B In the expansion unit with local link
*)
Read/write byte/word/double word
C In the expansion unit with remote link
*)**)
Read/write byte/word/double word
D1 In the DP area for the integrated DP interface
Read byte/word/double word
D2 In the DP area for the external DP interfaces
***)
Read/write byte/word/double word
E1 Consistent data in the process image for the integrated DP
interface
Read/write data
E2 Consistent data in the process image for the external DP
interface (CP 443–5 extended)
Read
write
F In the PNIO area for the integrated PROFINET interface
Read/write for each byte/word/double word
G Per submodule with 32 bytes of consistent data for the
integrated PROFINET interface
In the case of I/O inserted into the central controller or expansion device,
*)
the specified value contains the execution time of the I/O module
The module data is updated with the minimum number of accesses.
(example: 8 bytes result in 2 double word accesses; 16 bytes in 4 double word accesses.)
Measured with IM460-3 and IM461-3 at a link length of 100 m
**)
Measured with modules with 1 byte of user data, e.g. DI 16.
***)
Extending the cycle time
The calculated cycle time of a S7-400H CPU must be multiplied by a CPU-specific factor.
The table below lists these factors:
Table 19- 7 Extending the cycle time
Start-up 412–5H
stand-alone
mode
Factor 1.05
Long synchronization cables may increase cycle times This extension can have the factor 2 -
5 with a cable length of 10 km.
362
412–5H 414–5H
redundant stand-alone
mode
1.2 1.05
CPU 417–5H
stand-alone mode
3 µs
7.3 µs
20 µs
45 µs
0.4 µs
5 µs
8 µs
80 µs
60 µs
2 µs
8 µs
414–5H 416–5H
redundant stand-alone
mode
1.2 1.05
CPU 417–5H
redundant
4 µs
15 µs
26 µs
50 µs
10 µs
15 µs
30 µs
100 µs
70 µs
15 µs
30 µs
416–5H 417–5H
redundant stand-alone
mode
1.2 1.05
System Manual, 03/2012, A5E00267695-11
417–5H
redundant
1.2
S7-400H