Siemens SIMATIC S7-400H System Manual page 359

Process image update
The table below shows the time a CPU requires to update the process image (process
image transfer time). The specified times only represent "ideal values", and may be
extended accordingly by any interrupts or communication of the CPU.
Calculation of the transfer time for process image update:
K+ portion in the central controller (from row A in the following table)
+ portion in the expansion device with local connection (from row B)
+ portion in the expansion device with remote connection (from row C)
+ portion via integrated DP interface (from row D1)
+ portion via external DP interface (from row D2)
portion of consistent data via integrated DP interface (from row E1)
+ portion of consistent data via external DP interface (from row E2)
+ portion in PN/IO area for the integrated PROFINET interface (from row F)
+ portion for each submodule with 32 byte of consistent data for the integrated PROFINET
interface (from row G)
= Transfer time for process image update
The tables below show the various portions of the transfer time for a process image update
(process image transfer time). The specified times only represent "ideal values", and may be
extended accordingly by any interrupts or communication of the CPU.
Table 19- 3 Portion of the process image transfer time, CPU 412-5H
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
S7-400H
System Manual, 03/2012, A5E00267695-11
S7-400 cycle and response times
19.2 Calculating the cycle time
CPU 412–5H
stand-alone mode
10 µs
9.5 µs
24 µs
48 µs
0.75 µs
6.0 µs
28 µs
250 µs
70 µs
CPU 412–5H
redundant
13 µs
35 µs
50 µs
75 µs
35 µs
40 µs
70 µs
300 µs
115 µs
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