Table 16-4 Portion Of The Process Image Transfer Time, Cpu 414-4H - Siemens SIMATIC S7-400H System Manual

Table 16-4 Portion of the process image transfer time, CPU 414–4H
Allocation
n = number in bytes in the process image
m = number of accesses to process image
K Base load
A In central unit
**)
Read/write byte/word/double word
B In expansion unit with local link
**)
Read/write byte/word/double word
C In expansion unit with remote link
**)***)
Read/write byte/word/double word
D In the DP area for the integrated DP interface
Read byte/word/double word
D 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 data
The module data is updated with the minimum number of accesses.
*)
(e.g.: 8 bytes result in 2 double word accesses, and 16 bytes in 4 double word accesses.)
In the case of I/O inserted into the central unit or into an expansion unit,
**)
the specified value contains the execution time of the I/O module
Measured with IM460-3 and IM461-3 at a link length of 100 m
***)
S7-400H
System Manual, 09/2007, A5E00267695-03
CPU 414–4H
stand-alone mode
*)
8 µs
m * 8.5 µs
m * 23 µs
m * 58 µs
m * 1.3 µs
m * 5.2 µs
n * 0.66 µs
n * 2.5 µs
S7-400 cycle and reaction times
16.2 Calculating the cycle time
CPU 414–4H
redundant mode
9 µs
m * 25.7 µs
m * 40 µs
m * 64 µs
m * 21.5 µs
m * 24.6 µs
n * 3.1 µs
n * 6.5 µs
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