Werbung
Verfügbare Sprachen
Verfügbare Sprachen
CPU 414-4H / CPU 417-4H
Note
The STEP 7 Reference Information documentation package still contains the reference
manual with edition 08/2000 (paper version). The STEP 7 V5.1 SP3 product CDs contain the
electronic manual with edition 11/2001.
Process Image Updating
In contrast to the information in the current S7-400, M7-400 Programmable Controllers, Module
Specifications reference manual the transfer time for process image updating is calculated as
follows:
K
+ Component in central rack (from line A in the following table)
+ Component in expansion rack with local link (from line B)
+ Component in expansion rack with remote link (from line C)
+ Component via integrated DP interface (from line D)
+ Component consistent data via integrated DP interface (from line E1)
+ Component consistent data via external DP interface (from line E2)
= Transfer time for process image updating
The following table contains the individual transfer time components for process image
updating (process image transfer time). The times listed are "ideal values" that may increase by
the occurrence of interrupts or by CPU communication.
Components
n = Number of bytes in the process
image
m= Number of accesses in the process
*)
image
k= Number of consistency ranges in the
process image
K
Basic load
A
In the central rack
**)
Read byte/word/double word
Write byte/word/double word
14
CPU 414-4H
CPU 417-4H
solo
20 ms
20 ms
(m * 23 + n * 1.9) ms
(m * 28 + n* 1.9) ms
(m * 17 + n * 1.9) ms
(m * 20 + n * 1.9) ms
CPU 414-4H
CPU 417-4H
redundant
A5E00073168-07
Werbung
