Configuring with STEP 7
15.1 Configuring with STEP 7
S7-400H
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System Manual, 03/2012, A5E00267695-11
15.1.4
Recommendations for setting the CPU parameters
CPU parameters that determine cyclic behavior
You specify the CPU parameters that determine the cyclic behavior of the system on the
"Cycle/Clock memory" tab.
Recommended settings:
●
As long a scan cycle monitoring time as possible (e.g. 6000 ms)
●
OB 85 call when there is an I/O area access error: only with incoming and outgoing errors
Number of messages in the diagnostic buffer
You specify the number of messages in the diagnostic buffer on the "Diagnostics/Clock" tab.
We recommend that you set a large number (3200, for example).
Monitoring time for transferring parameters to modules
You specify this monitoring time on the "Startup" tab. It depends on the configuration of the
fault-tolerant station. If the monitoring time is too short, the CPU enters the W#16#6547
event in the diagnostic buffer.
For some slaves (e.g. IM 157) these parameters are packed in system data blocks. The
transmission time of the parameters depends on the following factors:
●
Baud rate of the bus system (high baud rate => short transmission time)
●
Size of the parameters and the system data blocks (long parameter => long transmission
time)
●
Load on the bus system (many slaves => long transmission time);
Note: The bus load is at its peak during restart of the DP master, for example, following
Power OFF/ON
Recommended setting: 600 corresponds to 60 s.
Note
The specific fault-tolerant CPU parameters, and thus also the monitoring times, are
calculated automatically. The work memory allocation of all data blocks is based on a CPU-
specific default value. If your fault-tolerant system does not link up, check the data memory
allocation (HW Config > CPU Properties > H Parameters > Work memory used for all data
blocks).
NOTICE
A CP 443-5 Extended (order number 6GK7443–5DX03) may only be used for transfer rates
of up to 1.5 MBaud in an S7–400H or S7–400FH when a DP/PA or Y link is connected
(IM157, order number 6ES7157-0AA00-0XA0, 6ES7157-0AA80-0XA0, 6ES7157-0AA81-
0XA0). Remedy: see FAQ 11168943 in
Service & Support (
Содержание SIMATIC S7-400H
Страница 24: ...Preface 1 1 Preface S7 400H 24 System Manual 03 2012 A5E00267695 11 ...
Страница 46: ...Getting Started 4 5 Special layout features of SIMATIC Manager S7 400H 46 System Manual 03 2012 A5E00267695 11 ...
Страница 120: ...Memory concept 10 1 Overview of the memory concept of S7 400H CPUs S7 400H 120 System Manual 03 2012 A5E00267695 11 ...
Страница 258: ...Communication 14 8 General issues regarding communication S7 400H 258 System Manual 03 2012 A5E00267695 11 ...
Страница 354: ...Synchronization modules 18 3 Selecting fiber optic cables S7 400H 354 System Manual 03 2012 A5E00267695 11 ...
Страница 434: ...Technical data 20 6 Runtimes of the FCs and FBs for redundant I Os S7 400H 434 System Manual 03 2012 A5E00267695 11 ...
Страница 460: ...Function modules and communication processors supported by the S7 400H S7 400H 460 System Manual 03 2012 A5E00267695 11 ...