Installation of a CPU 41x-H
4-33
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Determining the Bus Topology in a DP Master System with the SFC 103 “DP_TOPOL”
The diagnostics repeater is provided to improve the ability of locating disrupted
modules or an interruption on the DP cables when failures occur in ongoing
operation. This module is a slave that determines the topology of a DP strand and
records any faults originating from it.
You can use SFC 103 “DP_TOPOL” to trigger the analysis of the bus topology of a
DP master systems by the diagnostics repeater. SFC 103 is documented in the
corresponding online help and in the manual “System and Standard Functions”.
The diagnostics repeater is documented in the manual “Diagnostics Repeater for
PROFIBUS DP”, order number 6ES7972-0AB00-8BA0.
System Modifications During Ongoing Operation
Some system configuration modifications can be made in the RUN state even
when an H CPU is being operated in single mode. Processing is halted for a
maximum of 2.5 seconds (configurable). The process outputs maintain their
current value during this time. This has practically no effect on the process
especially in processing engineering systems. See also the manual “Modifications
to the System During Operation Using CiR”
System modification during ongoing operation can only be made for distributed I/O.
It requires the type of configuration shown in the following illustration. To simplify
the representation only one DP master system and only one PA master system are
shown.
Modular
DP slave
ET200M,
ET200S
or
ET200iS
Compact
DP slave
IM 157+
DP/PA
coupler
PA slave
(field de-
vice)
SUBNETWORK: PA master
system
DP Master
MPI/DP interface of a CPU 41x or DP in-
terface of a CPU 41x-2 or
external DP interface module CP 443-5
ext.
PROFIBUS: DP master system
PA link
PA slave
(field de-
vice)
Figure 4-6 Overview: system configuration for modification of the system during operation
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