Special functions of a CPU 41x
3.3 System modifications during operation
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
3-7
3.3 System modifications during operation
3.3.1 Basics
Overview
The option of making system changes using CiR (Configuration in RUN), makes it possible
to implement certain configuration changes in RUN. Processing of the process is held for a
short period of time. The upper limit of this period of time is set to 1 s as default but can be
changed by the user. During this time, process inputs retain their last value (see also
"Modifying the System during Operation via CiR"
manual).
You can download this manual free of charge from the Internet at the following address:
http://www.siemens.com/automation/service&support
System modifications during operation with CiR can be made in plant sections with
distributed I/O. Such changes are only possible with the configuration as shown in the figure
below. To ensure clarity, we assume a single DP master system and a single PA master
system. These restrictions do not, however, exist in reality.
DP master
DP slave
ET 200M
DP slave
IM 157 +
DP/PA
PA slave
PA slave
ET 200iSP
or
Coupler
DP/PA link
SUBNET: PA master system
(field devices)
(field devices)
PROFIBUS: DP master system
MPI/DP interface of a CPU 41x or
DP interface of a CPU 41x-2 or
Interface module IF 964-DP or
External DP connection CP 443-5 ext.
Compact
Modular
Figure 3-2 Overview: System structure for system modifications during operation
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