System Modifications During Operation; Basics - Siemens SIMATIC S7-400 Manual

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"
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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
Figure 3-2
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
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.
PROFIBUS: DP master system
Modular
DP slave
ET 200M
or
ET 200iSP
Overview: System structure for system modifications during operation
3.3 System modifications during operation
manual).
IM 157 +
DP/PA
Coupler
DP/PA link
Compact
DP slave
Special functions of a CPU 41x
SUBNET: PA master system
PA slave
(field devices)
PA slave
(field devices)
3-7