Configuration In Run - Siemens SIMATIC S7 F Manual

Configuration
4.9

Configuration in Run

There are process control systems that may not be switched off during operation,
e.g. due to the complexity of the automated process, or expensive restart costs.
Nevertheless, a change or expansion of the process control system may be
required. Configuration in Run (CiR) makes this possible. The program execution
will be stopped for a certain time up to 2500 ms. During this time, the process
outputs keep their current value. In particular, in process control systems, this has
no effect on the process.
Before using the information below, please review the CiR procedures in the
manual „How to Modify the System during Operation with CiR".
Calculate the Monitoring Times
When loading a safety program, it is necessary to calculate all safety monitoring
times within the F-System including the CiR Synchronization time in order to
determine which monitoring time settings are necessary to use with CIR. If these
values are unacceptable for the process, you can recalculate the monitoring time
by reducing the CiR Synchronization Time. To reduce the CiR Synchronization
Time, you have the following possibilities:
•
reduce the amount of input and output bytes of the master system
•
reduce the amount of guaranteed slaves of the master systems to be changed
•
reduce the amount of changing master systems within one CiR event
To calculate the safety monitoring times use the spreadsheet:
\\Step7\S7BIN\S7FTIMEB.XLS
Limitation of the CiR Synchronization Time
The F-CPU compares the actual calculated CiR Synchronization Time with the
current upper limit of the CiR Synchronization Time. If the calculated value is less
than the upper limit, the CiR is carried out. The default value of the upper limit of
the CiR Synchronization Time within the CPU is 1 second. This value can be
changed by using the SFC104 to reduce or to enlarge the upper limit in the range
of 200ms to 2500ms. You can find the detailed description of the SFC 104 in the
manual "SIMATIC System Software for S7300/400 System and Standard
Functions".
Configuration of F-I/O's via CiR
With CiR you can add a new F-I/O to your System or you can delete an existing F-
I/O from your System. The following procedures show you how to do this:
Fail-Safe Systems
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