Configuration Notes
The CiR function (Configuration in RUN) allows system expansion during operation. You can make modifications to plant during operation with CiR in sections of plant with a distributed I/O.

In order to make modifications to plant during operation with CiR you must use one of the modules below as PROFIBUS DP master:

• Integrated MPI/DP interface or integrated DP interface of an S7-400 CPU
• External DP master interface CP443-5 EXT from V5.0
• Interface module IF 964-DP

Using the CiR system you can add or remove compact DP slaves, for example third-party slaves, and the modular DP slaves ET 200M, ET 200iSP and ET 200S to/from an existing PROFIBUS DP master system.

Permissible configuration changes with compact DP slaves
You can add/remove a compact DP slave to/from a PROFIBUS DP master system only as a complete station.

Permissible configuration changes with modular DP slave ET 200M
You can use the CiR function to add/remove the DP slave ET 200M as a complete station to/from a PROFIBUS DP master system. Furthermore, with the modular DP slave ET 200M you can use the CiR function to add and remove individual modules or change their parameters.

Permissible configuration changes with modular DP slave ET 200iSP
You can use the CiR function to add/remove the modular DP slave ET 200iSP as a complete station to/from a PROFIBUS DP master system. In addition, with the modular DP slave ET 200iSP you can use the CiR function to change the parameters of individual modules. You can use the CiR function to replace reserve modules with the coming electronic modules of the ER 200isp.

Permissible configuration changes with the modular DP slave ET 200S
You can use the CiR function to add/remove the modular DP slave ET 200S only as a complete station to/from a PROFIBUS DP master system.
Using the CiR function to add individual modules to the existing modular DP slave ET 200S is not supported to date. If you need additional individual modules in the existing modular DP slave ET 200S, you must first remove the complete station using the CiR function. Then you use the CiR function to add the modular DP slave ET 200S with the additional modules required as a complete station to the PROFIBUS DP master system.
Option handling provides another way of preparing the ET 200S for coming extensions (options). Option handling means, for example, that you assemble, wire and configure the planned maximum configuration of the ET 200S. You can use option handling with or without RESERVE modules.
More information about the Option Handling function with the ET 200S is available in Entry ID: 22564754.

Further Information
More information about the CiR function is available in the manual "SIMATIC STEP7 V5.5 Modifying the System during Operation via CiR" in Entry ID: 45531308.

Information about using the "Configuration in Run" (CiR) function on the PROFINET IO system is available in Entry ID: 49245734.