Siemens ET 200pro Operating Instructions Manual page 306

Interface modules
12.2 Interface modules for PROFINET IO
● The following properties are available with the specified firmware version and higher in
conjunction with CM IM PN M12 7/8" (6ES7194-4AJ00-0AA0) or CM IM PN PP Cu
(6ES7194-4AF00-0AA0):
Firmware version
With 6.0.0 and higher
With 7.0.0 and higher
Isochronous real time communication
Synchronized communication protocol for cyclic exchange of IRT data between PROFINET
devices. A reserved bandwidth within the send clock is available for the IRT data. The
reserved bandwidth ensures that the IRT data can be transmitted at reserved, synchronized
intervals while remaining uninfluenced by another greater network load (for example, TCP/IP
communication or additional real time communication).
● IRT option "high flexibility":
Maximum flexibility in planning and extending the system. Topological configuration is not
required.
● IRT option "high performance":
Topological configuration is required.
Note
IO controller as a sync master for IRT communication with the option "high performance"
We recommend also operating the IO controller as a sync master if you configure the IRT
communication with the option "high performance".
Otherwise, IRT and RT configured IO devices may fail if the sync master fails.
For further information about configuring synchronized PROFINET devices in sync domains,
refer to the STEP 7 online help and the PROFINET System Description
(http://support.automation.siemens.com/WW/view/en/19292127) manual.
306
Properties
Isochronous real time communication "high flexibility"
Prioritized startup
Device replacement without PC
Changing IO devices during operation (changing partner ports)
Isochronous real time communication "high performance"
Media redundancy
Shared device
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08