Siemens SIMATIC ET 200SP IM 155-6 PN/2 HF - Real-Time Communication; Isochronous Real-Time Communication

Product overview
2.2 Functions
Interface module IM 155-6 PN/2 HF (6ES7155-6AU01-0CN0)
Manual, 10/2018, A5E03915895-AH
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2.2.2
Real-time communication
Real-time communication
A transmission method for PROFINET IO based on cyclic data exchange with a provider-
consumer model.
2.2.3
Isochronous real-time communication
Isochronous real-time communication
A synchronized transmission method for cyclic exchange of IO data between PROFINET
devices. A reserved bandwidth within the send clock is available for the transmission. The
reserved bandwidth ensures that the IRT data is also transmitted in reserved, time-
synchronized intervals, unaffected by other high network load (e.g. TCP/IP communication or
additional real time communication).
A topology configuration is required for IRT.
Note
IO controller as sync master with IRT communication
We recommend operating the IO controller also as a sync master when configuring the IRT
communication. Otherwise, IRT
- and RT-configured IO devices may fail if the sync master
fails.
You can find more information on the configuration of synchronized PROFINET devices in
sync domains in the STEP 7 online help and
● As of STEP 7 (TIA Portal) V12, in the function manual PROFINET with STEP 7
(http://support.automation.siemens.com/WW/view/en/49948856).
● As of STEP 7 V5.5, in the system manual PROFINET System Description
(http://support.automation.siemens.com/WW/view/en/19292127).