Product overview
3.3 Functions
Interface module IM 155-5 MF HF (6ES7155-5MU00-0CN0)
Equipment Manual, 11/2023, A5E53268530-AA
25
Isochronous real-time communication
Synchronized transmission method for cyclic exchange of IRT data between PROFINET
devices. A reserved bandwidth is available in the send cycle for IRT data. The reserved
bandwidth ensures that IRT data can be transferred at reserved synchronized intervals,
without being influenced by other network loads (e.g. TCP/IP communication or additional
real-time communication). A topological configuration is required for IRT.
IO controller as sync master with IRT communication
We recommend operating the IO controller as sync master when configuring IRT
communication. Otherwise, IO devices with IRT and RT configuration could fail as a result of
sync master failure.
You can find additional information on configuration of synchronized PROFINET devices in
sync domains in the STEP 7 online help and
• As of STEP 7 V12 (TIA Portal), in the PROFINET with STEP 7
(http://support.automation.siemens.com/WW/view/en/49948856) function manual
• As of STEP 7 V5.5, in the PROFINET System Description
(http://support.automation.siemens.com/WW/view/en/19292127) manual
Cabling with fixed connection setting
If you set a fixed connection setting of the port in STEP 7, you should also deactivate
"Autonegotiation/Autocrossover".
You can find additional information in the STEP 7 online help and
• As of STEP 7 V12 (TIA Portal), in the PROFINET with STEP 7
(http://support.automation.siemens.com/WW/view/en/49948856) function manual
• As of STEP 7 V5.5, in the PROFINET System Description
(http://support.automation.siemens.com/WW/view/en/19292127) manual
Device replacement without topological configuration
The device name is also stored on the BusAdapter in addition to the interface module. A
device name stored in the BusAdapter is required for device replacement without topology
configuration.
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