Product overview
2.2 Functions
IM 155-5 PN HF Interface Module (6ES7155-5AA00-0AC0)
16 Manual, 10/2018, A5E32840985-AB
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.
Note
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, 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
Prioritized startup denotes the PROFINET functionality for accelerating the startup of IO
devices operated in a PROFINET IO system with RT communication.
The function reduces the time that the correspondingly configured IO devices require to
return to the cyclic user data exchange in the following cases:
● After the supply voltage has returned
● After a station has returned
● After activation of IO devices
Note
Dependency of the startup time
The startup time depends on the number and type of modules. You can
Inserting no more than 12 I/O modules
Inserting no power supply module.
The prioritized startup function with the requirements listed in the note above is not available
for IRT communication and media redundancy.
To Next Page
Loading...
