Siemens Simatic S7-1500 Manuel - Page 15

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Isochronous real-time communication

Synchronized communication protocol 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 V14

(https://support.industry.siemens.com/cs/ww/en/view/49948856) function manual.

● as of STEP 7 V5.5 in the PROFINET System Description

(http://support.automation.siemens.com/WW/view/en/19292127) manual.

Interface module IM 155-5 PN ST (6ES7155-5AA01-0AB0)

Manual, 11/2017, A5E03612323-AC

Product overview

2.2 Functions