Skip to main content


Isochronous Mode Guideline



This Guideline provides information about the isochronous mode that is tightly related to the communication with equidistant cycle of data exchange that is provided by PROFINET and its RT Class 3 type of service. This information is additional to formal description of state machines and services of the isochronous mode that are provided in PROFINET specification “Application Layer services for decentralized periphery”. Thus, the intended reader is a developer of devices and controllers, which support isochronous mode as a functionality above the isochronous communication mechanisms. This Guideline also contains information for engineering system developers that concern especially the timings and other parameters, whose correct setting is a prerequisite for the isochronous operation.

Version: 1.0
Order No.: 7.192
Language: English


New draft for PI-Review:

Version: d1.2
Order No.: 7.192
Language: English



This draft is published for testing and review only. It must not be used for development purposes.

Comments to be submitted to  until December 17, 2021.

The difference to V1.0 is marked in blue in the draft document.



This area is for members only. Please login to access this download.
# Date Filename Type Size
04/08/2016 IsoM_7192_v10_Jun16.pdf pdf 764 KB
17/09/2021 IsoM_7192_d12_Sep21.pdf pdf 1 MB

Our well-known PI technologies


PROFIBUS is a standardized, open, digital communications system for all areas of application in manufacturing and process automation.


PROFINET is the innovative open standard for Industrial Ethernet. It satisfies all requirements of automation technology.

IO-LINK is an independent sensor / actuator interface solution for use with all automation technologies.



Omlox is an open technology standard for real-time indoor localization systems for industrial manufacturing.