Hello

What is isochronous mode mode and 

When we use this?

Thank you.

Hello,

I think used with Profinet f.ex. try find somewhere here on forum relevant documentation, maybe examples are also available.

Hello,

Kindly have a look at the attached file.

 Isochronous mode with PROFINET

Overview:

The isochronous mode is always used in the SIMATIC S7-1500 when multiple parameter values which are comparable or in a relationship to one another are to be processed in one cycle. This requirement is fulfilled, for example, in the following scenarios.

 Simultaneous acquisition of multiple measured values which are to be acquired via various input modules.

 Execution of control processes on the SIMATIC S7-1500 CPU in which the acquisition of the measured values and output of the actuator signals is via various modules.

 Coherent control of multiple drives via the drive functions integrated in the SIMATIC S7-1500.

Function:

The coherent acquisition of multiple measured values in one program cycle is taken as an example for demonstrating the isochronous mode.

Also used for Profibus, Chapter 5:

https://support.industry.siemens.com/cs/attachments/59193579/profibus_step7_v13_function_manual_en-US_en-US.pdf?download=true

RetroK

When we use this?

When the negative answer to the question "is the response time of a PLC constant?" starts to drive you crazy.