Siemens SIMATIC ET 200SP Manual page 18

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Product overview

2.2 Functions

Isochronous mode of I/O data

I/O data, transmission cycle via PROFINET IO, and the user program are synchronized to

achieve maximum deterministics. The input and output data of distributed I/O modules in the

system is simultaneously collected and simultaneously output. The constant PROFINET IO

cycle forms the corresponding clock generator. The interface module supports isochronous

mode of I/O data for the modules starting at 250 µs. The IO device can exchange

isochronous process data with up to one IO controller.

Note

If the IO controller cannot access a module (for example, module pulled, activated

configuration control without written control data record), cycle time violations may occur with

activated isochronous mode in isochronous mode interrupt OB (OB61). The time error OB

(OB80) is called in the event of a cycle time violation.

This behavior is associated with updating the process image by means of the "SYNC_PI"

(SFC126) and "SYNC_PO" (SFC127) instructions and depends, among other things, on the

set cycle time and the configuration limits.

Note

Isochronous mode restrictions with IM 155-6 PN HF

Isochronous mode of I/O data in combination with the following functions is not possible with

the interface module IM 155-6 PN HF:

• Shared Device

• PROFIenergy

You can find more information on this topic in the STEP 7 online help and

● As of STEP 7 V12, in the PROFINET with STEP 7 V13

(http://support.automation.siemens.com/WW/view/en/49948856) function manual.

● As of STEP 7 V5.5, in the system manual PROFINET System Description

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

IM 155-6 PN HF interface module (6ES7155-6AU00-0CN0)

Manual, 03/2015, A5E03915895-AF

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