Product overview
2.2 Functions
Interface module IM 155-6 PN/2 HF (6ES7155-6AU01-0CN0)
24
Manual, 10/2018, A5E03915895-AH
2.2.8
Isochronous mode
Isochronous mode
The input and output data of distributed I/O modules in the system is simultaneously
acquired and simultaneously output. For this purpose, the I/O data, the transmission cycle
via PROFINET IO, and the user program are synchronized. 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 a maximum of one IO controller.
Note
When the module is pulled or no written control data record has been written with activated
configuration control, the IO controller cannot access a module. In this case, cycle time
violations may occur with activated isochronous mode in the synchronous cycle 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. It depends on the set cycle time and the
configuration limits.
You can find additional information 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 system manual PROFINET System Description
http://support.automation.siemens.com/WW/view/en/19292127
2.2.9
Module-internal Shared Input/Shared Output (MSI/MSO)
Module-internal Shared Input/Shared Output (MSI/MSO)
The Module-internal Shared Input function allows an input module to make its input data
available to up to four IO controllers. Each controller has read access to the same channels.
The Module-internal Shared Output function allows an output module to be operated by up to
four IO controllers. One IO controller has write access. Up to three additional IO controllers
can have read access to the same channels.
You can find more information on this topic in the STEP 7 online help and:
●
As of STEP 7 V12, in the function manual PROFINET with STEP 7
http://support.automation.siemens.com/WW/view/en/49948856
●
As of STEP 7 V5.5, in the system manual PROFINET System Description
Содержание SIMATIC ET 200SP IM 155-6 PN/2 HF
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