Isochronous Mode - Siemens SIMATIC ET 200eco PN M12-L System Manual

Configuring
8.3 PROFINET IO
8.3.3

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 I/O devices support isochronous mode of I/O data to
the IO controllers starting at 250 µs. The I/O device can exchange isochronous process data
with a maximum of one IO controller.
NOTE
Restriction with STEP 7 TIA Portal
The isochronous mode function is fully usable in STEP 7 TIA Portal from V16 Update 1. In the
previous versions, it depended on the respective configuration whether and to what extent
isochronous mode could be used. If an error occurs, the I/O device rejects the configuration
with the alarm message "Parameter error".
For configuration with GSDML, select a configuration in the hardware catalog that provides
the value status (QI) in order to use isochronous mode.
Detailed information
You can find additional information on the topic of isochronous mode in the STEP 7 online
help and in the SIMATIC PROFINET with STEP 7
(https://support.industry.siemens.com/cs/ww/en/view/49948856) function manual.
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Distributed I/O system ET 200eco PN M12-L
System Manual, 11/2023, A5E48753295-AG