dl-breadcrumbs__homedl-breadcrumb-item__separatorConfiguration and programmingdl-breadcrumb-item__separatorSystem technologydl-breadcrumb-item__separatorSystem technology of CPU and overall systemdl-breadcrumb-item__separator...dl-breadcrumb-item__separatorSystem processingdl-breadcrumb-item__separatorSystem start-up / Program processingdl-breadcrumb-item__separatorPLC utilizationdl-breadcrumb-item__separatorThe „Default“ priority schema in “SystemFW” 3.4.1
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The „Default“ priority schema in “SystemFW” 3.4.1dl-permalink__symbolPermalink

The default value of the boot-parameter ‎Communication Schema‎ is the balanced priority for communication via communication modules (CMs) and onboard Ethernet communication.

Fig. 384: Overview about the main task priorities in the PLCs
Com_Schema_Default

The highest IEC task priority 0 should be used for high prior functions in the PLC with short execution time.

The communication modules interrupts (CM5xx), the I/O bus, the IEC scheduler observer task and the CAA event task are processed with higher priority than all user IEC tasks.

Ethernet runs on non-real-time priority.

The default setting of the priorities is suitable for most applications and corresponds to the settings in the firmware versions 3.4.0 and before.