Product description
User manual 58185_TREE M4/6-TX PN IP20_hdb_en_10
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Fig. 3-6: Structure of the conformance classes
CC-A
CC-A
offers basic functions for PROFINET IO with RT communication. Typical
cycle time starting at 2 ms. In this case, unmanaged switches can be used,
too. Wireless communication is possible only in this class. All
TREE-managed
PROFINET switch
devices conform with this class. The TREE unmanaged
switches by MURRELEKTRONIK can be used as switches.
CC-B
CC-B
enhances the concept by the inclusion of network diagnosis and topol-
ogy information. Typical cycle time starting at 2 ms. The topology information
and projected device names enable easy device exchange. The defective de-
vice can be easily exchanged with a new device with factory settings. All
TREE-managed PROFINET switch
devices conform with this class. Al-
though the TREE unmanaged switches by Murrelektronik are transparent for
this information (LLDP protocol), they are not involved in the diagnosis and to-
pology information. If the switch is to be integrated in the topology of the PLC,
a PROFINET managed switch is required. The CC-B(PA) includes the impor-
tant system redundancy function as an extension to the CC-B which is re-
quired for process automation.
CC-C
CC-C
describes the basic functions for devices with hardware-supported
bandwidth reservation and synchronization (RT communication) and therefore
forms the basis for isochronous applications. The implementation of Isochro-
nous Real Time (IRT) in Ethernet controllers makes it possible to reach update
times of 250 μs and a jitter accuracy of less than 1μs.
