Siemens SIMATIC ET 200AL, System Manual

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Diagnostics and maintenance
4.9 Maintenance
PROFINET with STEP 7
Function Manual, 05/2021, A5E03444486-AL
109
AM_Location
Asset management at PROFINET supports two formats for coding the location of an asset:
•
Slot-oriented format ("Slot and SubslotNumber format")
• Hierarchical format ("Twelve L evel T ree format" abbreviated LT format)
Assets that are part of the PROFINET device use the slot-oriented format. These assets are
bound completely to the PROFINET modules and submodules.
Assets that are located outside the PROFINET device use the hierarchical format (LT format)
for coding the location of an asset.
These assets are localized by their tree level. The tree level begins with Level 0. The value of
Level 0 provides information about the proximity to the PROFINET device:
•
If the asset is connected to a module that can be addressed through the PROFINET device
model, Level 0 has the value 0. The subsequent levels (Level 1 to Level 3) then have the
meaning of slot address, subslot address and channel number. If further assets are
connected to this asset, the next Level 4 is used. The limit is reached at Level 11.
• If the asset belongs to a PROFINET device but is not connected to a module that can be
addressed through the PROFINET device model, Level 0 has a value between 1 and 0x1FF.
An example of such an asset is a power supply unit in the PROFINET device. If a further
asset is connected to this power supply unit, for example a sensor, the next tree level is
used to localize this sensor (Level 1).
• If the asset is located outside the PROFINET device, but, for example, belongs to a machine
into which the PROFINET device is installed, Level 0 has a value between 0x200 and
0x3FE.
The value 0x3FF for a tree level shows that this tree level is not used. This means that no
further asset is connected. In this case, all the lower tree levels down to Level 11 must also
have this value.