Anybus Module Objects 96 (258)
Description
This command is only supported by Anybus CompactCom 40 devices.
This command is equivalent to Map_ADI_Write_Area, but can map more than 256 bytes of data. It supports
mapping fractional byte size types, and it can be used to map only specific parts of an ADI.
It maps an ADI as Write Process Data. If successful, the response data contains the offset, in bits, for the
mapped ADI from the start of the Write Process Data area.
• Mapping an ADI more than once (i.e. map it multiple times to the Read- or Write Process Data, or map it
to both the Read- and Write Process Data) is not accepted by all networks.
• It is not allowed to mix mapping commands Map_ADI_Read/Write_Area and Map_ADI_Read/Write_
Ext_Area within one area (Read/Write).
• It is recommended to only map one item for each mapping command during initial development, since
data area offset is only given for the first mapping item, and all mapping items may be rejected using one
single error code.
• All mapped elements, except those of types BIT1-BIT7 and PADx, must be byte aligned.
• The only implicit padding done is from the very last mapped item up to byte alignment, since the process
data needs to be of byte size when the setup is complete.
• Explicit padding is done either through available ADI elements of PADx type, or through the imaginary
ADI 0, which is assumed to be an array with 255 elements of type PAD1. Explicit padding of process data
is the only correct use of ADI 0. Padding bits might not be visible on the network.
• This command may permanently alter the state of the Anybus CompactCom 40 PROFINET IRT even
though the command is returned with an error. Network specific restrictions may lead to n mapping items
to be accepted, but with an error on mapping item n+1. If so, the mappings up to and including n will be
accepted, but all other mapping items, starting with n+1, are rejected. The number of accepted mappings
is declared in CmdExt[ 0 ] of the answer.
• Certain Anybus implementations allow the network to remap the Process Data during runtime. (Consult
the general Anybus CompactCom 40 Software Design Guide, Application Data Object (FEh) for further
information.)
See also...
Anybus CompactCom 40 Software Design Guide, Application Object (FFh)
Error control is only performed on the command parameters. The Anybus module does not verify
the correctness of these parameters by a read of the actual ADI attributes.
Anybus
®
CompactCom
™
40 PROFINET IRT Network Guide SCM-1202-023 EN 1.8
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