Instructions

Frame Objects 38
Doc: HMSI-27-306, Rev. 3.11Anybus Communicator PROFIBUS User Manual
7.5 Data Object
Data Objects are used to represent raw data as follows:
• Produce/Query Transactions
The specified data block is forwarded from the higher level network to the sub-network.
• Consume/Response Transactions
The specified data block is forwarded from the sub-network to the higher level network.
To specify the properties of the object, select it in the Navigation Section and enter the desired settings
in the Parameter section as follows:
7.6 Variable Data Object
Note: Only one Variable Data Object is permitted for each transaction.
This object is similar to the Data Object, except that it has no predefined length. Instead, an End or
Length-character specifies the size of the data block as follows:
• Produce/Query Transactions
The specified data block will be forwarded from the higher level network to the sub-network.
The control system must supply an End or Length character in order for the gateway to know
the size of the data block.
The End- or Length-character itself may either be forwarded to the sub-network or discarded.
• Consume/Response Transactions
The specified data block is forwarded from the sub-network to the higher level network. The
End- or Length-character will be generated by the gateway automatically (if applicable).
The End- or Length-character itself may either be forwarded to the higher level network or dis-
carded.
Parameter Description
Byte Swapping • No Swapping
No swapping is performed on the data
• Swap 2 bytes
A, B, C, D becomes B, A, D, C
• Swap 4 bytes
A, B, C, D becomes D, C, B, A
Data Length The length of the data block, in bytes. In case of a Response or Consume transaction, incom-
ing messages where the data size differs from the value specified here will be discarded. Max-
imum data length allowed for one frame is 300 bytes.
Data Location The location of the data block in the internal memory buffer.
4 bytes of data
(Variable Data Object)
Length Character
0x04 Data
Data of arbitrary length
(Variable Data Object)
End Character
0x00Data