Frame Objects
7-4
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 enter the desired settings in
the Parameter section as follows:
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.
Data Location
The location of the data block in the internal memory buffer
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