About the Anybus Communicator CAN
6
Doc.Id. SCM-1200-121
Anybus Communicator CAN to CANopen
Doc.Rev. 1.00
1.2.2 Data Exchange Model
Internally, the data exchanged on the subnetwork, and
the data exchanged on the higher level network, resides
in the same memory.
This means that in order to exchange data with the sub-
network, the higher level network simply reads and
writes data to memory locations specified using the
Anybus Configuration Manager. The very same mem-
ory locations can then be exchanged on the subnet-
work.
The internal memory buffer is divided into three areas
based on their function:
Note:
the Communicator supports a maximum of
1024 bytes for the input and output data, but up to 512
bytes in one direction.
• Input Data (Up to 512 bytes)
This area can be read by the higher level net-
work.
(how this data is represented on the higher level
network will be described later in this chapter).
• Output Data (Up to 512 bytes)
This area can be written to by the higher level
network.
(how this data is represented on the higher level network will be described later in this chapter).
• General Data
This area can not be accessed from the higher level network, but may be used for transfers be-
tween individual nodes on the subnetwork, or as a general “scratch pad” for data. The size of the
General Data area is 1024 bytes. How much of the area that is used for subnetwork communi-
cation is decided by the configuration.
General Data
Anybus Communicator CAN
Internal Memory
Input Data
(512 bytes)
CAN Network
Output Data
(512 bytes)
CANopen Network
