Data Exchange Model - Anybus Communicator CAN PROFINET IRT 2.32 User Manual

Description
2.3

Data Exchange Model

2.3.1 Overview
The data exchanged on the CAN subnetwork and the data exchanged on the higher level net-
work reside in the same internal memory in the Anybus Communicator CAN. In order to ex-
change data with the CAN subnetwork, the higher level network simply reads and writes data to
memory locations that have been specified in Anybus Configuration Manager. The same mem-
ory locations can then be exchanged on the CAN subnetwork.
Fig. 3 Memory buffer structure
The internal memory buffer is divided into three areas based on their function:
Input Data (220 bytes)
Output Data (220 bytes)
General Data
(up to 1024 bytes)
2.3.2 Memory Map
When building the CAN subnetwork configuration in Anybus Configuration Manager the areas
in the memory buffer will be mapped to the following memory locations:
0x000
CAN Network:
Fieldbus:
0x0DB
Fig. 4 Memory Map
The illustration shows the maximum available data areas in Anybus Communicator CAN. The
actual amount of memory that can be allocated depends on the fieldbus network used.
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Anybus Communicator ™ CAN PROFINET
This area can be read from by the higher level network.
This area can be written to by the higher level network.
This area cannot be accessed by the higher level network but can be used
for transfers between 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 that area
that will be used for communication depends on the configuration.
Input Data
0x200
Write Only
Read Only
0x2DB
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IRT (2.32) User Manual
Internal Memory
Input Data
(220 bytes)
Output Data
(220 bytes)
General Data
Output Data
0x400
CAN Network: Read Only
Fieldbus: Write Only
0x7FF
7 (30)
General Data
CAN Network: Read/Write
Fieldbus: -
SCM-1202-035 1.0