Instructions

Basic Operation 13
Doc: HMSI-27-306, Rev. 3.11Anybus Communicator PROFIBUS User Manual
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 An-
ybus Configuration Manager. The very same memory
locations can then be exchanged on the subnetwork.
The internal memory buffer is divided into three areas
based on their function:
Note: the gateway supports a maximum of 416 bytes
for the input and output data, but up to 244 bytes in
one direction.
• Input Data (Up to 244 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 244 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 actual size
of this area depends on the amount of data that is exchanged on the subnetwork. The gateway
can handle up to 1024 bytes of General Data.
2.2.1 Memory Map
When building the subnetwork configuration using the Anybus Configuration Manager, the different ar-
eas described above are mapped to the memory locations (addresses) specified below.
General Data
ABC Internal Memory
Input Data
(244 bytes)
Subnetwork
Output Data
(244 bytes)
Higher Level Network
Input Data Output Data General Data
Subnetwork: Subnetwork: Subnetwork:
Fieldbus:
Read/Write
Read Only
Read Only
Read/Write
Read/Write
- Fieldbus: Fieldbus:
0x000 0x200
0x0F3 0x2F3
0x400
0x???