Instructions

Basic Operation 18
Doc: HMSI-27-306, Rev. 3.11Anybus Communicator PROFIBUS User Manual
2.4 Data Representation on PROFIBUS
2.4.1 General
The Anybus Communicator acts as a slave on the PROFIBUS network. As such, it does not initiate
communication towards other nodes on itself, but can be read from/written to by a PROFIBUS master.
2.4.2 Data Representation
The Input and Output Data areas in the internal memory buffer are represented as PROFIBUS I/O
data. The amount of data exchanged on the bus depends on the configuration in the gateway.
When setting up the PROFIBUS communication, make sure that the I/O sizes in the PROFIBUS mas-
ter match the actual sizes used by the gateway. The data sizes can be viewed at any time in the Subnet-
work Monitor, see “Sub-network Monitor” on page 53.
The latest version of the GSD-file for the gateway can be downloaded from the HMS website
www.anybus.com.
2.4.3 Memory Layout (Internal Memory Buffer)
The data in the input and output data areas is represented as continuous blocks of I/O data as follows:
Example:
In this example, the I/O sizes for the gateway has been set to the following values:
IO Size In = 128 bytes(0x0080)
IO Size Out= 32 bytes(0x0020)
Resulting memory layout:
Input Data Output Data General Data
0x000 0x200...0x21F
0x1FF 0x3FF
0x400
0x???
0x07F
0x080
0x220
PROFIBUS Input Data
(Not represented
on PROFIBUS)
(Not used)
(Not used)
PROFIBUS Output Data