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4.3
How the Data Exchange Works
The data exchanged between the Communicator and the
serial subnetwork
and the
high level
network
resides in the Communicator internal memory buffer.
To exchange data with the
serial subnetwork
, the
high level network
reads and writes data to the
Communicator internal memory buffer.
The same memory locations are exchanged on the serial subnetwork.
The memory locations are specified when configuring the Communicator, using the
Communicator built-in web interface.
The Communicator internal memory buffer is divided into two areas: Input data and Output data.
Input Data
This
Input data area
is read by the
high level network
.
The Communicator can handle up to 1500 bytes input data.
Output Data
The
Output data area
is read/written by the
high level network
.
The Communicator can handle up to 1500 bytes output data.
4.4
Data Integrity
A snapshot of the process data buffer between the Modbus Client and the server interface is
used during the operation of executing all the transactions within one cycle.
When the cycle is completed, the process data available on the server interface is updated and a
new snapshot is created for the next cycle.
Anybus
®
Communicator
™
User Manual
SCM-1202-162 1.1 en-US
