Introduction to the Communication Application

At a Glance

The communication application makes it possible to exchange data between different devices connected to a bus or a network.

This function applies to :

Communication Types

The different communication types are:

Available Services

The available services can be classified into three categories:

WARNING

UNEXPECTED APPLICATION BEHAVIOR - DATA EXCHANGE COMPATIBILITY

Data structure alignments are not the same for Premium/Quantum and M340 PLCs so verify that the data exchanged are compatible.

See the page DDT: Mapping rules for more information.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

Characteristics of the Different Service Types

The following table gives an overview of the main characteristics of the types of services mentioned above:

Type of service	These services make it possible ...	They are used ...
Messaging services	for a device (Client) to send a message to another device (Server) and obtain a response without having to program anything into the server device.	to access data from time to time.
Implicit database access services	to share data which is refreshed automatically and on a regular basis.	to synchronize applications or to transparently obtain real-time images of a system on several remote PLCs
Implicit I/O management services	to transparently and automatically manage remote I/Os on a network.	to monitor a set of distributed systems across a network.