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Design and Function

14/79 ekr CON 600 net – Process Data Exchange via Profibus

2.3.3 Process Data Structure

Two different types of data traffic are used for the communication

between the Profibus Master (customer control system) and the

Slave (ekrCON600net web guiding controller):

Data Traffic Utilisation

Cyclic data traffic

High-speed exchange of process data

(real-time data)

Acyclic data traffic

Parameterization of the controller,

status requests, device identifications, …

2.3.3.1 Cyclic Data Traffic

The data exchange between the Profibus class1 master and the

slaves is mainly cyclic. The necessary communication functions are

established by the Profibus-DP basic functions.

The cyclic data traffic is used for the real-time exchange of process

data. The cyclic data traffic between the Profibus class1 master

(customer control system) and the slaves assigned to it (e.g.

ekrCON600net web guiding controller) is automatically handled

by the master in a specified, recurring sequence. When configur-

ing the bus system, the user defines the affiliation of a slave to the

Profibus class1 master (DPM1). Furthermore it is defined which

slaves are included and which are excluded from the cyclic useful

data traffic.

The data traffic between the Profibus class 1 master and the

slaves is divided into the parameterization, configuration and data

transfer phases. Before a Profibus slave is included into the data

transfer phase, the master checks during the parameterization

and configuration phases whether or not the planned target con-

figuration complies with the actual device configuration. To pass

this test, the device type, the format and length information as

well as the number of inputs and outputs must tally. The user thus

is securely protected against parameterization errors.

In addition to the description in this document, the data that is

cyclically exchanged between the ekr CON 600 net web guiding

controller and the customer control system is also described in

the supplied GSDML file (see GSD File, page 19).

BST ekr CON 600 net Translation Of The Original Manual

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