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Description of the Architecture

Introduction to PROFIBUS on Industrial PC

C79000-G8976-C068

Figure 3.5 shows the basic structure and the components of a

PROFIBUS-DP system controlled by a computer with a PROFIBUS

communications processor installed.



DP slaves

Other stations

DP master with PROFIBUS CP

PROFIBUS

DP master/slave communication

Master/master communication

Process

Figure 3.5 Basic Structure

The PROFIBUS standard EN 50 170 defines two classes of station on

the bus:

•

Passive stations

•

Active stations

In the distributed I/O system, the I/O devices are passive stations.

They are known as

DP-Slaves

. The DP slaves are controlled by an

active master station. This master station is known as the

DP master

The DP programming interface allows the use of a PROFIBUS CP in a

PG/PC as a DP master class 1. The PC in conjunction with the

PROFIBUS CP controls communication with the distributed I/O

devices and handles the central functions of a DP master class 1

according to EN 50 170. This involves the following functions:

•

Initialization of the DP system.

•

Parameter assignment/configuration of the DP slaves.

•

Cyclic data transfer to the DP slaves.

•

Monitoring the DP slaves.

•

Preparing diagnostic information.

The DP Interface of

a PROFIBUS CP

Definition of

DP Slave and

DP Master

DP Programming

Interface

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