Introduction; What Is Profibus-Dp - Leroy-Somer digitax st User Manual

2

Introduction

2.1

What is PROFIBUS-DP?

PROFIBUS-DP (Decentralized Peripheral) is a networking system that falls into the
generic category of fieldbus. Fieldbuses are generally defined as industrial networking
systems that are intended to replace traditional wiring systems. Figure 2-1 shows the
traditional cabling requirements to transfer signals between 2 slaves and a master.
Figure 2-1 Traditional cable layout
Table 2.1 details how the wiring is used to communicate data between the master and
the slaves. Each signal that is communicated requires one signal wire giving a total of
66 signal wires plus a 0V return.
Table 2.1 Traditional wiring details
Number of
signals
16
16
1
16
16
1
A fieldbus topology such as PROFIBUS-DP allows the same configuration to be
realized using only two signal wires plus a shield. This method of communication saves
significantly on the amount of cabling required and can improve overall system reliability
as the number of interconnections is greatly reduced.
8
Hardwired master
Digital 1A
Analog 1
Type Source / Destination
digital Inputs slave 1 to master
digital outputs master to slave 1
analog output master to slave 1
digital inputs slave 2 to master
digital outputs master to slave 2
analog output master to slave 2
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Analog 1 Analog 2
Digital 1B Digital 2A Digital 2B
SM-PROFIBUS DP-V1 User Guide
Analog 2
Description
status signals
control signals
control signal
status signals
control signals
control signal
Issue : a