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Description of the Architecture

Introduction to PROFIBUS on Industrial PC

C79000-G8976-C068

3.5.3 The DP Protocol

The distributed peripheral I/Os (abbreviated to DP) allow you to use a

large number of distributed analog and digital input/output modules in

the immediate vicinity of the process.

Networking DP components using PROFIBUS means a considerable

reduction in cabling compared with previous direct wiring of the

components.

Large distances between the individual I/O devices can be bridged by

PROFIBUS (PROFIBUS). Distributed I/O stations collect the input

signals locally and these are then fetched by the central controller in

the computer. The central controller also sends output data to the

distributed I/O stations cyclically.

The DP protocol is intended for time-critical applications. An optimized

and simplified transmission protocol means high transmission rates

and the use of a master-slave structure results in short cycle times.

The DP protocol is based on the communications standard for the field

area (PROFIBUS EN 50 170) EN 50 170. The concept of DP

communication was worked out in a common project undertaken by

leading manufacturers of automation equipment. It describes a

heterogeneous transmission protocol tailor-made for the requirements

of the field area.

The main characteristics of the distributed peripheral I/O system are as

follows:

•

Central control by one master.

•

High data throughput thanks to a simple transmission protocol.

•

Cyclic transmission of the process image in the input and output

direction.

•

Simple, cost-effective network attachment.

•

Data transmission with the option of twisted-pair (RS 485) or fiber-

optic cables.

•

Detection of errors with on-line diagnostics.

•

Based on EN 50 170, allowing parallel operation with FMS devices

(masters and slaves) on one bus.

Distributed I/Os

Main

Characteristics

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