Industrial Networking - Profibus

PROFIBUS BasicsDate 09/06/00, Page 1

PROFIBUS Basics

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Active Stations

Passive Stations (Field Devices)

PLCPC

PROFIBUS


PROFIBUS Basics

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All PROFIBUS servicesHigh Speed Data Exchange

Peer to Peer

Hazardous Area

can be used together in one networkTherefore Communication is Transparent for the UserSame Cable and Components for High Speed Data Exchange and Peer to Peer


PROFIBUS Basics

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High-Speed Data Exchange FeaturesSame priority for all field devices

Communication is permanent & cyclic

Amount of data specified during configuration

Only one master can write to outputs (safety aspect)

Acyclic communication to field devices possible by using extended functions (DP Extended/DPV1)

Alarm acknowledgment

Up to 244 bytes input AND 244 bytes output data per field device

Fastest fieldbus system (up to 12Mbaud)


PROFIBUS Basics

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System Configuration

PLC

PROFIBUS

GSD GSD GSD GSD GSD GSD

Plug & Play With Electronic Device Data SheetsPROFIBUS

Configuration Tool

Electronic Device Data Sheets (GSD, GSE, GSF, GSG, GSI, GSP, GSS Files)


PROFIBUS Basics

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High-Speed Data Exchange - Startup Sequence

Power ON/Reset

Power ON/Reset of Master or Slave

ParameterizationDownload of Parameters into the Field Device (selected during Configuration by the User)

I/O ConfigurationDownload of I/O Configuration into the Field Device (selected during Configuration by the User)

Data ExchangeCyclic Data Exchange (I/O Data)and Field Device reports Diagnostics


PROFIBUS Basics

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High-Speed Data Exchange - Parameterization

Master Slave

Features Implemented in DeviceDescribed in GSD FileProcessed by Configuration ToolSelected at ConfigurationExamples:

Enable Channel DiagnosticOperation Range for Analog Channels

(e.g. ±10V or 0..10V)Fail Safe Behavior (e.g. Hold Last

Value)

Parameter Download (up to 244 bytes)

= Parameterization Data = Confirmation (Data Received)


PROFIBUS Basics

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Parameterization (continued)Parameter selection with Configuration Tool

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Fewer DIP Switches - NO Handheld - NO Extensive Additional DocumentationUser defines every Function in ONE Tool.


PROFIBUS Basics

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High-Speed Data Exchange - Configuration

Master

Configuration Download (up to 244 bytes)

= Configuration Data = Confirmation (Data Received)

Possible I/O Selections described in GSD FileProcessed by Configuration ToolSelected at ConfigurationExamples

8DI (1 Byte), 8DO (1 Byte)2AI (2 Words), 2AO (2 Words)RS232 Interface, Counter Module

Slave


PROFIBUS Basics

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Configuration Tool (continued)I/O selection with Configuration Tool


PROFIBUS Basics

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PROFIBUS Demo

Parameter & I/O

Selection

Parameter & I/O

Selection


PROFIBUS Basics

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High-Speed I/O - Data Exchange & Diagnostics

Master Slave

= Output Data = Input Data

Master Slave

Slave indicates diagnostics to report

Data Exchange (up to 244 bytes)

= Diagnostic Indicator


PROFIBUS Basics

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Data Exchange & Diagnostics (continued)

Master Slave

= Diagnostic Request = Diagnostic Response

Master Slave

Data Exchange (up to 244 bytes)

Diagnostic Request and Response (up to 244 bytes)


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Diagnostic Response (continued)

6 Bytes Mandatory

Header Header Header

Device Related

(Optional)

Identifier Related

(Optional)

Channel Related

(Optional)

Up to 244 Bytes

e.g. wrong

configuratione.g. no load

powere.g. module #4

has diagnostice.g. wire break or

short circuit


PROFIBUS Basics

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High-Speed Data Exchange - Fail Safe

What happens if my bus fails:valve open, valve closed, valve 1/2 open…???

Optional feature Fail Safe specifies behavior of

Outputs in case of Communication Loss

Optional feature Fail Safe specifies behavior of

Outputs in case of Communication Loss


PROFIBUS Basics

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Fail Safe (continued)Optional Feature for Field Devices

Defined in Electronic Device Data Sheet

Manufacturer has the capability to allow the End User to specify the action on loss of communication

Hold outputs at the last value received (e.g. valve 1/2 open)Set outputs to a specified value (e.g. open or close valve completely)

User defines action during Parameterization


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Fail Safe (continued)


PROFIBUS Basics

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PROFIBUS Demo

Diagnostics & Fail Safe

Diagnostics & Fail Safe


PROFIBUS Basics

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High-Speed Data Exchange Timing10 Stations With 2 Byte I/O (160 In/Output Signals)

Bus Cycle Time 0.8ms


PROFIBUS Basics

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High-Speed Data Exchange Timing10 Stations With 128 byte I/O (10,240 In/ Output Signals)

Bus Cycle Time 2.0ms


PROFIBUS Basics

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High-Speed Data Exchange TimingTypical Cycle Time - Each Station With 2 Byte I/O

0.3 0.52.1

8.8

2.0

20.5

1.50.8

3.32.00.9

6.14.6

7.7

14.1

0.0

2.0

4.0

6.0

8.0

10.0

12.0

14.0

16.0

18.0

20.0

1 5 10 20 30 [Number ofSlaves]

[ms]

12MBaud

1.5MBaud

500kBaud


PROFIBUS Basics

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PROFIBUS SummaryExtensive Parameterization Features

Extensive Diagnostic Features

Fail-Safe Behavior

Deterministic

Fast (Up to 12 MBaud)

Safe and Reliable

Easy Configuration

Capabilities for Complete Plant Solution from Cell to Bit Level

Technology

Industrial Networking - Profibus