Profibus

Industrial Communication

Introduction

●

Profibus = PROcess FIeld BUS

●Initialized in 1987 by the German Ministry for Research and Technological Development.

●Now managed by an association of PROFIBUS Manufacturers, Users and

research institutions

●More than 1100 members worldwide (Profibus International) ●More than 1100 members worldwide (Profibus International)

●

Conforms to standard EN 50 170

●

3 Versions of Profibus

Profibus Versions

Layers Used in ISO Model

●

3 Layers used for Profibus

APPLICATION Cyclical and Acyclical data services

PRESENTATION Not used

SESSION Not used

SESSION Not used

TRANSPORT Not used

NETWORK Not used

DATALINK Serial link Master/Slave or Token Ring if multimaster

Physical Layer

●

RS485 or Fiber Optic

●

Baudrate from 9.6 Kbps to 12 Mbits

●

Max distance without Repeaters: Depends on the Baudrate

Bit rate

19.2 Kb/s 6 Mb/s

93.75 Kb/s 12 Mb/s

●

Maximum number of stations: 32 without repeaters, 122 with 3

repeaters

●Address range : 1 to 125

●Address 126 : reserved for address assignment via the bus

●Address 127 : reserved for broadcast and multicast

93.75 Kb/s 12 Mb/s

Connections

●

SubD 9 or Open Connector

VP* (6) B (3) VP* (6) B (3) 390 Ω Data line B 390 Ω B (3) A (8) DGnd* (5) B (3) A (8) DGnd* (5) 220 Ω 390 Ω 220 Ω 390 Ω A (8) B (3) Device 2 A (8) B (3) Data line A Device 3

Link Layer

●

Passive stations (slaves) uses the master-slave concept.

●Master polls the slaves one by one.

●The transmit message send to the slaves is called « PPO » (Parameter

Process Object).

●

Active stations communication is based on the token ring concept.

Frame Transmission

●

Up to 244 bytes of user data in one frame

●

Security mechanisms

●

Security mechanisms

● Start delimiter and End delimiter

● Parity bit

● Slip-free synchronization

● Frame Sequence Check (CRC)

Profibus Distributed Peripherals (DP)

●

3 Types of Stations

●DP Master Class1 (DPM1): Programmable controllers (PLC, PC, etc…)

●DP Master Class2 (DPM2): Development or diagnostic tool

●DP Slave: Peripheral device performing cyclic exchanges with its active station

●

3 Types of Profiles

●DP-V0: basic functionality of DP, including cyclic data exchange (implicit

exchanges) station, module and channel-specific diagnostics

●DP-V1: DP-V0 features + on request data communication for parameter

assignment (explicit exchange) alarm handling

●DP-V2: for isochronous mode and data exchange broadcast (slave-to-slave communication, dedicated for motion control)

Application Profile

●

Device Variable & Profile Defined in GSD File

●General specifications

●Information on vendor and device names, Hardware & software versions, supported transmission rates …

●Master specifications

●Contain all master related parameters, such as: the maximum slave

●Contain all master related parameters, such as: the maximum slave number that can be connected, or upload and download options.

● Or slaves specifications

● Contain all slave related specifications such as: the number and type of

I/O channels, diagnostic texts & information on the available modules in the modular devices case.

Standardized Profiles

●

IO Profiles Defined by the Organization

●Profibus provides some profiles depending of the application to define an interoperability between similar devices for different vendors.

●Examples:

●PROFIdrive (Speed drive device) ● Low-voltage switchgear

● Low-voltage switchgear

● Encoders

● Panel devices (HMI)

•ATV71

Data Exchanged

●

Fixed Mapping

●

PKW

●Reach any other data

Bytes 0 & 1 Bytes 2 & 3 Bytes 4 & 5 Bytes 6 & 7 INPUT PERIODIC Bytes 0 & 1 Bytes 2 & 3 Bytes 4 & 5 PKW Bytes 0 & OUPUT

●

Explicit Exchange

●Read / Write requests ●DPV1 only ! Bytes 6 & 7 Bytes 8 & 9 PKW Bytes 0 & 1 PKW Bytes 2 & 3 PKW Bytes 4 & 5 PKW Bytes 6 & 7 APERIODIC PKW Bytes 0 & 1 PKW Bytes 2 & 3 PKW Bytes 4 & 5 PKW Bytes 6 & 7

Configuration Parameters

●

Parameter Telegram

●Configuration of the device thanks to the fieldbus

Programming Modbus with Unity Pro

PRM: Profibus Remote Master

●

Not a Simple Gateway

●Standalone Profibus Master

●Polled by any Unity based PLC with IO Scanning

●

Configuration in the DTM Browser

●Configuration of the Master

●Configuration of the Master

●Configuration of Slave (3rd _{party DTM can be added)}

●

Automatic IO Scanning Line & IODDT Variable Creation

●Program it as it was an in rack module

●

3 Compatible DTMs

●Master DTM

●Generic Profibus Device DTM

Hardware Description

●

4 leds for PRM and PROFIBUS diagnostic

●

Embedded dual port Ethernet switch

●Daisy chain (loop in a next step) ●2 status led / port

●2 status led / port

●

Sub D9 PROFIBUS RS485 connector

●9.6 Kbps to 12 Mbps

●

External 24V power supply

FDT / DTM Configuration

●

Field Device Tool

●Vendor tools integrated inside one tool

●Tools are Device Type Managers (DTM)

●

Benefit: Common Environment:

●

Benefit: Common Environment:

●User Management ●DTM Management ●Data Management ●Network Configuration ●Navigation HART

(Device Type Manager DTM)

Device Tool Managers

DTM in Unity Pro

●

DTM Browser

●Integrated DTM (implemented when module added from the PLC_Bus)

●Dedicated DTM (devices that can interact with Unity Pro application)

●Third Party DTM (Unity Pro used as any other FDT frame application)

Hardware Catalog

●

DTM Database

●Tools Menu – Hardware Catalog

●

Update Tool

●Used to add New devices inside the catalog

●Used to add New devices inside the catalog

●DTM must be installed in Windows before

DTM Transfer

●

With Project Transfer

●Integrated DTM

●

Direct Ethernet Communication

●Dedicated or Third Party DTM

Switch

PLC

DTM Transfer for Non Integrated DTM

PRM Master DTM

●

Master DTM

●Dedicated DTM to be used with Unity Pro

●Profibus topology description by instantiating Device DTMs in the FDT frame browser

●Profibus network scan capability

●PLC I/O Scanner lines automatically configured in Unity Pro to scan the

●PLC I/O Scanner lines automatically configured in Unity Pro to scan the PRM process image

●Ready-to-use structured variables automatically created in Unity Pro for the

Profibus devices

PRM Master DTM

●

Dedicated to Unity Pro

Ethernet UNITY Pro V5.0 Profibus PA PRM Input Profibus DP DP Class 1 PRM master DTM Generic DTM

PRM Generic Profibus Device DTM

●

Generic Profibus Device DTM

PRM CommDTM

●

CommDTM

●Supervision & partial configuration of the PRM

●Can be used in Unity and any FDT application and any FDT application

Master DTM and Comm DTM

●

Services Can Run in Parallel

UNITY Pro V5.0 PRM _{Com DTM}

Asset Management Profibus PA PRM Ethernet Input Profibus DP DP Class 1 PRM master DTM Management

High availability with HSBY architectures

compatibility

Exercise

●

PRM Master DTM (p6-17)

– Install the PRM DTM

– Add the PRM inside the Hardware Catalogue

– Add the PRM inside a Unity Pro project

Dynamic Assignment

●

IP Assignment Given By Servers

Switch Request for IP @Request for IP @

Switch Switch Server Your IP @ Your IP @ Client

BootP Server

●

Server Has a Populated List of Devices

●Devices identified with their MAC address

My MAC address is 00.80.F4.FF.00.D5, Can I get an IP Address?

Device #1 Master (Server)

00.80.F4.FF.00.D5 192.168.0.23

My name is 45.80.F4.FF.33.12, Can I get an IP Address?

00.80.F4.FF.44.21 192.168.0.81 00.80.F4.FF.F2.15 192.168.0.40

Sure! You are listed in my address table. Take this address: 192.168.0.23

Device #2

Sorry, you are not listed into my address table. Use your default IP address

BootP Server (Cont.)

●

Example in Unity Pro

●

Limitation: Device Cannot Be Changed without Reconfiguration

●As each device has a unique MAC address, replacing a failed device needs

DHCP Server

●

Same As BootP but Based on Role Name

●User configurable names used instead of MAC Addresses

My name is STBNIP2212_023, Can I get an IP Address?

Device #1 Master (Server)

STBNIP2212_023 192.168.0.23

My name is TesysT_072, Can I get an IP Address?

TesysT_046 192.168.0.87 ATV71_555 192.168.0.21

Sure! You are listed in my address table. Take this address: 192.168.0.23

Device #2

Sorry, you are not listed into my address table. Use your default IP address

DHCP How To Create Role Names

●

Depends on The Device

●Using embedded HMI (ex: ATV71)

●Using web based applications (ex: Advantys STB)

●Using dedicated applications (ex: Unity Pro)

●Using hardware switches (ex: Tesys T, Advantys STB)

●

Hardware Switches Example:

●Base name + Custom number derived from Switches

DHCP Server

●

Example with Unity Pro

●

Advantage: Easiness of Replacement

●Compared to the BootP method, replacing a faulty device with DHCP doesn’t need to reconfigure the PLC application.

FDR Server

●

Additional Feature of A DHCP Server.

●Send the stored configuration inside a replaced device

My name is TesysT_072, Save my settings now!

Device #1 Master (Server)

TesysT_072 192.168.0.87

Saved Config. of TesysT_072

Device #1 Device #1

Master (Server)

TesysT_072 192.168.0.87

Saved Config. of TesysT_072

New Device

My name is TesysT_072, Can I get an IP Address?

Sure! You are listed in my table. Take this address: 192.168.0.87

Moreover, I found a configuration corresponding to your role name. Here is your new configuration.

PRM General Settings

●

IP Used For DTM

Connection

●

DHCP Entry Automatically

Copied in the Network

Settings

●

Name Must Match with

Implicit Exchange: IO Scanning

●

Table of Words Exchanged Automatically Between Master & Slave

Master / Client

IO Scanning

IO Scanning (Cont.)

●

Debug View Online Mode (M340 and Premium Only)

IO Scanning Specific Integration Tool

●

Only with Compatible Devices

Transfer Organization

●

Transfer Unity Application to the M340

Exercises

●

PRM Configuration (p6-32)

– Set the MAC address

– Set the IP address: 192.168.0.X3

– Create the role name with the rotary switches

– Activate the DHCP

●

IO Scanning Configuration (p6-42)

– Add a network

– Configure the IP address of the M340: 192.168.0.X5

– Set the appropriate line in the IO Scanning

– Verify the address server

PRM Configuration Settings

●

Basic Settings

●Baudrate, stations range

●

Advanced Settings

●Advanced parameters

automatically calculated – to be changed only if needed

changed only if needed

●

IO Scanning

●Behavior in regards with the IO Scanning

PRM Basic Settings

●

Baudrate

●

PRM Master Address

●Used in case of multimaster

●

Highest Station Address

PRM Advanced Settings

●

TTR Management

●Token circulation (Multimaster)

●

Error Management

●

Other Timing Management

●Used if gateways, repeaters..

●

Calculated Timing

●

Device Watchdogs

●

Profibus Cycle

PRM IO Scanning Settings

●

IO Scanning Automatic Implementation

●

Scan Optimization

PRM Management

●

Dedicated Function Blocks Library

●

PRM_MGT

●Used to start the PRM master ●Depends on the PLC

Exercises

●

Modifying Some Settings (p6-54)

– Set the PRM watchdog to 5sec

– Set the Modbus Health timeout to 3sec

– Test the new settings

●

Enable the Profibus Master (p6-58)

– Install the Profibus Library

– Implement the PRM_MGT FB

– Insert the appropriate variables

– Operate the Master

Add Devices In The Database

●

Add Device with GSD

●Generic GSD DTM will be created from GSD.

●

Add Device from DTM

Add Devices In The Configuration

●

Device Menu – Add Device

●

Fieldbus Discovery

Device Profibus Parameters

●

Device Address

●

DPV1 Settings

●

Profibus Settings

●

Profibus Settings

Device Parameters

●

Device With DTM

Device Parameters

●

Device From GSD

Process Variables

●

Custom Names

Online Diagnostics

Online Diagnostics (Cont.)

●

Process Variables Diagnostic

Online Diagnostics (Cont.)

●

I/O Values

Online Diagnostics (Cont.)

Exercises

●

Add a Device from a GSD (p6-68)

– Add the GSD in the library

– Add the device in the DTM Browser

●

Configure a Device from GSD (p6-75)

– Change the address of the device to 5

– Change the address of the device to 5

– Configure the modules

– Configure the module’s parameter: fallback mode

– Update the IO Scanning

– Connect and test

DPV1 Explicit Exchange

●

Function Blocks

●PRM_ID

●Set the ID of which PRM to use

●RDREC

●Execute a read parameter request

●WRREC

DPV1 Explicit Exchange (Cont.)

●RDIAG

●Read diagnostic when the device requires it

Exercises

●

Diagnostic Management (p6-87)

– Create a diagnostic by tripping the Tesys U

– Read the diagnostic and reset the bit using RDIAG

●

Read Data Record (p6-89)

– Implement the RDREC to read the ID register

– Implement the RDREC to read the ID register

●

Write Data Record (p6-81)

– Implement the WRREC

Limitations Of The PRM

●PRM is

not compatible with EIP scanners

● Modbus protocol is compatible, but no link between PROFIBUS Master DTM and EIP configuration (EIP master DTM must evolve to accept a future PROFIBUS gateway DTM)

●

Limited redundant architectures

● No daisy chain loop,

● No dual master, no dual Ethernet attachment

●Miscellaneous

●

No online modification

● No import/export of the FDT/DTM configuration

● Empty Terminal Service depends of PLC memory capacity and number of DTMs ●Typical PROFIBUS DTM consumes 20 to 30 Kbyte

Profibus

●

Main Features Reminder:

●up to 100m at 12Mbit/s, 1200m w/o repeaters at 93,75kbit/s -●response time < 2ms at 12Mbit/s

●up to 126 devices, up to 32 per segment

●maximum 244 byte as user data per telegram ●shield used as reference point

●error detection: good (HD=4) ●low process data flexibility