Profibus Chapter 8

7/29/2019 Profibus Chapter 8

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New Features

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s


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PROFIBUS in Motion Control Applications

PROFIBUS used for

Read status and parameter information from the drives

Write parameters and download general commands (for

example Enable Application)

Handling of diagnostic messages

Real MC communication is handled via an

additional bus system


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Motion Control - Solution Today (continued)

P R O C E S S F I E L D B U S

SIEMENS

6SE7016-1EA30

WR2,2kW

Nr.467321

SIMOVERTSC

SIEMENS

6SE7016-1EA30

WR2,2kW

Nr. 467321

SIMOVERTSC

SIEMENS

6SE7016-1EA30

WR2,2kW

Nr.467321

SIMOVERTSC

SIEMENS

6SE7016-1EA30

WR2,2kW

Nr. 467321

SIMOVERTSC

MC Bus

DP Master

Additional

Hardware

2x Wiring

2x Configuration

What can beimproved?


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Requirements to use DP in MC Applications

Constant (equidistant) DP cycle time

including master class2

including DPV1 communication

including a reserve for telegram repetition

Clock synchronization between application and DP

cycle

jitter < 1 s

compensation of temporary clock failure

Data exchange between slave devices


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Constant Cycle Time & Synchronization

GC S1 S2 S3 Other Reserve GC S1 S2 S3 Reserve

PROFIBUS Cycle

Other

Application

Cycle

(3 Drives)


SIEMENS

6SE7016-1EA30

WR2,2kW

Nr.467321

SIMOVERTSC

SIEMENS

6SE7016-1EA30

WR2,2kW

Nr.467321

SIMOVERTSC

SIEMENS

6SE7016-1EA30

WR2,2kW

Nr.467321

SIMOVERTSC


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Monitoring cycle 0

Monitoring scores

Constant Cycle Time & Synchronization

(continued)

PLLPROFIBUSASIC

f = n / TDP

Jitter


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Data Exchange between Slaves

Controlling

Device

SIEMENS

6SE7016-1EA30

WR 2,2kW

Nr. 467321

SIMOVERTSC


Data Exchange

Telegrams

Publisher

Subscriber


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Requirements fulfilled with V3 of thePROFIDrive Profile

Up to 31 nodes (12 drives and additional I/O)

1x controlling master and max. 1x class 2 master

Transmission rate = 12Mbaud

Up to 100m/328ft - no FO or repeaters

Proper installation is CRITICAL


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Requirements fulfilled with V3 of thePROFIDrive Profile (continued)

Compatibility is ensured

No new communication method necessary

Additional FC in telegram header for Publisher

Information needs to be included into the GSD file

Configuration tool handles set-up of the constant bus

cycle and also the filter tables for Subscriber

MC supported by ASPC2 Step E2 & DPC31

Publisher/Subscriber also by SPC3 & LSPM2


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Performance Data

Basic amount 300s

Add 20s per Field Device

Add 1.5s per byte of I/O data

(Additional 500s for Class 2 device)

Example 1: 1x1 axis + 2x 2 axis + 3x I/O + 208 byte data

total

300s + 6x 20s + 208x 1.5s = 0.73ms (0.65 measured)

Example 2: 2x1 axis + 9x 2 axis + 3x I/O + 688 byte data

total

300s + 14x 20s + 688x 1.5s = 1.61ms (1.34 measured)


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Performance Data (continued)

0

1

2

3

4 8 16 32

Number of Field Devices

CycleTime[m

s]

8 Byte

16 Byte

32 Byte

Amount of Data

per Device


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Safety - Situation today

Proprietary

Safety Bus

2nd Layer2nd Layer

with Safetywith Safety

I/OI/O

DP Master


Standard I/O

(DP Slave)


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Safety - Situation today (continued)

M~

DS

F-Kit

M~

DS

F-Kit

M~

DS

F-Kit

M~

DS

F-Kit

Circuitcontactor

InputcontactorKO

Endmodule

Connection-modul

M~

ON

E-STOP

L+M

A1+A2-

PROFIBUS-DP

PM-DF1

DS

F-Kit

PLC

Master

IM151

Device for

Emergency Control

-E - STOP

U1

U2

ON

circuit

contacto

Device for

Emergency Control

PLC


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Safety - Situation today (continued)

Parallel wiring



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Safety - How it should be!

Monitoring

Device

PROFIBUS

Master

PROFIBUS-I/O PROFIBUS-I/O

PROFIBUS-I/O PROFIBUS-PA-Device

DP/PA

Repeater

PROFIBUS-I/O

PROFIBUS

Master



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Safety - Step 1


5

3

2 1

6

4


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Safety - How does it work?

Up to 244 Bytes

Standard

I/O Data

Failsafe I/O Data (up

to 122 Bytes)

Control/

Status Byte

Sequence #

(1 Byte)

CRC (2/4

Bytes)

Standard

I/O Data

Standard PROFIBUS Telegram for Data Exchange


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Safety - How does it work? (continued)

Standard-I /O

Standard

Control

1

2

7

1

2

7

1

2

7

1

2

7

1

2

7

= ASICs, Links, Cables, etc.(NOT safety relevant)

= PROFIsafe": Parts of the safety critical communications systems, e.g. Watchdog timers

= Safety relevant, but not part of the profile, e.g. Safety I/O

SafetyInput

SafetyControl

SafetyOutput

Safety-LayerSafety-LayerSafety-Layer

= Non safety critical functions, like e.g. diagnostic


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Safety - What is necessary?

Safety ControllerSafety Controller Special Hardware &

Firmware in Field Devices

Special Hardware &

Firmware in Field Devices


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Safety - Step 2: Data Exchange Broadcast

Publisher


5

2 1

4

3

Subscriber

Profibus Chapter 8

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Transcript of Profibus Chapter 8