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Introduction To ProfiBus DP

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Acromag, Inc. Tel:248-624-1541 Fax:248-624-9234 Email:sale[email protected] http://www.acromag.com

INTRODUCTION TO PROFIBUS DP

ABOUT PROFIBUS.…………………………………………… 3

PROFIBUS DP SLAVE STATE MACHINE..………………… 7

Power ON/Reset State………………………………….. 7

Parameterization State…………………………………. 7

I/O Configuration State…………………………………. 7

Data Exchange State……………………………………. 8

Fail Safe Operation…………………..………………….. 8

Watchdog……………………………..………………….. 9

GSD FILES……………………………………………………… 10

REQUIRED SOFTWARE…..………………..………………… 13

TYPES OF TRANSMISSION………………..………………… 14

SRD Send and Request Data w/Acknowledge…….. 14

SDN Send Data w/No Acknowledge………………….. 14

PROFIBUS DP DATA CHARACTER FORMAT……………. 14

ProfiBus Data Error Checking………….…………….. 15

PROFIBUS TELEGRAM STRUCTURE…………………….. 15

Start Delimiter……………………………………………. 16

Length Of Telegram…………………………………….. 18

Destination Address & Source Address…………….. 18

Function Code Or Frame Control…………………….. 18

Service Access Points………………………………….. 19

Data Unit………………………………………………….. 19

Frame Check Sequence………………………………… 19

End Delimiter…………………………………………….. 20

DP COMMAND FUNCTIONS…………………………………. 20

Function Status………………………………………….. 20

OPERATING STATES AND APPLICABLE FUNCTIONS.... 21

Initial Power ON/Reset………………………………….. 21

Set_Slave_Add Telegram………………………… 22

Parameterization……..………………………………….. 23

Set_Prm Telegram…………………………………. 24

I/O Configuration……..………………………………….. 26

Chk_Cfg Telegram…………………………………. 26

Get_Cfg Telegram…………………………………. 27

Diag_Data Telegram………………………………. 27

Data Exchange State..………………………………….. 33

Data_Exchange Telegram……..…………………. 33

Read_Inp Telegram……..…………………………. 33

Read_Outp Telegram…………..…………………. 34

Global_Control Services..……..…………………. 34

Use Of Freeze..……..……..…………………. 35

Use Of Sync/Unsync.……..…………………. 35

BUS TIMING………………….…………………………………. 36

This information is provided as a service to our customers and to others

interested in learning more about Profibus. Acromag assumes no

responsibility for any errors that may occur in this document, and makes no

commitment to update or keep this information current.

Be sure to visit Acromag on the web at

www.acromag.com.

Windows® is a registered trademark of Microsoft Corporation.

Modbus® is a registered trademark of Modicon, Incorporated.

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