Oslo University College technical basics The PROFIBUS protocols Wiring Installation, DP- and PA-nodes Data representation on the bus Exchange of data,

Oslo University College

technical basics

The PROFIBUS protocolsWiring Installation, DP- and PA-nodes Data representation on the busExchange of data, master / slaveCycle time, DP Mono-master-

systemConfigurationGSD : Electronic data sheet


The PROFIBUS protocols

User

Lay

er

(3)-(6)

Application(7)

Data Link(2)

Physical(1)

not used

DP PAFMS

Fieldbus MessageSpecification (FMS)

IEC 61158-2

PROFIBUS guidelines

IEC Interface*Fieldbus Data Link (FDL)

RS-485 / Fiberoptikk

EN 50 170 DIN E 19245 partl 4

DP-Functions

Application Profiles


Wiring

2 wires

shield


Pin assignement


Termination, RS485

Station 1 Station 2

Shield

RxD/TxD-P (3)

DGND (5)

VP (6)

RxD/TxD-N (8)

(3) RxD/TxD-P

(5) DGND

(6) VP

(8) RxD/TxD-N

390

Data line B

Data line A

DGND (5)

VP (6)

220

390

RxD/TxD-P (3)

RxD/TxD-N (8)


Installation, DP-nodes

VP

B

A

DGND

First station

390

220

390

Bus termination

Last station

Bus terminationVP

B

A

DGND

Data line B

Data line A

B BA A

Station 2 Station 3

390

220

390

BA BA


Installation, PA-nodes

Power Supply

100 100

1 F1 F

…… Max 32

PA-stations

Bus termination

Bus termination


The smallest data package

Idle

Start 1 2 3 4 5 6 7 8 Parity Stop StartBit sequense:

1. octet

LSB MSB

2. octet

LSB

The OCTET


Data representationIEC – 6 1158-2

tbit 1 bit 2 bit 4 bit 6bit 3 bit 5

1 0 1 01 1

I0

I0+9mA

I0-9mA


Stations, repeaters and segments

Termination

Termination

2 3 30 31

62 61 33 32

Termination

Repeater

Repeater

Station 1


Token ring

Aktive stations, MASTERS

Passive stations , SLAVES

PLCPLC PC

PROFIBUS

Logical token ring


Exchange of data, master/slave

Data

Status

DP

-Sla

ve

DP

-Mas

ter

Request

Data

DP

-Sla

ve

DP

-Mas

ter

Slave Master

Master Slave


The 3 most common PROFIBUS telegrams

1.) Token Passing

2.) FDL Status Request Telegram

3.) Data Telegram

SDx = Start Delimiter xDA = Destination Address

SA = Source Address

FC = Function Code

FCS = Frame Check Sequence

ED = End Delimiter

LE = Length

LEr = Repeated Length

DSAP = Destination Service Access Point

SSAP = Source Service Access Point

DU = Data Unit

SD4 DA SA

SD1 DA SA FC FCS ED

SD2 LE LEr SD2 DA SA FC DSAP SSAP DU FCS ED

TaleHead


Data transmission at 1.5 MBaud

” Idle time ” for master : typical 75 Tbit = 50 s ” Station delay time ” for slave : typical 11 Tbit = 7.3 s

Total, 2 bytes of data : (33+66+143+75+11)Tbit = 0.219 ms

Tbit = transmission time, 1 bit = 0.6667s

OCTET : 11 Tbit = 7.3 s

Token Passing : 33 Tbit = 22 s

Status / Request : 66 Tbit = 44 s

Data : Head (9 octets) + Tale (2 octets) + Data (n octets)

2 bytes of data : 13 x 11 Tbit = 143 Tbit = 95.3 s


Cycle time, DP Mono-master-system

Each Slave : 2 bytes in / 2 bytes out

Bus cycle time [ms]

Number of Slaves

12 MBit/s

1.5 MBit/s

500 kBit/s


ConfigurationPROFIBUS

Configuration Software

System Configuration

Electronic Data Sheet (GSD - files)

PLC

PROFIBUS

GSD GSD GSD GSD GSD GSD

PLC


GSD-file (WINblock station)

; WIWB0250.GSD ; Geraetestammdatei fuer PROFIBUS DP WINbloc 8 DI P ; Art.No. 827516 ; Weidmueller GmbH + Co, Postfach 2807, 33058Paderborn ; Serviceline 05252 960-555, Fax 05252 960116 ; Mailbox GSD, Siemens Typdateien: 05231 141555; Name:Gast kein Password ; ; Version: 1.6 Stand: 10.6.97 Km ;================================;#Profibus_DPGSD_Revision = 1Vendor_Name = "Weidmueller Interface"Model_Name = "WINbloc 8DI"Revision = "V1.6"Ident_Number = 0x250;


GSD-filecont.

Protocol_Ident = 0Station_Type = 0FMS_supp = 0Hardware_Release = "Ver.4"Software_Release = "00";9.6_supp = 119.2_supp = 1O.s.v12M_supp = 1;MaxTsdr_9.6 = 60MaxTsdr_19.2 = 60O.s.vMaxTsdr_12M = 800;Redundancy = 0Repeater_Ctrl_Sig = 224V_Pins = 0;Implementation_Type = "LSPM2"Bitmap_Device = "winblocn"Bitmap_Diag = "winblocs";


GSD-file cont.; Slavespezifische Werte;OrderNumber = "827516"Periphery = "WINbloc"Freeze_Mode_supp = 1Sync_Mode_supp = 1Auto_Baud_supp = 1Set_Slave_Add_supp = 0Min_Slave_Intervall = 1Modular_Station = 0Modul_Offset = 0Fail_Safe = 0Slave_Family = 3@TdF@WINbloc;Max_Diag_Data_Len = 13User_Prm_Data_Len = 0x05User_Prm_Data = 0x00,0x00,0x00,0x00,0x00Module = "DP-Kompaktgeraet 8 I" 0x00,0x10EndModule

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Oslo University College technical basics The PROFIBUS protocols Wiring Installation, DP- and PA-nodes Data representation on the bus Exchange of data,