basics The PROFIBUS protocols Wiring Data representation on the bus Cycle time, DP Mono-master-system GSD : Electronic data sheet

Transcription

1 technical basics The PROFIBUS protocols Wiring Installation, DP- and PA-nodes Data representation on the bus Exchange of data, master / slave Cycle time, DP Mono-master-system Configuration GSD : Electronic data sheet

2 The PROFIBUS protocols FMS DP PA La ayer User Application Profiles DP-Functions Application (7) Fieldbus Message Specification (FMS) (3)-(6) Data Link (2) Physical (1) not used Fieldbus Data Link (FDL) RS-485 / Fiberoptikk EN DIN E partl 4 IEC Interface* IEC PROFIBUS guidelines

3 Wiring 2 wires shield

4 Pin assignement Pin no Signal Description 3 RxD/TxD-P Data line B + (red wire) 5 DGND Signal Ground 6 VP Power for termination (P5V) 8 RxD/TxD-N Data line A - (green wire)

5 Termination, RS485 Station 1 Station 2 VP (6) RxD/TxD-P (3) (3) RxD/TxD-P Data line B 390 Ω RxD/TxD-P (3) DGND (5) VP (6) RxD/TxD-N (8) (5) DGND (6) VP (8) RxD/TxD-N Data line A 220 Ω RxD/TxD-N (8) Shield 390 Ω DGND (5)

6 Installation, DP-nodes First station VP Bus termination Bus termination Last station VP B 390 Ω Data line B 390 Ω B A 220 Ω 390 Ω Data line A 220 Ω 390 Ω A DGND DGND A B A B A B A B Station 2 Station 3

7 Installation, PA-nodes Bus termination Bus termination Power Supply 100Ω 1 μf 100Ω 1 μf Max 32 PA-stations

8 The smallest data package The OCTET Idle 1. octet 2. octet LSB MSB LSB Bit sequense: Start Parity Stop Start

9 Data representation ti IEC I 0 +9mA I 0 I 0-9mA bit 1 bit 2 bit 4 bit 6 bit 3 bit 5 t

10 Stations, repeaters and segments Termination Station 1 Termination Repeater Repeater Termination

11 Token ring Logical token ring Aktive stations, MASTERS PLC PC PLC PROFIBUS Passive stations, SLAVES

12 Exchange of data, master/slave Slave Master ster DP-Ma DP-S Slave Master Slave DP-Master DP-Slav ve

13 The 3 most common PROFIBUS telegrams 1.) Token Passing SD4 DA SA SDx = Start Delimiter x DA = Destination Address SA = Source Address 2.) FDL Status Request Telegram SD1 DA SA FC FCS ED 3.) Data Telegram 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 SD2 LE LEr SD2 DA SA FC DSAP SSAP DU FCS ED Head Tl Tale

14 Data transmission at 1.5 MBaud Tbit = transmission i time, 1 bit = μs OCTET : 11 Tbit = 7.3 μs Token Passing : 33 Tbit = 22 μs Status / Request : 66 Tbit = 44 μs Data : Head (9 octets) + Tale (2 octets) + Data (n octets) 2 bytes of data : 13 x 11 Tbit = 143 Tbit = 95.3 μs Idle time for master : typical 75 Tbit = 50 μs Station delay time for slave : typical 11 Tbit = 7.3 μs Total, 2 bytes of data : ( )Tbit = ms

15 Cycle time, DP Mono-master-system t Bus cycle time [ms] Each Slave : 2 bytes in / 2 bytes out 500 kbit/s 1.5 MBit/s 12 MBit/s Number of Slaves

16 Configuration PROFIBUS Configuration Software Electronic Data Sheet (GSD - files) PLC GSD GSD GSD GSD GSD GSD PROFIBUS

17 GSD-file (WINblock station) ;WIWB0250 WIWB0250.GSD ; Geraetestammdatei fuer PROFIBUS DP WINbloc 8 DI P ; Art.No ; Weidmueller GmbH + Co, Postfach 2807, 33058Paderborn ; Serviceline , Fax ; Mailbox GSD, Siemens Typdateien: ; Name:Gast kein Password ; ; Version: 1.6 Stand: Km ;================================ ; #Profibus_DP GSD_Revision = 1 Vendor_Name = "Weidmueller Interface" Model_Name = "WINbloc 8DI" Revision ="V1.6" Ident_Number = 0x250 ;

18 GSD-file cont. ; Protocol_Ident = 0 Station_Type = 0 FMS_supp = 0 Hardware_Release = "Ver.4" Software_Release = "00" 9.6_supp = _supp = 1 Osv O.s.v 12M_supp = 1 ; MaxTsdr_9.6 = 60 MaxTsdr_19.2 = 60 O.s.v MaxTsdr_12M = 800 ; Redundancy = 0 Repeater_Ctrl_Sig = 2 24V_Pins = 0 ; Implementation_Type = "LSPM2" Bitmap_Device = "winblocn" Bitmap_Diag ="winblocs" ;

19 GSD-file cont. ; Slavespezifische Werte ; OrderNumber = "827516" Periphery = "WINbloc" Freeze_Mode_supp _ = 1 Sync_Mode_supp = 1 Auto_Baud_supp = 1 Set_Slave_Add_supp = 0 Min_Slave_Intervall = 1 Modular_Station = 0 Modul_Offset = 0 Fail_Safe = 0 Slave_Family = 3@TdF@WINbloc ; Max_Diag_Data_Len = 13 User_Prm_Data_Len = 0x05 User_Prm_Data = 0x00,0x00,0x00,0x00,0x00 Module = "DP-Kompaktgeraet 8 I" 0x00,0x10 EndModule