technical basics

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
DP
FMS
PA
Application Profiles
DP-Functions
Fieldbus Message Specification (FMS)
not used
DIN E 19245 partl 4
PROFIBUS guidelines
EN 50 170
3
Wiring
2 wires
shield
4
Pin assignement
5
Termination, RS485
VP (6)
Station 1
Station 2
Data line B
RxD/TxD-P (3)
Data line A
RxD/TxD-N (8)
Shield
DGND (5)
6
Installation, DP-nodes
First station
Last station
Bus termination
Bus termination
VP
VP
Data line B
B
B
Data line A
A
A
DGND
DGND
B
A
B
A
B
A
B
A
Station 2
Station 3
7
Installation, PA-nodes
Bus termination
Bus termination
Power Supply
100?
100?
1 ?F
1 ?F

Max 32 PA-stations
8
The smallest data package
The OCTET
1. octet
2. octet
Idle
Start 1 2 3 4 5
6 7 8 Parity Stop Start
Bit sequense
9
Data representationIEC 6 1158-2
0
1
0
1
1
1
I09mA
I0
I0-9mA
t
bit 1
bit 3
bit 5
10
Stations, repeaters and segments
Termination
Termination
Repeater
Station 1
2
3
30
31
Termination
Repeater
33
32
62
61
11
Token ring
Logical token ring
Aktive stations, MASTERS
PC
PLC
PLC
PROFIBUS
Passive stations , SLAVES
12
Exchange of data, master/slave
Request
Slave ? Master
DP-Master
Data
Data
Master ? Slave
DP-Master
Status
13
The 3 most common PROFIBUS telegrams
SDx Start Delimiter x DA
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
1.) Token Passing
2.) FDL Status Request Telegram
3.) Data Telegram
SD2 LE LEr SD2 DA SA FC DSAP SSAP
DU FCS ED
Head
Tale
14
Data transmission at 1.5 MBaud
Tbit transmission time, 1 bit 0.6667?s
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

• 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 (33661437511)Tb
  it 0.219 ms

15
Cycle time, DP Mono-master-system
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
PLC
17
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 [phone]
Mailbox GSD, Siemens Typdateien
05231 141555 NameGast kein Password

Version 1.6 Stand
10.6.97 Km


Profibus_DP GSD_Revision
1 Vendor_Name "Weidmueller
Interface" Model_Name "WINbloc
8DI" Revision
"V1.6" Ident_Number 0x250
18
GSD-filecont.
Protocol_Ident 0 Station_Type
0 FMS_supp
0 Hardware_Release "Ver.4" Software_Release
"00" 9.6_supp
1 19.2_supp 1 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_at_TdF_at_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