PROFIBUS PA Date 09/19/00, Page 1 PROFIBUS PA s  PROFIBUS PA = PROFIBUS for Process Automation PA is based on the DP and DP Extended protocol DP Master Class 1 controls both DP AND PA field devices Definitions for DP protocol also valid for PA:  Parameterization  Configuration  Cyclic data exchange  Diagnostic ...

PROFIBUS PA Date 09/19/00, Page 2 PROFIBUS PA s  Physical Setup Physical layer based on IEC Synchronous data transfer with Manchester coding Power AND data are transferred via the same wire Different components for the physical setup (cable, connectors, termination…) Rules regarding topology and length according to IEC Transmission rate is 31.25kbaud

PROFIBUS PA Date 09/19/00, Page 3 PROFIBUS PA s  Physical Setup (continued) - Comparison Physics RS485 wire carries data only IEC wire carries data and power Transmission Rate 9,6K; 19,2K; 45,45K; 93,75K; 187,5K; 1,5M; 3M; 6M; 12M 31,25K NRZ (No Return to Zero)CodingManchester 11 bits per data byte 1 start bit, 8 data bits (LSB first) 1 parity bit (even parity), 1 stop bit Character Format 8 bits per data byte 8 data bits (MSB first) 1 parity bit for each character 1 byte FCS check sum (Frame Check Sequence) Check Sequence 16 bit CRC (Cyclic Redundancy Check)

PROFIBUS PA Date 09/19/00, Page 4 PROFIBUS PA s  Message Structure P:16 Bit Preample SD:Start Delimiter LE: Net Data Length (DU) + DA, SA, FC, DSAP, SSAP LEr:Length repeated DA:Destination Address (Where the message goes to) SA:Source Address (Where the message comes from) FC:Function Code ( FC=Type & Priority of Message) DU:Data Unit (Up to 246 Bytes including 2 Bytes for SAP’s) FCS:Frame Checking Sequence CRC:16 Bit Cyclic Redundancy Check ED:End Delimiter EOF:End Of Frame SDLELErSDDASAFCDU..FCSED SDLELErSDDASAFCDU..CRCEOFPSOF

PROFIBUS PA Date 09/19/00, Page 5 PROFIBUS PA s  Character Format Clock Binary NRZ (PROFIBUS) „1“ „0“ Manchester Bitphase L (PROFIBUS-PA) „1“ „0“

PROFIBUS PA Date 09/19/00, Page 6 PROFIBUS PA s PROFIBUS up to 12Mbaud 24 V PA Link PA Coupler PA Coupler  Network Addressing PROFIBUS 45.45kbaud PROFIBUS PA 31.25kbaud 24 V PA Coupler PA Coupler XX XX 3

PROFIBUS PA Date 09/19/00, Page 7 PROFIBUS PA s  Network Topology PROFIBUS T Branch (Main) Line Star PROFIBUS PA 24 V Termination Spur Line

PROFIBUS PA Date 09/19/00, Page 8 PROFIBUS PA s  Network Topology (continued) + -

PROFIBUS PA Date 09/19/00, Page 9 PROFIBUS PA s  Network Setup - Rules (continued) 24 V PA Coupler Up to 31 PA field devices can be connected to ONE coupler

PROFIBUS PA Date 09/19/00, Page 10 PROFIBUS PA s  Network Setup - Rules = PA Link= PA Coupler Up to 5 couplers can be used with one link

PROFIBUS PA Date 09/19/00, Page 11 PROFIBUS PA s  Network Setup - Rules (continued) 24 V PA Link PA Coupler Up to 31 PA field devices can be connected to ONE link - INDEPENDENT of the number of couplers

PROFIBUS PA Date 09/19/00, Page 12 PROFIBUS PA s  Network Setup - Rules (continued) PA Link PA Coupler Maximum current flow per coupler: 400mA for 110mA for EEx [ib] II C ignition protection 90mA for EEx [ia] II C ignition protection 24 V I

PROFIBUS PA Date 09/19/00, Page 13 PROFIBUS PA s  Network Setup - Rules (continued) 24 V Maximum segment length per coupler = 1,900m

PROFIBUS PA Date 09/19/00, Page 14 PROFIBUS PA s  Network Setup - Rules (continued) (Allowed Length PER Drop/Spur Line)

PROFIBUS PA Date 09/19/00, Page 15 PROFIBUS PA s  PA Profile Definition on the application layer level Profile defines variables, function blocks, meaning of the data, mapping to communication services... Devices with the same profile implemented can be exchanged Current version of PA Profile is V3.0 Available as official PROFIBUS International document with order no Pre-defined GSD files for various PA field devices available

PROFIBUS PA Date 09/19/00, Page 16 PROFIBUS PA s  PA Profile (continued) Measuring range DP services cyclic and acyclic DP Services acyclic DP services acyclic Profile B Status Measured value Manufacturer-specific parameters Filter time Alarm/warning limits Alarm summary TAG (e.g. for pressure transmitters)

PROFIBUS PA Date 09/19/00, Page 17 PROFIBUS PA s  Electronic Data Sheets GSD GSD File for description of communication parameters DD PA Field Device Device Description File for specification of functionality PROFIBUS Configuration Tool PROFIBUS Engineering Tool

PROFIBUS PA Date 09/19/00, Page 18 PROFIBUS PA s  Engineering Tool PROFIBUS-PA (31.25 kbaud) PROFIBUS (up to 12 Mbaud) Engineering Tool (Diagnostic Master) Direct access to field device via DP Extensions (e.g. to change range of measurement)