23.03.2017 Views

wilamowski-b-m-irwin-j-d-industrial-communication-systems-2011

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

32-2 Industrial Communication Systems<br />

TABLE 32.1<br />

Properties of the Communication Family CPF 3 for Profibus<br />

Layer Profile CP3/1 Profile CP3/1 Profile CP3/2<br />

Application Manufacturing automation Motion control Process automation (Profibus PA)<br />

Data link<br />

IEC 61158 subset DP-V0<br />

asynchronous transmission<br />

IEC 61158 subset DP-V2<br />

asynchronous transmission<br />

Physical RS485 RS485 MBP<br />

Plastic fiber<br />

Glass fiber<br />

PCF fiber<br />

Plastic fiber<br />

Glass fiber<br />

PCF fiber<br />

IEC 61158 subset DP-V1<br />

synchronous transmission<br />

Support for the Profibus technology is provided by more than 30 competence centers (PICC) and certification<br />

trainings are offered by training centers (PITC). The conformance of products to the standard and the<br />

interoperability of the different products is verified and tested by the test laboratories (PITL) available in all<br />

major markets.<br />

32.2 Physical Transmissions<br />

Profibus provides different versions of layer 1 as transmission technology listed in Table 32.2.<br />

32.2.1 asynchronous (RS-485)<br />

RS485 transmission technology is simple and cost-effective and primarily used for tasks that require<br />

high transmission rates. Shielded, twisted pair copper cable with one conductor pair is used. Details<br />

to RS 485 installation are described in [P2112,P8022,P8032]. The bus structure allows addition or<br />

TABLE 32.2<br />

Transmission Technologies (Physical Layer) at Profibus<br />

Data transmission<br />

MBP RS485 RS485-IS Fiber Optic<br />

Digital, bitsynchronous,<br />

Manchester encoding<br />

Digital, differential<br />

signals according to<br />

RS485, NRZ<br />

Digital, differential<br />

signals according<br />

to RS485, NRZ<br />

Optical, digital, NRZ<br />

Transmission rate 31.25.kb/s 9.6–12,000.kb/s 9.6–1,500.kb/s 9.6–12,000.kb/s<br />

Data security<br />

Cable<br />

Remote feeding<br />

Protection type<br />

Topology<br />

Number<br />

of stations<br />

Number<br />

of repeaters<br />

Preamble, errorprotected,<br />

start/end<br />

delimiter<br />

Shielded, twisted pair<br />

copper<br />

Optional available over<br />

signal wire<br />

Intrinsic safety<br />

(EEx ia/ib)<br />

Line and tree topology<br />

with termination;<br />

also in combination<br />

Up to 32 stations per<br />

segment; total of max.<br />

126 per network<br />

Max. 4 repeater<br />

HD = 4, Parity bit,<br />

start/end delimiter<br />

Shielded, twisted pair<br />

copper, cable type A<br />

Available over<br />

additional wire<br />

None<br />

Line topology<br />

with termination<br />

Up to 32 stations per<br />

segment without<br />

repeater; up to 126<br />

stations with repeater<br />

Max. 9 repeater with<br />

signal refreshing<br />

HD = 4, Parity bit,<br />

start/end delimiter<br />

Shielded, twisted<br />

4-wire, cable type A<br />

Available over<br />

additional wire<br />

Intrinsic safety<br />

(EEx ib)<br />

Line topology<br />

with termination<br />

Up to 32 stations<br />

per segment; up to<br />

126 stations with<br />

repeater<br />

Max. 9 repeater with<br />

signal refreshing<br />

HD = 4, Parity bit,<br />

start/end delimiter<br />

Multimode glass fiber,<br />

singlemode glass<br />

fiber, PCF, plastic<br />

Available over hybrid<br />

line<br />

None<br />

Star and ring<br />

topology typical;<br />

line topology<br />

possible<br />

Up to 126 stations<br />

per network<br />

Unlimited with signal<br />

refreshing (time<br />

delay of signal)<br />

© <strong>2011</strong> by Taylor and Francis Group, LLC

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!