Siemens SIMATIC NET PROFIBUS User Manual download pdf (Page 16)

16

PROFIBUS

Network components

Diagnostic repeater

The diagnostic repeater determines,

initiated by STEP 7 or COM PROFIBUS,

the topology of the bus system and

stores it in the internal diagnostics

memory.

If there is a fault, the repeater automat-

ically transfers a standard diagnostic

message to the bus master, containing

details of:

· The affected segment

· The fault location

(e.g. between nodes X and Y)

· The distance of the fault location in

meters from nodes X and Y as well as

from the repeater

· The type of fault

The following faults are diagnosed:

· Break in data cables A, B

· Short circuit data cable to shield

· Missing bus terminating resistor

Intermittent faults are also detected.

The diagnostic messages are

displayed graphically in STEP 7 and

COM PROFIBUS. They are fully

integrated into SIMATIC

®

system diag-

nostics (e.g. overview diagnostics,

"Report system fault" function).

Power rail booster

The power rail booster enables a

PROFIBUS-DP connection via contact

conductors, such as those used for

monorail conveyors or storage and

retrieval systems for high-bay ware-

houses, for example. The diverse

PROFIBUS-DP system capabilities,

such as diagnostics and PROFIsafe

safety technology via bus,

can continue to be used here.

Monorail conveyors

Vehicle control systems for monorail

conveyors can be implemented

economically on the basis of SIMATIC

standard components.

High availability, short reaction times

and easy upgradeability are achieved

by using distributed control, e.g.

SIMATIC ET 200S

®

with IM151/CPU.

With SIMATIC STEP 7, the user can also

program them over a contact conduc-

tor.

Storage and retrieval systems

for high-bay warehouses

With storage and retrieval systems for

high-bay warehouses, maintenance-

intensive data photo-electric barriers

can be replaced, thus increasing plant

availability.

Applications with slip rings

The power rail booster enables

PROFIBUS-DP routing via rotating axes

even with large diameters.

Figure 30: Diagnostics repeater

Figure 31: Graphic representation of the

fault location in STEP 7

Figure 32: Power rail booster

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