Siemens SIMATIC NET PROFIBUS Instructions d'exploitation télécharger pdf (Page 51)

Installation and Maintenance

5.9 Cleaning

SIMATIC NET PROFIBUS Optical Link Module OLM V4.0

Operating Instructions, 01/2013, C79000-G8976-C270-03

5.9 Cleaning

If it becomes necessary to clean the device, this must be done with a dry, lint-free cloth. Do

not use water or solvent! If liquids get into the device, it must be deactivated.

When cleaning the device, make sure that no dirt enters the optical transmission path or gets

onto the optical components. This means either that the fiber-optic cables remain connected

or you fit the supplied protective caps!

5.10 Configuration

Because of frame delays due to cables, network components and monitoring mechanisms in

the network components, the PROFIBUS network parameter "slot time" must be adapted to

the network span, the network topology and the data rate when configuring the network.

5.10.1 Configuring optical bus and star topologies

You configure the PROFIBUS network, for example with SIMATIC STEP 7 (V5) or COM

PROFIBUS (V5). You enter the number of OLMs and overall cable length in a configuration

dialog. The configuration tools then check whether the slot time can be retained in the

chosen communication profile. If the limit is exceeded due to the extra delays caused by

OLMs and fiber-optic cables, a warning message is displayed and the parameters are

adapted.

5.10.2 Configuring redundant optical rings

The following configuration requirements must be met in the redundant optical ring (see

section 3.3 for details):

 One un

used address lower than the HSA (1)

 Increase of the retry value to at least 3 (2)

 Checking and adaptation of the slot time (3)

Use the user-specific profile of the configuration tool to set the parameters under (2) and (3).

Calculate the slot time based on the following equation:

Slot time = a + (b * Length

FOC

) + (c * Number

OLM

)

Slot time is the monitoring time in bit times

Length

FOC

is the sum of all fiber-optic cables (segment lengths) in the network.

The length must be entered in km!

Number

OLM

is the number of the PROFIBUS OLMs in the network.

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 63 64

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Siemens SIMATIC NET PROFIBUS Instructions d'exploitation Page 51

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