Siemens IEEE802.11 Especificações descarregar pdf (Página 4)

6/4

Siemens IK PI · 2015

■

Overview (continued)

Industrial Wireless Communication

Industrial Wireless LAN (IWLAN)

Introduction

Redundant network concepts can also be implemented by

wireless. Wireless channels are designed redundantly for this

purpose, with a failover time of a few milliseconds, so that the

application is not influenced by packet repetitions or inter-

ference in the radio channel.

In standard WLAN, access by all nodes to the wireless channel

is uncoordinated. This means that access by nodes with critical

data cannot be predicted.

The iPCF function (supported by device types with iFeatures)

permits cyclic data traffic in real time for several PROFINET IO

devices connected by wireless. In addition, this allows mobile

nodes to be transferred quickly from one wireless field to another

(roaming) so that PROFINET IO communication is not inter-

rupted.

No data rate reservation

This means that access by

nodes with critical data cannot

be predicted.

All nodes access the radio channel

without prioritization.

Client 6

Client 5

Client 4

Client 3

Client 2

Client 1

Time

G_IK10_XX_30178

IEEE 802.11

Cyclic polling of all nodes within radio coverage

This means that access by all

nodes can be predicted.

All nodes may predictably access the

radio channel

Client 6

Client 5

Client 4

Client 3

Client 2

Client 1

Time

G_IK10_XX_30177

IEEE 802.11

Kap_06_IWC_en.book Seite 4 Dienstag, 7. Oktober 2014 1:47 13

1 2 3 4 5 6 7 8 9 ... 183 184

Comentários a estes Manuais

Sem comentários

Siemens IEEE802.11 Especificações Página 4

Comentários a estes Manuais

Manuais e produtos relacionados com Redes Siemens IEEE802.11