Olm Topology; Wlan Topology - Siemens SIMATIC ET 200AL System Manual

Description
2.2 Structure of PROFIBUS networks
2.2.4.3

OLM topology

Combination of electrical and optical networks with OLM
Additional distances can be covered by means of the Optical Link Module.
Because bus cables across several buildings are particularly vulnerable to damage caused
by overvoltage (effect of lightning), the devices in the connected bus segment must be
protected against overvoltage.
Figure 2-14 Combination of electrical and optical networks
2.2.4.4

WLAN topology

IWLAN/PB Link PN IO as gateway between Industrial Wireless LAN and PROFIBUS
The IWLAN/PB Link PN IO supports the use of IWLAN and WLAN antennas for wireless
data transmission. This means the numerous PROFIBUS system services, for example,
diagnostic by bus, can be used throughout.
Figure 2-15
40
PROFIBUS and WLAN
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC