Siemens SIMATIC NET PROFIBUS manual LAN Cables between Buildings, Coarse Protection

Lightning and Surge Voltage Protection for LAN Cables Between Buildings

LAN Cables between Buildings

Since LAN cables between buildings are subject to higher overvoltage risks (the effects of lightning), the nodes included in the attached bus segment must be protected from the effects of overvoltage.

Lightning protection facilities for LAN cables are implemented in two different components, coarse protection and fine protection.

Coarse Protection

While coarse protection prevents the progress of high-energy lightning currents at the point of entry to the building, the fine protection installed in the vicinity of the DTE provides finer limitation of overvoltage for the bus node.

SThe lightning protection devices described below represent a protection concept developed in conjunction with the company of Dehn & Söhne for SIMATIC NET PROFIBUS and that can be used for all transmission rates (9.6 Kbps to 12 Mbps). The devices can be ordered directly from the firm of Dehn & Söhne; ordering data are listed below.

SWhen configuring a network make sure that the coarse and fine protection together must be considered as a node (reduction of the number of nodes in segments with lightning protection modules).

SIf a PROFIBUS segment runs through several buildings (several lightning components used in series), a repeater should be installed in each building to refresh the signal.

PROFIBUS Networks SIMATIC NET	B-3
6GK1970-5CA20-0AA1 Release 2 05/2000