Siemens SIMATIC NET PROFIBUS - Manual (Page 261)

Lightning and Surge Voltage Protection for LAN Cables Between Buildings
B-7
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
B.2.3 General Information on the Lightning Protection Equipment
from the Firm of Dehn & Söhne
S When installing the modules read the instructions regarding the products from
Dehn & Söhne.
S
If there is a fault in a lightning protection module, communication on the bus is
interrupted (cable short-circuit). To re-establish communication temporarily
(without lightning protection) the protective modules can be removed from the
base modules since these function as through-connected terminals without the
protective module.
S The rest of the plant protection concept must be implemented complying with
VDE 0185 Part 103.