Example Of A Lightning-Protected Structure (Key To Figure Above) - Siemens SIMATIC S7-300 Hardware And Installation Manual

Components in previous figure 1-2
The table below explains consecutive numbers in the figure above:
Table 12-11 Example of a lightning-protected structure (key to figure above)
Consec.
no.
from
figure
above
1 lightning arrestor, depending on the mains
system, e.g. TN-S system:
1 piece DEHNbloc/3
, Order No.: 900 110* and
1 piece DEHNbloc/1
, Order No.: 900 111*
2 surge arrestors,
2 pieces DEHNguard 275;
Order No.: 900 600*
3 Surge arrestor,
Blitzductor CT type MD/HF
; Order No.: 919 506* and 919 570*
4 Digital input modules:
FDK 2 D 60 V; Order No.: 919 993*
Digital output modules: FDK 2 D 5, 24 V;
Order No.: 919 991*
Analog modules:
MD 12 V Blitzductor CT;
Order No.: 919 506 and 919 541
5 Bus cable shielding mounting device with
EMC spring clamp on the basic unit of
Blitzductor CT; Order No.: 919 508*
6 Cable for equipotential bonding: 16 sq.
mm
7 Blitzductor CT, Type B for building
transitions;
Order No.: 919 506* and 919 510*
* You can order these components directly from:
DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str.
S7-300 Programmable Controller Hardware and Installation
A5E00105492-02
Components
Appendix
Description
High-voltage protection against
direct lightning strike and surge
voltage as of transition 0 <-> 1
High-voltage surge protection at
transition 1 <-> 2
Low-voltage surge protection for
RS485 interfaces at transition
1 <> 2
Low-voltage surge protection,
signal modules I/O at transition
1 <-> 2
Discharge of interference current
Standardization of reference
potentials
High-voltage surge protection for
RS485 interfaces at transition 0 <-
> 1
12-27