Siemens CPU 312C Hardware And Installation Guide

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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The table below explains consecutive numbers in the figure above:
Table 12-11 Example of a lightning-protected structure (key to figure above)
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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*
High-voltage protection against
direct lightning strike and surge
voltage as of transition 0 <-> 1
2 surge arresters,
2 pieces DEHNguard 275;
Order No.: 900 600*
High-voltage surge protection at
transition 1 <-> 2
3 Surge arrester,
Blitzductor CT type MD/HF;
Order No.: 919 506* and 919 570*
Low-voltage surge protection for
RS485 interfaces at transition
1 <> 2
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
Low-voltage surge protection,
signal modules I/O at transition
1 <-> 2
5 Bus cable shielding mounting device with
EMC spring clamp on the basic unit of
Blitzductor CT; Order No.: 919 508*
Discharge of interference current
6 Cable for equipotential bonding: 16 sq.
mm
Standardization of reference
potentials
7 Blitzductor CT, Type B for building
transitions;
Order No.: 919 506* and 919 510*
High-voltage surge protection for
RS485 interfaces at transition 0 <-
> 1
* You can order these components directly from:
DEHN + SÖHNE
GmbH + Co. KG
Elektrotechnische Fabrik
Hans-Dehn-Str. 1
D-92318 Neumarkt

Siemens CPU 312C Specifications

General

Brand	Siemens
Model	CPU 312C
Category	Processor
Language	English