Connecting The Functional Ground - Siemens Simatic Operating Instructions Manual

External lightning protector
An external lightning protector can be installed in the 24 V DC supply line to protect against
powerful pulses on the supply lines:
We recommend the Dehn Blitzductor BXT ML2 BD 180, article number 920 247
(on basis BXT BAS) or an equivalent protection element.
Manufacturer:
DEHN+SOEHNE GmbH+Co.KG, Hans-Dehn-Str.1, Postfach 1640, D-92306 Neumarkt,
Germany The lightning protection module must be installed and used in accordance with the
manufacturer's specifications.
7.4

Connecting the functional ground

Connect the ground (e.g. from mounting rail) for discharge of EMI, such as bursts or surges,
to the FE terminal (see 24 V DC power supply (Page 68)).
Permissible conductor cross-section:
● 0.5 - 6 mm², AWG 26 - AWG 12
Note
EMC-compliant functional grounding
• Use as short a stranded-wire conductor as possible with a large cross section.
• Compliance with the technical specifications of the device is only assured with a correct
functional ground connection.
SIMATIC PN/CAN LINK
Operating Instructions, 03/2018, A5E39895388-AB
7.4 Connecting the functional ground
Connecting
69