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General technical specifications
1.1 Installation and EMC guidelines
1.1.13.3
24 V power supply
To attenuate external interference, a line filter must be provided for the 24 V power supply of
the digital I/O (e.g. SIFI-B line filter, Order No. B84112-B-.... from Epcos/NF 1-1 line filter of
Phoenix Contact). This filter should be installed as close as possible to the terminal block.
The shield connection of the line filter must be bonded to ground across the shortest
possible distance.
In addition, a lightning protection/overvoltage protection element must be provided for the 24
V power supply.
For more information, refer to the "SIMATIC Automation Systems S7-400, M7-400,
Hardware and Installation".
Safe electrical isolation to IEC 61131-2 must be ensured for all power supply units operated
on SIMATIC TDC devices and modules.
1.1.13.4
Power supply potentials
In SIMATIC TDC, the ground connections of all secondary voltages are grouped and bonded
to the rack enclosure in order to improve the signal to interference ratio and to ensure proper
grounding.
30
WARNING
SIMATIC TDC hardware
System Manual, 12/2013, A5E01114865-07
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