The terminal PS1 supplies the slots CPU1 and CM1. The terminal PS2 supplies the slots CPU2 and
CM2.
Note
Requirements for safety extra-low voltage (SELV)
The device may only be connected to a 24 V DC power supply that meets the requirements for
safety extra-low voltage (SELV), EN / IEC / UL 61010-2-201 and DIN EN 61131-2.
If the device is used on a wall, in an open rack or other similar locations, an NEC Class 2 power
source is required to meet the UL requirements (*).
*According to UL 60950-1 and National Electrical Code (r) (ANSI/NFPA 70).
In all other cases (according to IEC / EN / DIN EN 60950-1), either a limited power source (LPS =
Low Power Source) or a line-side fuse or circuit breaker is required.
Limit the current to a value below 4.16 A. Recommended fuse: Max. 0.8 A for each power supply.
Cable cross-sections
The cable cross-sections depend on their particular application.
The cables must have a cross-section of 0.75 mm² to 2.5 mm² and a temperature class of over
80 °C.
Note
Reverse polarity protection
The input power module of the SIMATIC CN 4100 system is protected against reverse polarity of
the input voltage.
TWIN end sleeves for the push-in terminal leads
Due to the space required by TWIN end sleeves with a cross-section of 0.75 mm
2
, you need to
ensure a correct angle to the conductor alignment when crimping the TWIN end sleeves so that
the conductors are optimally aligned.
Connecting
6.2 Notes on wiring
CN 4100 Communication System
Equipment Manual, 10/2021, A5E50871363-AA 37
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