Siemens SIMATIC CN 4100, Руководство по эксплуатации оборудования, Страница: 37 / 76

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.
D
E
Connecting
6.2 Notes on wiring
CN 4100 Communication System
Equipment Manual, 10/2021, A5E50871363-AA
37