Connecting Devices With 24 V Dc 2-Pin - Siemens SIMATIC HMI series Operating Instructions Manual

3.4.3.1

Connecting devices with 24 V DC 2-pin

Note before connecting the device
NOTICE
Safe electrical isolation
The device may only be connected to a 24 V DC power supply that meets the requirements
of a safe extra-low voltage (SELV) according to IEC/EN/DIN EN/UL 60950-1 or the
requirements of a secure extra-low voltage (SELV/PELV) according to IEC 61131-2.
The following applies to Industrial Flat Panels with article numbers "6AV7863-.....-0...": The
ground/minus pole of the 24 V DC power supply is connected to the PE over the device.
"..." stands for version key of the article number.
For Ethernet monitors: The supplying source must be fused for a power rating < 240 VA;
recommended fuse rating ≤ 8 A.
NOTICE
Damage to device due to inadequate cable cross-section
Using power supply cables with cross-sections that are too small can damage the device in
the event of a short circuit. The power supply connector is designed for cables with a
maximum cross-section of 2.5 mm².
NOTICE
External protective circuit
An external protective circuit is required for operation with 24 V DC, see section 7
"Lightning protection and overvoltage protection" in function manual
"Designing interference-free controllers
(https://support.industry.siemens.com/cs/ww/en/view/59193566)".
The following lightning protection element was used during the testing of the Industrial Flat
Panel: Dehn BVT AVD 24" (Order No. 918 422)
Note
The 24 V DC power supply must be adapted to the input data of the device, see section
"Technical specifications (Page 107)".
IFP, IFP PRO, IFP ETH
Operating Instructions, 11/2017, A5E31298376-AH
Installing and connecting the device
3.4 Connecting the device
59