Dc Power Supply - Siemens SIMATIC PN/BACnet LINK Operating Instructions Manual

7.3 24 V DC power supply
24 V DC power supply
The connection of the external 24 V power supply and the functional earth connection takes
place via a 3-pin screw-type terminal. It is located below the top housing cover (see Design
(Page 17)).
A suitable power supply is, for example, SIMATIC S7-1200 Power Supply PM1207
(6EP1332-1SH71).
Safety information
Connection only over safety extra-low voltage / protective extra-low voltage
May cause death or serious injury
The device is designed for operation using directly connectable safety extra-low voltage
(SELV) with safe electrical separation according to IEC 60950-1 / EN 60950-1 / VDE 0805-
1 or IEC 61131-2 / EN 61131-2 / DIN EN 61131-2.
To maintain the safety property of the low voltage circuits of the PN/BACnet LINK, the 24 V
rated power supply as well as external connections to communication ports must be
supplied from reliable sources that meet the requirements for SELV / PELV limited voltage
sources according to different standards.
Therefore only connect safety extra-low voltages (SELV) with safe electrical separation
according to IEC 60950-1 / EN 60950-1 / VDE 0805-1 to the supply voltage connections
and the communications interfaces.
Connector pin assignment
The figure below shows the assignment of the terminal for the 24 DC power supply.
Table 7- 1
Permissible torques for screw terminal:
● Minimum tightening torque: 0.5 Nm
● Maximum tightening torque: 0.6 Nm
PN/BACnet LINK
Operating Instructions, 10/2017, A5E39895543-AA
WARNING
Terminal assignment for the 24 DC power supply
L+ 24 V supply for PN/BACnet LINK (+)
M 24 V supply for PN/BACnet LINK (-)
Functional ground
Connecting
7.3 24 V DC power supply
55