Connecting
7.3 Connecting 24 V DC
PN/M-Bus LINK
Operating Instructions, 03/2018, A5E44260928-AA
31
Connecting 24 V DC
24 V DC power supply
The connection of the external 24 V power supply and of the
functional earth is made over a 3-pin screw terminal
①. This is
located under the upper flap on the enclosure.
A suitable power supply is, for example, SIMATIC S7-1200
Power Supply PM1207 (6EP1332-1SH71).
① Connection for 24 V power supply
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.
In order to maintain the safe characteristics of the low voltage circuits of the PN/M-Bus
LINK, the 24 V rated voltage supply and external connections to communication ports must
be supplied from approved sources which meet the requirements of various standards for
SELV / PELV voltage-limited sources.
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.
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