Siemens SIMATIC PN/M-Bus LINK Operating Instructions Manual page 10

Safety information
2.1 Safety information
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.
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.
Working on the device or on connected components
Risk of electric shock
May cause death or serious injury
• Voltages > 60 V DC or 30 V AC may be present in the control cabinet. Therefore
• Before carrying out any work on the device or on connected components, make sure
• Use cable types with UL approval for UL-approved systems.
8
WARNING
WARNING
appropriate safety precautions must be taken to prevent contact during commissioning
and maintenance work.
that the installation is in a zero-voltage state.
Operating Instructions, 03/2018, A5E44260928-AA
PN/M-Bus LINK