Siemens LOGO! CMK2000 Operating Instructions Manual page 12

Safety notes
2.1 Safety instructions
Safety extra-low voltage
Note
Only connect the device via a safety extra-low voltage
The device is designed for operation using directly connectable safety extra-low voltage
(SELV) with safe electrical isolation according to IEC 60950-1 / EN 60950-1 / VDE 0805-1.
The following applies to use in North America: The power supply unit for supplying the
device with power must comply with NEC Class 2 in accordance with National Electrical
Code (ANSI / NFPA 70).
You must, therefore, only connect the supply terminals and the process and communication
signals (including Ethernet) to safety extra-low voltages (SELV) with safe electrical isolation
to IEC 60950-1 / EN 60950-1 / VDE 0805-1.
Note
Safety extra-low voltage
Contact with live components can result in a mild electric shock.
• Disconnect from the power supply before starting work.
• Ensure that no wires or strands protrude from the terminals that can be touched.
Working on the device or on connected components
Risk of electric shock
May cause death or serious injury
• Voltages > 60 V are present in the control cabinet. Therefore appropriate safety
• Before carrying out any work on the device or on connected components, make sure
• UL-approved cable types must be used for UL-certified systems (60/75°C).
12
WARNING
precautions must be taken to prevent contact during commissioning and maintenance
work.
that the installation is in a zero-voltage state.
Operating Instructions, 11/2015, A5E34877550B/001
CMK2000