Connecting
6
6.1
Notes on operation
Using the SIMATIC CN 4100 communication system in a plant requires that special rules and
regulations be observed, depending on the area of application.
This section provides an overview of the most important rules that you need to observe when
using the SIMATIC CN 4100 communication system.
Specific application
Observe the safety and accident prevention regulations that apply to specific applications, for
example, the machinery directives.
EMERGENCY STOP devices
EMERGENCY STOP devices according to EN / IEC 60204 must remain in effect in all operating
modes of the plant or system.
Avoiding dangerous system conditions
You must take suitable measures to ensure that dangerous operating states are also avoided in
the following situations:
• The plant restarts after a voltage dip or power failure.
• Bus communication starts automatically after a fault.
If necessary, force an EMERGENCY OFF!
After unlocking the EMERGENCY STOP device, there must be no uncontrolled or undefined
startup.
Supply voltage
Observe the following for the supply voltage:
• Typical functional extra-low voltage U
N
= 24 VDC +20/-10 % ( )
Ensure safe (electrical) isolation of the extra-low voltage (SELV/PELV).
The following standard must be observed: EN / IEC / UL61010-2-201
• For buildings: If there is a risk of overvoltage, you need to provide lightning protection
measures for external lightning protection (e.g. lightning protection elements).
CN 4100 Communication System
Equipment Manual, 10/2021, A5E50871363-AA
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