Siemens SIMATIC CN 4100 - Grounding; Grounding Connection

Grounding via reference potential
The reference potential of the SIMATIC CN 4100 communication system can be connected to
ground. A grounding screw is used for this.
Notes on the reference potential (Page 27)
Application (providing 󹪞oating reference potential):
• Removing the grounding screw (Page 30)
Grounding via cable
• Grounding the rack with a cable (Page 32)
• Grounding the module with a cable (Page 34)
5.4.4 Grounding
5.4.4.1 Grounding connection
De󹪝nition
The ground connection is used to discharge the current to ground via a connection with good
electrical conductivity. This is intended to minimize di󹪜erent electrical potential.
Description
• Low-resistance ground connections reduce the risk of electric shock in the event of a short-
circuit or defect in the system.
• Low-resistance connections (large surface area, large contact area) reduce the e󹪜ect of
interference on the communication system or the radiation of interference signals. E󹪜ective
shielding of cables and devices also makes a signi󹪝cant contribution to this.
CAUTION
Protective grounding
All Class 1 protective devices and all major metal parts must have protective grounding. This is
the only way to protect operators from electric shock. It also dissipates interference transmitted
through external power supply cables, signal cables, or cables to I/O devices.
Installation
5.4 Basics for mounting
CN 4100 Communication System
26 Equipment Manual, 10/2021, A5E50871363-AA