Siemens SIMATIC Distributed I/O ET 200eco PN Operating Instructions Manual page 34

What is functional ground?
All ET 200eco PN I/O devices have a functional earth connection. This connection is used to
suppress interference but not for protective purposes. You establish a direction electrical
connection to a point in your plant or a shield using the functional earth connection. EMC
interference is discharged directly to earth through this connection. The interference
immunity of the entire I/O device is increased by the discharge of the EMC interference.
Install ET 200eco PN I/O devices on conductive base
Requirements
Conductive base for installation of the I/O device.
Procedure
The procedure and further information about the required tools and accessories are described
in the Section Installation without mounting rail (Page 21).
NOTE
Grounding with conductive base
When you fasten an I/O device of ET 200eco PN to a conductive, grounded base, the two
module fixing screws create a conductive connection to the ground potential.
Make sure there is a low-impedance connection between the peripheral device and the con­
ductive substrate and between the conductive substrate and the functional ground.
Install ET 200eco PN I/O devices on non-conductive base
Requirements
Non-conductive base for installation of the I/O device.
Tools required
You need the following tools to connect to the functional ground:
• Stripping tool
• Crimp tool
• Screwdriver
Required accessories
You need the following accessories to connect to the functional ground:
• M5 x 8 fixing screw and washers
• Grounding cable (copper braid cable) with a minimum cross-section of 4 mm
• Cable lug suitable for M5 screws
ET 200eco PN
Operating Instructions, 06/2022, A5E01250250-AN
Wiring
3.5 Wiring the ET 200eco PN
2
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