Connecting Io-Link I/O Modules To Functional Ground - Siemens SIMATIC ET 200AL System Manual

Power supply of the configuration
Up to two voltage groups are available for the ET 200AL distributed I/O system.
• 1L+ via IO-Link (supply voltage / non-switched)
• 2L+ via port class B or M12-L power connector (load voltage / switched)
Note
Connecting and disconnecting of 1L+ IO-Link, 2L+ via port class B or M12-L power
connector
Unlike the load voltage 2L+ via port class B or the M12-L power connector, the connection
and disconnection of the supply voltage 1L+ during operation results in a module restart.
5.4

Connecting IO-Link I/O modules to functional ground

Introduction
You must connect the IO-Link I/O modules to functional ground.
What is functional ground?
All IO-Link I/O modules have a functional ground connection. This connection is used to
suppress interference sensitivity, but not for protection purposes. With the functional ground
connection, you establish an electrical connection to a point of your system or a shield.
Electromagnetic interferences are discharged directly to ground via this connection. By
discharging the electromagnetic interference, the interference immunity of the entire
module is increased.
The figure below shows the symbol that is used to mark the functional ground connection on
the IO-Link I/O modules.
Figure 5-4
IO-Link I/O modules
System Manual, 10/2020, A5E48755395-AA
Functional ground
5.4 Connecting IO-Link I/O modules to functional ground
Connecting
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