Connection to live devices

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HMIs, human machine interfacesThin Client ET/MT-5x6Connection ofExternal USB devicesConnection in hazardous areaConnection to live devices


The USB device does require an external power supply to function because it uses over 500 mA.

The USB device is connected to the mains via other interfaces.


HMI USB Ex(e) connector


cable glands

e. g. Ex d housing

USB - device *3


power supply



USB cable twisted data wires


USB(e) device

Connected to mains via power supply

or other interfaces.



Data cable wires must be twisted right up to terminal.


Vcc (Pin 1) do not connect !


e. g hard disc, CD / DVD - drive, Profibus-Interface.


See also:

Kapitelseite external USB-Devices



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