Installation and wiring
3.7 Operating the ET 200S on a grounded supply
EIP-200S Ethernet/IP Adapter Distributed I/O System
System Manual, 06/2018, A5E44345053-AB
63
In a grounded supply, the neutral conductor of the system is grounded. A mere ground fault
between a live conductor and ground or a grounded section of the plant causes the
protective devices to trip.
Safe electrical isolation
Safe electrical isolation must be provided for:
● Modules that must be operated at the following voltages: v60 VDC or v25 VAC
● 24 VDC operating current circuits
Setting up the ET 200S with ungrounded reference potential
The reference potential M of the rated supply voltage for the interface module is connected
to the rail (protective conductor) by means of an RC combination, therefore making an
ungrounded configuration possible.
To divert interference current, the reference potential of the interface module is connected
internally to the rail (protective conductor) via an RC combination (R = 10 MΩ / C = 22 nF).
High-frequency interference currents are thus discharged, and static charge is prevented.
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