Wiring
4-4
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
4.2 Operating the ET 200X on a grounded supply
In this section, you will find information on the overall configuration of an ET 200X
distributed I/O device on a grounded supply (TN-S system). The specific subjects
discussed are:
Circuit-breaking devices, short-circuit and overload protection in accordance
with DIN VDE 0100 and DIN VDE 0113
Load power supplies and load circuits
Definition: Grounded supply
With grounded supplies, the neutral conductor of the system is grounded. A simple
ground fault between a live conductor and ground or a grounded section of the
plant causes the protective devices to trip.
Components and protective measures
Different components and protective measures are specified for erecting a
complete plant. The types of component and the degree to which the protective
measures are binding depend on the DIN VDE regulation that applies to the
configuration of your plant. The following table refers to Figure 4-1.
Compare ... Ref. to
Fig. 4-1
DIN VDE 0100 DIN VDE 0113
Circuit-breaking device
for PLC, sensors and si-
gnal control elements
... Part 460:
Main switch
... Part 1:
Disconnector
Short-circuit and overload
protection:
Grouped for sensors and
signal control elements
... Part 725:
Single-pole pro-
tection of circuits
... Part 1:
In the case of a grounded
secondary circuit: provide
single-pole protection
Otherwise: Provide
all-pole protection
Safe electrical isolation
Safe electrical isolation must be provided for:
Modules that must be supplied with voltages 60 VDC or 25 VAC
24 VDC load circuits
Configuring the ET 200X with grounded reference potential
When the ET 200X is configured with grounded reference potential, any
interference currents are diverted to the protective ground. The connections must
be connected externally or in the connector (see Figure 4-1).
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