Installation Guidelines
S5-90U/S5-95U
3.4.3 Connecting Non-Floating and Floating Modules
The following sections show the special features involved in installations with nonfloating and floating
modules.
Installation with Non-Floating Modules
In installations with non-floating modules, the reference potential of the control circuit (M
internal
) and
the load circuits (M
external
) are not galvanically isolated.
The reference potential of the control circuit (M
internal
) is at the PE terminal or
and must be
connected to the reference potential of the load circuit via a line to be run externally.
Figure 3-29 shows a simplified representation of an installation with nonfloating modules. The
installation is independent of the grounding concept. The connections for the grounding measures
are therefore
not shown:
Figure 3-29. Simplified Representation of an Installation with Non-Floating Modules
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1L+
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1L
-
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CPU
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DI
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DO
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PS
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2L+
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2L
-
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PE
Control power
supply
24 V DC load power
supply
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External connection for
uniform reference potential
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Data
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Mint
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a a a a a
Uint
Voltage drop on line must not exceed 1 V, otherwise the reference potentials will shift and result
in failures of the module.
3-30
EWA 4NEB 812 6115-02b
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