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Installation Guidelines
3.4.3 Connecting Nonfloating and Floating Modules
The following sections show the special features involved in installations with nonfloating and
floating modules.
Installation with nonfloating modules
In installations with nonfloating modules, the reference potential of the control circuit (M
and the load circuits (M
external
The reference potential of the control circuit (M
connected to the reference potential of the load circuit via a line to be run externally.
Figure 3.33 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:
PS
1L+
-
1L
PE
Control power
supply
2L+
-
2L
24 V DC load power
supply
Figure 3-33. Simplified Representation of an Installation with Nonfloating Modules
Voltage drop on line
result in module failures.
3-40
) are galvanically isolated.
internal
CPU
External connection for
uniform reference potential
must not exceed 1 V, otherwise the reference potentials will shift and
) is at the PE terminal or
DI
DQ
S5-115U Manual
)
internal
and must be
U int
Data
M int
EWA 4NEB 811 6130-02b
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