3.4.3
Connecting Non-Floating or
Floating Modules
Shown in the following sections are the specical features when
installing non-floating and floating modules.
Installation with
non-floating modules
In an installation with non-floating modules, the reference potentials
of the control circuit (0 V
int
) and load circuits (0 V
ext
) are electrically
connected.
The reference potential of the control circuit (0 V
int
) is given by the
PE or protective conductor terminal and must be connected to the
reference potential of the load circuit via an externally laid conductor.
Shown in the following figure is a simplified installation with
non-floating modules. The arrangement is independent of the
grounding concept. The connections for grounding are therefore not
drawn.
The voltage drop on line
➀
must not exceed 1 V. Otherwise there will
be a shift in reference potentials resulting in module malfunctions.
Figure 3-11
Simplified Representation of an Installation with Non-Floating Modules
Power Supplies for Programmable Controllers and I/Os
System Manual
3 - 28
C79000-B8576-C199-03
