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Installation Guidelines
3.3.2
Connecting Digital Modules
Digital modules are available in nonfloating and floating versions. For the nonfloating modules,
the reference voltage of the external process signals (M
reference voltage (M
, i.e., PE) (see Figure 3-25). For floating modules, an optocoupler separates
int
the external voltages from the internal ones.
Figure 3-25. Connection to Floating and Nonfloating Modules
Note
See Chapter 6 "Addressing/Address Assignment" for information on address assign-
ment in the case of digital modules.
3-30
Floating
L+
M
) has to be connected to the internal
ext
Nonfloating
L+
M
Mext
Reference bus (M int )
EWA 4NEB 811 6130-02b
S5-115U Manual
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