Installation Guidelines
S5-115U Manual
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
ext
) has to be connected to the internal
reference voltage (M
int
, i.e., PE) (see Figure 3-25). For floating modules, an optocoupler separates
the external voltages from the internal ones.
Reference bus (Mint)
Mext
M
L+
Floating
M
L+
Nonfloating
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.
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