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Nonfloating I/O modules work according to the following principle (see Fig-
ure 3-21):
Reference potential is the M line (chassis ground of the control circuit). A
voltage drop on line
Reference potential is terminal 2 (M) of the terminal block. A voltage drop
V
way lowers the resulting control voltage V
For a nonfloating configuration, make sure that the voltage drop on lines
and
modules can malfunction (see Figure 3-21).
L+
24 V DC Supply
M
Figure 3-21 Simplified Illustration of a Configuration with Nonfloating I/O Modules
ET 200U Distributed I/O Station
EWA 4NEB 812 6087–02b
Input modules:
affects the input signal level V
Output modules:
on line
increases the chassis ground of the output driver and in this
2
never exceeds 1 V. Otherwise the reference potentials shift and the
ET 200U
interf. mod.
L+
M
1
D V
1
D V
2
Mechanical and Electrical Configuration
I.
(see Figure 3-21).
ST
V
ST
V
E
2
1
2
+ 9 V
Data
GND
3-29
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