
Monitored Digital Input Modules
(T741
1)
12
Industrial Control Services
Figure
7
. Line Monitoring, Single Switch Connected to
Redundant Modules.
With the line monitor device installed, the input voltage, V
in
,
has four possible states as represented in Table
1
. When the
input module reads the input, the reference voltage, V
ref
, is
set to the values shown in Table
1
to detect the state of the
field input and wiring.
Table
1
. Input States and Reference Voltage Thresholds.
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