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362
Monitoring of DC analog measurements
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On
On
x
x
* Please see the setting parameters in the Technical reference manual for further explanation
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The design of the mA input modules follows the design of all REx 5xx-series protec-
tion, control, and monitoring terminals that have distributed functionality, where the de-
cision levels are placed as closely as possible to the process.
Each independent measuring module contains all necessary circuitry and functionality
for measurement of six independent measuring quantities related to the corresponding
measured direct currents.
On the accurate input shunt resistor (R), the direct input current (from the measuring
converter) is converted into a proportional voltage signal (the voltage drop across the
shunt resistor is in proportion to the measured current). Later, the voltage signal is pro-
cessed within one differential type of measuring channel (figure 197).
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Off
0
Off
t>0
The new measured value is reported
only if one of the dead-band limits was
exceeded
The new measured value is updated at
least after the time t period expired. If
the dead-band supervision is addition-
ally selected, the updating also occurs
when the corresponding dead-band
limit was exceeded (periodic reporting
with parallel dead-band supervision)
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