Analog Input Modules
Isolated Input Module IOP301
Metso Automation MAX Controls Inc. • 277596 •
2-3
The input circuit configuration for each type of input is shown in the
following sketch. An electronic fuse protects the 24-volt loop power to the
transmitter. A 200-Ohm thermistor in series with the 4-20 mA input provides
current limiting for voltages up to 100 Volts. The 24-volt loop supply is
available to the module from the backplane. For current inputs with external
shunt the channel is configured for voltage input and Rs = 0.
1D
1C
1E
200
1D
1C
1E
1D
1C
1E
200
200
100
100
100
-
+
Rp
24V(-)
24V(+)
Xmitter
Rs
4-20 ma powered by system
Voltage input
4-20 ma powered externally,
internal shunt
2
1
1A
1A
A/D
A/D
Rp
Voltage
Rs
2
1
Rp
Xmitter
Rs
2
1
A/D
-
-
+
-
From backplane
1B
1B
1A 1B
24V
+
-
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