Analog Input Modules
4-20mA Input Module IOP302
Voltage Input Module IOP305
Metso Automation MAX Controls Inc. • 277596 •
3-3
Channel 1
Channel 16
FLASH
FPGA
I/O Bus
Regulator
24V
uC
OPTO
optical isolation
field to logic
DC/DC
A/D
REF
A/D
REF
Signal
Conditioning
Signal
Conditioning
The input circuit for each channel of the 4-20 mA input module is shown in
the following sketch. An electronic fuse protects the 24V loop power to the
transmitter. A 200-Ohm thermistor in series with the input provides current
limiting for overvoltage conditions up to 100 Volts. The 24-volt supply is
available to the module from the backplane.
Fuse
A/D
100
From backplane
The following sketch shows the input circuit for the voltage-input module.
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