Analog Input Modules
3-Wire RTD Module IOP 303
Metso Automation MAX Controls Inc. • 277596 •
4-3
via the bus FPGA. The FPGA provides the I/O bus interface logic; its
program is loaded from the FLASH on power up.
Module calibration is done automatically at power up following startup
diagnostics. Calibration is repeated periodically online to compensate for
temperature effects.
Channel 1
Channel 8
FLASH
Field
Interface
I/O Bus
Regulator
24V
uC
DC/DC
5V - field
OPTO
optical isolation
field to logic
A/D
REF
Excitation
Field
Interface
Circuits
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