5. PI/O Module
SAI02 module internal circuitry
102
AI1(+)
V/F converter
Filter
circuit
AI1( - )
Insulated DC/
DC converter
circuit
AI4(+)
AI4( - )
Module connector
System power supply
(24 Vdc)
Signal
isolation
circuit
Internal
Fixed voltage power
power
supply circuit
supply
Status
indicator/
switch
Internal CPU
circuit
RS-485
RS-485
trans-
trans-
ceiver
ceiver
Phase A
Phase B
Dual I/O bus