2. System component
23
Fig. 2.18 SAO012 module internal circuit
Fig. 2.19 SAO012 module front part
RUN indicator: Illuminates when normal
Alarm indicator: Blinks upon an error
Module address setting switch:
Set the module number 1 to E (1 to 14).
RS-485
transceiver
Module connector
State
display/switch
D/A conversion
circuit with
analog
read-back
Constant voltage
power circuit
RS-485
transceiver
Internal
power supply
System power supply
(DC24V)
Redundancy I/O bus
Signal
insulating
circuit
Internal CPU
circuit
nalog circuit
power supply
Insulation DC/DC
converter
Bus A Bus B
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