2. System component
25
Fig. 2.20 SDI01 module internal circuit
Fig. 2.21 SDI01 module front part
RS-485
transceiver
Module connector
State
display/switch
Filter
circuit
Constant voltage
power circuit
RS-485
transceiver
Internal power
supply
System power supply
(DC24V)
Redundancy I/O bus
Internal CPU
circuit
Bus A Bus B
External power supply
External power supply
monitoring
RUN indicator: Illuminates when normal
Alarm indicator: Blinks upon an error
Input data indicator:
Display changes by 16 points.
Data group indicator
Module address setting switch:
Set the module number 1 to E (1 to 14).
Display changeover switch:
Switches between display data by 16 points.
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