Mitsubishi Electric MELDAS 60 Series Maintenance Manual page 302

(2) Base I/O unit
[Explanation of LED functions]
Name
LED1
(Dual-
color
illumi-
nation)
LED2
(Dual-
color
illumi-
nation)
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Function
24IN 24VDC input check
Communication error
RIO1 display for rotary switch
"CS1" setting station
Internal output voltage
5OUT
check
Communication error
RIO2 display for rotary switch
"CS2" setting station
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2. TROUBLESHOOTING
2.1 List of Unit LEDs
Base I/O unit
CR31
Status
Color
When
normal
Green Lit
Red Not lit
Green Lit
Red Not lit
II-46
CS2 CS1
RIO2 RIO1
DCIN
24IN
RAL1
5OUT
RAL2
Correspondence for error
During
error
Not lit Check 24VDC voltage
Check each remote I/O unit's
Lit
rotary switch station No.
Contact the Mitsubishi Service
Not lit
Center
Check each remote I/O unit's
Lit
rotary switch station No.