Mitsubishi Electric MELDAS C6 Maintenance Manual page 153

[Explanation of LEDs]
L1 R1
L2 R2
L3 R3
L4 R4
L5 R5
L6 R6
L7
R7
L8
R8
LED name
ON : Unit is normal
L1 RUN
OFF : Watch dog timer error has occurred.
Indicates the state of communication with
station set in parameters.
ON
L2 ERR.
Flicker : Station with communication error
L3 MST ON : Set as master station
L4 S MST ON : Set as standby master station
L5 LOCAL ON : Set as local station
ON : Communicating with NC CPU
L6 CPU R/W
L7 L RUN ON : Executing data link (local station)
ON
L8 L ERR.
Flicker : Switch setting was changed while
R1 SW ON : Switch setting is incorrect
ON : A master station already exists on
R2 M/S
E
R
R3 R PRM ON : Error found in parameter details
O
ON : Data link monitor timer functioned
R
R4 TIME
ON : Cable is broken or transmission path
R5 LINE
R6
R7 SD ON : Sending data
R8 RD ON : Receiving data
2. EXPLANATION OF MODULE FUNCTIONS
2.8 HR865 Card
Details
: Error in communication with all
stations
round
(FROM/TO)
: Communication error
(local station)
power is ON
same line
(all-station error)
is being affected by noise, etc.
II - 15
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LED display status
Master station Local station
(Standby master (Standby master
station)
When When When
normal abnormal normal
ON OFF ON
OFF ON/flicker OFF
ON – OFF
ON – ON
OFF – ON
ON OFF ON
ON OFF ON
OFF ON/flicker OFF
OFF ON OFF
OFF ON –
OFF ON –
OFF ON –
OFF ON OFF
– – –
ON OFF ON
ON OFF ON
station)
When
abnormal
OFF
ON/flicker
–
–
–
OFF
OFF
ON/flicker
ON
–
–
–
ON
–
OFF
OFF