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MELSEC-Q
11 TROUBLESHOOTING
11.2 Troubleshooting
The trouble investigating methods, contents of troubles for the error codes, and
remedies of the troubles are described below.
11.2.1 Troubleshooting flowchart
The following shows the contents of the troubles classified into a variety of groups
according to the types of events.
"MODE" LED off
Error-occurrence description
"POWER" LED off
"RUN" LED flickering
"ERR." LED on/flickering
"USER" LED on
"BAT. " LED on
I/O module not operating properly
Unable to write a program
Unable to perform boot operation
from memory card
Proceed to Section 11.2.2,
"Flowchart for when the "MODE" LED is not turned on."
Proceed to Section 11.2.6,
"When the "RUN" LED is flickering."
Proceed to Section 11.2.8,
"When the "USER" LED is turned on."
Proceed to Section 11.2.9,
"When the "BAT. " LED is turned on."
Proceed to Section 11.2.12
"Flowchart for when output load of output module
dose not turn on."
Unable to read a program
UNIT. VERIFY ERR. occurs.
CONTROL BUS ERR. occurs.
Proceed to Section 11.2.4,
"Flowchart for when the "POWER" LED is turned off."
Proceed to Section 11.2.7,
"Flowchart for when the "ERR." LED is on/flickering."
Proceed to Section 11.2.13,
"Flowchart for when unable to read a program."
Proceed to Section 11.2.14,
"Flowchart for when unable to write a program."
Proceed to Section 11.2.15,
"Flowchart for when unable to perform boot
operation from memory card."
Proceed to Section 11.2.16,
"Flowchart for when UNIT. VERIFY ERR. occurs."
Proceed to Section 11.2.17,
"Flowchart for when CONTROL BUS ERR. occurs."
"RUN" LED off
Proceed to Section 11.2.5,
"Flowchart for when the "RUN" LED is turned off."
"MODE" LED flickering
"BOOT" LED flickering
Proceed to Section 11.2.3,
"Flowchart for when the "MODE" LED is flickering."
Proceed to Section 11.2.10,
"Flowchart for when the "BOOT" LED is flickering."
Proceed to Section 11.2.11,
"Flowchart for when output module LED is not turned on"
Output module LED not turned on
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