Troubleshooting Flowchart; Troubleshooting Category Flow - Mitsubishi MELSEC User Manual

12
TROUBLESHOOTING

12.2 Troubleshooting Flowchart

The trouble investigating methods and remedies of the troubles are described below.

12.2.1 Troubleshooting category flow

This section classifies the error by definition and describes them.
Error-occurrence description
ERR terminal turned off (opened).
"POWER" LED off
"ALIVE" LED off
"RUN" LED off
"RUN" LED flashing
"ERR." LED on/flashing
"USER" LED on
"BAT. " LED on
Unable to read a program
Unable to write a program
The CPU cannot communicate
with the GX Developer
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- 2 12.2 Troubleshooting Flowchart
12.2.1 Troubleshooting category flow
Section 12.2.2
Section 12.2.3
Section 12.2.4
Section 12.2.5
Section 12.2.6
Section 12.2.8
Section 12.2.7
Section 12.2.8
Section 12.2.9
Section 12.2.10
Flowchart for when a program cannot be read
Section 12.2.11
Section 12.2.12
Figure 12.1 Troubleshooting flowchart
Flowchart for when the ERR terminal
(negative logic) is off (opened)
Flowchart for when the "POWER" LED turns off
When the "ALIVE" LED does not come on or is off
Flowchart for when the "RUN" LED turns off
When the "RUN" LED is flashing
Flowchart for when the "ERR." LED turns on or
flashes
When the "USER" LED is on
When the "BAT. " LED is on
Flowchart for when a program cannot be written
Flowchart for when the CPU cannot
communicate with the GX Developer