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Troubleshooting
20.2.2 When Not Switched to RUN Mode
Situation
When a syntax error occurs or running stops, a self-diagnostic error occurs.
Solution
Confirm the situation according to the following steps.
PROCEDURE
1. Confirm whether the ERR LED is lit or not.
2. Use the tool software to perform "Totally Check Project" to confirm the
syntax error.
20.2.3 When ERR.LED Lights Up
Situation
The system monitoring timer is in operation, the controller stops running.
Solution
PROCEDURE
1. Switch to PROG. mode and turn on the power supply again.
If the ERR. LED lights again, it may be due to abnormal unit. If off, it may be
caused by interference and other temporary reasons.
2. Switch to RUN mode.
If the ERR. LED lights up after switching to RUN mode, it means that the program
has timed out. Rerun the program.
3. Check the surrounding environment to confirm if there is interference.
If the program itself is OK, it may be due to the surrounding environment. Check
wirings (includes grounding wire).
KEY POINTS
•
When rechecking the program, confirm the following items.
Example 1) Confirm whether the program is an infinite loop according to the
instructions controlling JP instruction, LOOP instruction and other program
processes.
Example 2) The interrupt instruction is continuously executed?
20-6
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