Fx 3U /Fx 3Gc /Fx 3Uc; Error (Err) Led [Lit, Flickering Or Unlit] [Fx 3G /Fx 3U /Fx 3Gc /Fx 3Uc ]; L Run Led [Fx 3Uc -32Mt-Lt(-2)] - Mitsubishi FX3G Series Programming Manual

FX /FX /FX /FX
3G 3U 3GC 3UC
Programming Manual - Basic & Applied Instruction Edition
38.1.5 ERROR (ERR) LED [lit, flickering or unlit] [FX
LED status
Lit
Flickering
Unlit
38.1.6 L RUN LED [FX
Mode LED status
ONLINE
*1
CONFIG
TEST
*1. FX -32MT-LT only.
3UC
870
Series
PLC status
A watchdog timer error has occurred, or
the hardware of the PLC may be
damaged.
One of the following errors occur in PLC:
• Parameter error
• Syntax error
• Circuit error
Error which stops PLC has not occurred.
-32MT-LT(-2)]
3UC
PLC status
Lit Data link is executing
Unlit Data link is stopped
Lit Data link is executing
Unlit Data link is stopped
The self-loopback test is
Lit
normally finished.
The self-loopback test is
abnormally finished.
Unlit (This LED is off
while the self-loopback test
is executing.)
38 Error Check Method and Error Code List
38.1 States and Colors of LEDs PLC Operation Status
/FX /FX /FX
3G 3U 3GC 3UC
1) Change the PLC mode to STOP, and turn ON the PLC power
again.
When the ERROR (ERR) LED is off, a watchdog timer error
occurred. Take one of the following actions:
- Review the program, and make sure that the maximum
value (D8012) of the scan time is not larger than the set
value (D8000) of the watchdog timer.
- Make sure that an input used for input interrupt or pulse
catch does not abnormally turn ON and OFF several times
in one scan time.
- Make sure that the frequency of the pulse (duty: 50%) input
to a high-speed counter is within the specifications range.
- Adding a WDT instruction
Use two or more WDT instructions in a program so that the
watchdog timer is reset several times in one scan time.
- Change the set value of the watchdog timer
Change the set value (D8000) of the watchdog timer in a
program so that it is larger than the maximum value (D8012)
of the scan time.
2) Remove the PLC, and connect another power supply to the
PLC.
If the ERROR (ERR) LED is off, the cause of the error may be
noise. Examine the following action:
- Check the wiring for grounding, and then review the wiring
route and installation location.
- Add a noise filter in the power line.
3) If the ERROR (ERR) LED is not off even after the step 1) or 2),
consult a Mitsubishi Electric representative.
Execute PLC diagnostics and program check by programming tool.
For instructions, refer to Section 38.4.
If PLC operation is a failure, execute the PLC diagnostics or
program check by programming tool.
An I/O configuration error, serial communication error, or operation
error may occur.
Action
• Take action according to the L ERR LED status.
• Take action according to the L ERR LED status.
• Make sure that the power is correctly supplied to the PLC.
• If the L RUN LED is not off even after the above check, consult a
Mitsubishi Electric representative.
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Action
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