Batt (Bat) Led [Lit Or Unlit] [Fx 3U /Fx 3Uc ]; Alm Led [Lit Or Unlit] [Fx 3G ]; Error (Err) Led [Lit, Flickering Or Unlit] [Fx; Fx 3Uc ] - Mitsubishi Electric FX3G SERIES Programming Manual
Programmable controllers
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Also See for FX3G SERIES:
- User manual (532 pages) ,
- Hardware manual (8 pages) ,
- Quick start manual (2 pages)
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FX
/FX
/FX
Series Programmable Controllers
3G
3U
3UC
Programming Manual - Basic & Applied Instruction Edition
38.1.3
BATT (BAT) LED [lit or unlit] [FX
LED status
Lit
The battery voltage is low.
The battery voltage exceeds the value set in
Unlit
D8006.
38.1.4
ALM LED [lit or unlit] [FX
This LED is valid when the optional battery is installed and the battery mode is selected using a parameter.
LED status
Lit
The battery voltage is low.
The battery voltage exceeds the value set in
Unlit
D8006.
38.1.5
ERROR (ERR) LED [lit, flickering or unlit] [FX
LED status
A watchdog timer error has occurred, or
Lit
the hardware of the PLC may be
damaged.
One of the following errors occur in PLC:
•
Flickering
•
•
Unlit
Error which stops PLC has not occurred.
/FX
3U
PLC status
]
3G
PLC status
PLC status
Parameter error
Syntax error
Circuit error
38 Error Check Method and Error Code List
38.1 States and Colors of LEDs PLC Operation Status
]
3UC
Replace the battery as soon as possible.
(Refer to FX
/FX
Hardware edition.)
3U
3UC
The battery is normal.
Replace the battery as soon as possible.
(Refer to FX
Hardware edition.)
3G
The battery is normal.
/FX
/FX
3G
3U
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
Action
]
Action
31
32
33
34
35
36
37
38
A
B
877
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