Maintenance; Troubleshooting - Mitsubishi Electric FX3S-10MR/ES Quick Start Manual

FX3S QUICK START MANUAL
n PROGRAM MODIFICATION FUNCTION
The sequence program can be transferred while the PLC is running or
in the stopped state as shown below.
X: Effective – : Ineffective
Item
Batch Writing of File Registers (D)
Partial Modification of Program
Writing of
Program to
Modification of whole Program
PLC
(Batch Writing)
Writing of Parameters to PLC
Writing of Comments to PLC

7. MAINTENANCE

This PLC does not incorporate consumable parts that are factors in the
reduction of service life. However, the output relays (points of contact)
have a limited life expectancy.
n PERIODIC INSPECTION
Check the following points.
Check that the temperature in the panel is not abnormally
„ „
increased by other heat generating bodies or direct sunlight.
Check that dust or conductive dust has not entered the panel.
„ „
Check for loosening of wiring and other abnormalities.
„ „

8. TROUBLESHOOTING

n TROUBLESHOOTING WITH LEDS
When trouble occurs, check the LEDs on the PLC to identify the
problem with the PLC.
State of
State of PLC
LED
Power of the specified voltage
On is being correctly supplied to
the power supply terminal.
One of the following problems
may have occurred.
• Power of the specified
voltage and current is not
Flashing
being supplied to the power
supply terminal.
• External wiring is incorrect.
• Internal error of PLC
One of the following problems
may have occurred.
• The power supply is off.
• External wiring is incorrect.
Off • Power of the specified
voltage is not being
supplied to the power
supply terminal.
• The power cable is broken.
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In Running In Stopped
Status Status
–
X
X X
–
X
–
X
–
X
Remedies
The power supply is normal.
Check the supply voltage.
• After disconnecting the cables other
than the power cable, re-apply
power to the PLC, and check
for changes in the state. If the
problem persists, consult your local
Mitsubishi Electric representative.
• If the power is not off, check the
power supply and the power supply
route. If power is being supplied
correctly, consult your local
Mitsubishi Electric representative.
• After disconnecting the cables other
than the power cable, re-apply
power to the PLC, and check
for changes in the state. If the
problem persists, consult your local
Mitsubishi Electric representative.
n ERR LED [ON/FLASHING/OFF]
State of LED State of PLC Remedies
1. Stop the PLC, and re-apply power. If ERR
A watchdog timer
error may have
occurred, or the
On
hardware of the
PLC may be
damaged.
2. Remove the PLC and supply power to it from
3. If the ERR LED does not go off even after
One of the
following errors
has occurred in
Perform PLC diagnosis and program check with
Flashing the PLC.
the programming tool.
• Parameter error
• Syntax error
• Ladder error
If the operations of the PLC are abnormal,
No errors that
perform PLC diagnosis and program check with
Off stop the PLC have
the programming tool. An I/O error, Comms error
occurred.
or Runtime error may have occurred.
LED goes off, a watchdog timer error may
have occurred. Take any of the following
measures.
• Review the program. The maximum value
(D8012) of the scan time should not exceed
the setting (D8000) of the watchdog timer.
• Check that the input used for input
interruption or pulse catch is not being
abnormally turned on and off in one scan.
• Check that the frequency of the pulse (duty
of 50%) input to the high-speed counter
does not exceed the specified range.
• Add the WDT instructions. Add some WDT
instructions to the program, and reset the
watchdog timer several times in one scan.
• Change the setting of the watchdog timer.
Change the watchdog timer setting (D8000)
in the program so that the setting is larger
than the maximum value of the scan time
(D8012).
another power supply on a desk. If the ERR
LED goes off, noise may have affected the
PLC. Take the following measures.
• Check the ground wiring, and reexamine the
wiring route and installation location.
• Fit a noise filter onto the power supply line.
the measures stated in (1) and (2) are taken,
contact Mitsubishi Electric at
Amzsupport@meau.com.