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11. TROUBLESHOOTING
11.3 How to Check an Error with the LED Lamps
Watchdog timer error occurred.
Watchdog timer error occurred.
Cable is broken or shorted.
Master station stopped link.
24V power is not supplied to the high-speed
counter module or voltage is insufficient.
Station number was repeated.
Switch setting is outside the permissible range
(station number 0 or not less than 62, transmis-
sion speed 5 to 9).
Station number or transmission speed switch
setting was changed during normal operation.
Station number or transmission speed switch is
faulty
This section describes how to check an error using the LED lamps of the high-speed
counter module.
For errors related to the programmable controller CPU and master module, refer to
the programmable controller CPU and master module user's manuals.
(1) If the RUN LED of the high-speed counter module goes off
Cause
(2) If the L RUN LED of the high-speed counter module goes off
Cause
(3) If the L ERR. LED of the high-speed counter module flickers
Cause
Corrective Action
Switch on power of the high-speed counter module again
If the RUN LED is not lit after power is switched on again, the
hardware may be faulty. Please consult your local Mitsubishi
representative.
Corrective Action
Switch on power of the high-speed counter module again
If the L RUN LED is not lit after power is switched on again,
the hardware may be faulty. Please consult your local
Mitsubishi representative.
Check for a broken or shorted cable among transmission
cables and repair it.
Check for an error at master station.
Check the 24V power voltage.
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Switch power on again
after correcting the station number
setting of the module of which station number was repeated.
Correct the switching setting and switch power on again
Corrective Action
Return the station number or transmission speed switch
setting to the old value and switch power on again
If the L RUN LED is not lit after power is switched on again,
the hardware may be faulty. Please consult your local
Mitsubishi representative.
If the L ERR. LED begins to flicker even though switch setting
was not changed during operation, the hardware may be
faulty. Please consult your local Mitsubishi representative.
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MELSEC-A
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