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MELSEC-Q
9 TROUBLESHOOTING
9.2 The Module Does Not Start Counting Operation
Check item Action
Doesn't the CPU module indicate an error?
If the LED on the CPU module indicates an error, correct the
error with reference to troubleshooting in the CPU module's
manual for normal operation.
Do the LEDs of
φ
A and
φ
B turn ON by directly applying
voltage using such as voltage stabilizer to pulse input
terminals of
φ
A and
φ
B?
If they turn ON, check the external wiring and encoder side
and correct the error.
If they remain OFF, it is a hardware failure. Please consult
your local Mitsubishi representative.
Is the external wiring of
φ
A and
φ
B normal? Check the external wiring and correct the error.
Is CH Count enable command (Y4, YC) on?
Turn on CH
Count enable command (Y4, YC) using a
sequence program.
Are the pulse input method and pulse input mode set with
the intelligent function module switch setting the same?
Match the pulse input method with the pulse input mode made
on the intelligent function module switch setting.
Is CH Counter function selection start command (Y6,
YE) off or is a voltage not applied to the function start
input terminal?
If the count disable function is selected, turn off CH Counter
function selection start command (Y6, YE) or the function start
input terminal.
Is an overflow error occurring? Preset to clear the overflow error.