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11.5
Troubleshooting for Each Phenomenon
This section describes troubleshooting for each phenomenon.
Perform troubleshooting for each phenomenon when the high-speed counter module does not operate properly with
no error. When an error occurs in the high-speed counter module, identify the error cause with GX Works2.
11.5.1
When the setting on the operation mode setting is the normal
mode
(1) When the module does not count or perform normal count
(a) When the module does not count
(b) When the module does not count normally
Check item
Action
Is CH
Count enable command (RY24, RY3C) on?
Turn on CH
Count enable command (RY24, RY3C) in a program.
Is CH
Function input terminal (FUNC1, FUNC2) off?
If the count disable function is selected for the counter function selection setting,
pulses are not counted while CH
Function input terminal (FUNC1, FUNC2) is
on. Turn off CH
Function input terminal (FUNC1, FUNC2).
Is the pulse input method the same as what has been
selected in CH
Pulse input mode (address: 0122
H
,
0142
H
)?
Change the pulse input method or the setting in CH
Pulse input mode
(address: 0122
H
, 0142
H
) so that they match.
Does the CPU module indicate any error?
If an error is indicated with the CPU module, refer to troubleshooting on the
user's manual for the CPU module used.
Is the external wiring to
φ
A and
φ
B correct?
Check the external wiring and correct errors.
Do the LEDs of
φ
A and
φ
B turn on by applying a voltage
to the pulse input terminals in
φ
A and
φ
B using devices
such as a voltage stabilizer?
If the LEDs of
φ
A and
φ
B turn on, check the external wiring and wiring on the
encoder side.
If the LEDs of
φ
A and
φ
B do not turn on, a module failure may be the cause.
Please consult your local Mitsubishi representative.
Check item
Action
Does a program used read out the present value in unit
of 2 words (32 bits)?
Read out it in unit of 2 words (32 bits).
Is the preset value within the count range of the ring
counter when the counter format is the ring counter?
Set the preset value so that the value is within the count range of the ring
counter.
Measures
against
noise
Are the shielded twisted pair cables used
for pulse input wiring?
Use the shielded twisted pair cables for pulse input wiring.
Are measures against noise taken for the
adjacent devices and inside the control
panel?
Take noise reduction measures such as attaching a CR surge suppressor to the
magnet switch.
Is the distance between the high voltage
equipment and pulse input line kept
enough?
Bundle up the pulse input lines in a single tube, and keep a distance of 150mm
or more between the pulse input lines and the power line even inside the control
panel.
Does any noise come from the grounded
part of the high-speed counter module?
Separate the grounding cable of the high-speed counter module from the
grounded part.
If the case of the high-speed counter module touches the grounded part,
separate it.
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