Chapter 8. TROUBLESHOOTING
8 - 4
8.2.3
Count Value I s I ncorrect
Count value abnormal
Is the count value
conforming to the
input specifications?
Correct the counter input
conforming to the input
specifications.
Is the DIP switch
correctly set?
Is the input wire a
shielded twist wire?
Have adequate
measures been taken
against noise.
Is enough clearance
given between heavy
current equipment and
counter input line?
Are count values the
same by providing the
same count inputs to Ch0
and Ch1.
Does the frequency
of the input wave
exceed 50 Kpps?
HW Fault
No
Yes
No
Check the input waveform
with an oscilloscope.
Re-check the pulse input
Set the DIP switch correctly
conforming to input
conditions.
Use a shielded twisted wire
for counter input wiring.
Remove noise the sources
Separate the counter input
line 10 cm or more from the
power line.
HW Fault
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Yes