C Ounter Value Is Incorrect - LG MASTER-K Series User Manual

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