SMC Networks D-MH1AD Series Operation Manual page 68

•Display sensor monitor
Problem
Phenomenon
No.
The output stays
ON; the operation
LED stays ON;
1 the output stays
OFF; the
operation LED
stays OFF
The output stays
ON; the
2
operation LED is
normal
The output stays
OFF; the
3
operation LED is
normal
The switch
4 output generates
chattering.
The switch
5 output response
is slow.
Problem Possible
causes
(1) Check the output point setting.
Incorrect output (2) Check the ON width and
settings hysteresis set values.
(3) Set N.O. or N.C.
Product failure
Check the output wiring.
Incorrect wiring Check if the load is directly
connected to DC (+) or DC (−).
Product failure
Check the output wiring.
Incorrect wiring Check if the load is directly
connected to DC (+) or DC (−
Check the SW output specification
Incorrect SW
setting.
output
Check if the SW output is PNP while
specification
NPN is intended to be used (and vice
setting
versa).
Check if there is bending stress
applied to any part of the lead wire.
Broken lead wire
(bending radius, tensile force to the
lead wire)
Product failure
Check the wiring.
Check if the brown and blue wires are
connected to DC (+) and DC (−)
Mis wiring
respectively, and if the output line is
secure (contact failure).
(1) Check the output point setting.
(2) Check if the ON width or
Incorrect
hysteresis range is too small.
output point
(3) Check the delay time setting.
settings
Check if the delay time is too
short.
Product failure
Incorrect delay
Check to see if the delay time and
time and filter
filter time settings are appropriate.
time settings
-67-
Investigation method Countermeasures
(1) Set the output point
again.
(2) Set the ON width and
hysteresis set values
again.
(3) Set the output again.
Replace the product.
Connect the wire
correctly.
Replace the product.
Check and correct the
wiring.
Set the SW output
specification again.
Correct the wiring.
(Correct the tensile force and
increase the bending radius)
Replace the product.
Connect the wire correctly
again.
(1) Set the output point
again.
(2) Increase the ON width
or hysteresis.
(3) Set up the function again.
Replace the product.
Set up the function again.
No.D-※S-OMA1021