Specifications
10–29
Troubleshooting
Publication
1747-6.2
Troubleshooting Your Output Modules
If your
Output
Circuit
LED is
And Your
Output Device
is
And Probable Cause Recommended Action
On/Energized
Your
program
indicates that the
output circuit is of
f or
the output circuit will
not tu n o
.
Programming problem.
Check for duplicate outputs and addresses using the search
function.
If using subroutines, outputs are left in their last state when not
executing subroutines.
Use the force function to force output of
f. If this does not force the
output of
f, output circuit is damaged. If the output does force of
f,
then check again for logic/programming problem.
n
t out ut ci cuit ill
not turn of
f.
Output is forced on in program.
Check processor FORCED I/O or FORCE LED and remove forces.
On
Output circuit is damaged.
Use the force function to force the output of
f. If this forces the
output of
f, then there is a logic/programming problem. If this does
not force the output of
f, the output circuit is damaged. T
ry other
output circuit. Replace module.
You
r
o
ut
p
u
t
d
ev
ic
e
Low or no voltage across the
load.
Measure the source voltage and check specifications.
Off/De-energized
You
r
o
ut
p
u
t
d
ev
ic
e
will no
t t
ur
n on a
nd
t
oa inicat
Incorrect wiring or open circuit.
Check wiring and COMmon connections.
Off/De
-
e
n
erg
iz
ed
t
h
e
p
r
o
gr
a
m
in
d
icat
es
that it is on.
Output device is incompatible.
Check specifications and sink/source compatibility (if DC output).
t
h
at it i
s
on.
Output circuit is damaged.
Check wiring. T
ry other output circuit. Replace module.
Output device is incompatible. Check specifications.
nn iz
You
r o
utpu
t d
evice
ill no
t t
u
n o a
n
Output circuit Of
f-state leakage
current may exceed output
device specification.
Check specifications. Use load resistor to bleed of
f leakage current.
See output specifications.
On/Energized
w
ill no
t t
u
r
n o
f
f
a
n
d
th
e p
rogram indicates
t at it i o .
Incorrect wiring.
Chec
k w
iring
. D
isconnec
t f
ro
m S
L
C a
nd verify devic
e o
peration.
that it is off.
Output device is shorted or
damaged.
V
erify device operation. Replace device.
Output circuit is damaged.
Check wiring. T
ry other output circuit. Replace module.
Off
Off/De-energized
Y
our program
indicates that the
output circuit is on or
t
he
out
p
ut ci
r
cuit
w
ill
Programming problem.
Check for duplicate outputs and addresses using search function.
If using subroutines, outputs are left in their last state when not
executing subroutines.
Use the force function to force output on. If this does not force the
output on, output circuit is damaged. If the output does force on,
then check again for logic/programming problem.
t
he
out
p
ut ci
r
cuit
w
ill
not turn on.
Output is forced of
f in program.
Check processor FORCED I/O or FORCE LED and remove forces.
Output circuit is damaged.
Use the force function to force the output on. If this forces the
output on, then there is a logic/programming problem. If this does
not force the output on, the output circuit is damaged. T
ry other
output circuit. Replace module.