Omron F3SJ Series Original Instructions Manual page 206

Appendix
Emitter Receiver
C
B
A
*2 When an error occurred, a supply voltage error may be recorded in addition to the original error
code if supply voltage is out of specification range.
F3SJ-A
186
User's Manual
Error code Error Description
Error code Effect of noise.
other than
C
those above
B
A
Lockout of other
F3SJ in the series
connection
Failure of F3SJ's
internal circuit.
Cause
Effect of noise is excessive.
Failure occurred in another F3SJ
under series connection.
F3SJ's internal circuit is damaged. Replace the F3SJ.
Solution
If other devices using the same
power supply generate noise, do
not share the same power supply
with other devices and use it as
that exclusive for the safety
component.
The inductive noise tends to be
induced especially if the power
line and the power supply line are
arranged in parallel. Arrange the
exclusive power supply near the
light curtain or lay the power line
away from the power line.
If the power supply for operation
is located near the power supply
and it uses the same ground, it is
subject to the influence of
common mode noise from the
ground. Separate the grounding
point or use it as the exclusive
ground.
Solve the problem of F3SJ in a
series connection.