Omron NE1A Series Manual page 203

Indicator/Display Status and Corrective Actions for Errors
Indicators/display
NS Seven-
segment
display
--- P1
Node
address of
error
--- P1
Node
address of
error
--- P1
Node
address of
error
--- P2
Node
address of
error
--- P2
Node
address of
error
-- P2
Node
address of
error
204
Error history
I/O Name
terminal External Test
Signal Failure at
Safety Input
lit red
Paired ter-
minal
(Dual Set-
ting)
flashing
red
Target ter- Discrepancy Error
minal at Safety Input
(Dual Set-
ting)
lit red
Target ter- Internal Input
minal Failure at Safety
Input
lit red
Paired ter-
minal
(Dual Set-
ting)
flashing
red
No LED Overload Detected
indicator at Test Output
No LED Stuck-at-high
indicator Detected at Test
Output
No LED Under Current
indicator Detected Using
Muting Lamp
Cause
Saved in
nonvola-
tile
memory
See note External wiring
1. error in safety
input.
See note Discrepancy
1. error between 2
inputs at safety
input.
See note Internal circuit
1. failure at safety
input.
See note Overloading was
1. detected at test
output (when a
test output termi-
nal was set as a
standard signal
output).
See note Stuck-on-high at
1. test output (when
a test output ter-
minal was set as
a standard sig-
nal output).
See note Disconnection of
1. indicator light
was detected at
test output (when
Terminal T3 is
set as the mut-
ing lamp signal
output)
Section 10-3
Corrective actions
Check the following points:
• Make sure the input signal
wire is not contacting the
power source (positive side).
• Make sure the input signal
wire does not have an earth
fault.
• Make sure the input signal
wire is not disconnected.
• Make sure there is not a short
circuit between input signal
wires.
• Make sure there is no failure in
the connected devices.
• Make sure the Discrepancy
Time setting values are valid.
To recover from the above
error state, the following condi-
tions are required.
Latch input error time must
have passed and the root cause
must have been removed.
The target safety input terminal
inputs must turn OFF.
To change the discrepancy
time, reconfiguration is
required.
Check whether the output
signal wire has an earth fault or
is over loaded.
For the wires, check if the
power supply source (positive
side) is contacting the output
signal wire. After the latch input
error time has passed, turn OFF
the input after the cause of the
error has been removed. The
error will be reset. If there is no
fault with the wires, replace the
unit.
Check whether the output
signal wire is disconnected. If
there is no error, check the
indicator light.