Omron NE1A-SCPU01 - 07-2009 - Page 270

236
Indicator/Display Status and Corrective Actions for Errors Section 12-3
--- E2Ù
Node
address of
error
--- Transmission
Timeout
See note
1.
Transmission
timeout
Check the following points:
• Make sure the baud rate is the
same for all nodes.
• Make sure the cable lengths
(main/branch) are not too
long.
• Make sure the cable is not dis-
connected or loose.
• Make sure terminating resis-
tance is at both ends of the
main line and only at both
ends.
• Make sure that there is not a
lot of noise.
Flashing
red
A0Ù
Node
address of
error
--- Relevant Safety I/O
communication
stopped because of
a Safety I/O
communication
error
Ye s
(See note
2.)
A safety I/O
connection timed
out, interrupting
the relevant I/O
connection.
Check the following points:
• Make sure the baud rate is the
same for all nodes.
• Make sure the cable lengths
(main/branch) are not too
long.
• Make sure the cable is not dis-
connected or loose.
• Make sure terminating resis-
tance is at both ends of the
main line and only at both
ends.
• Make sure that there is not a
lot of noise.
Flashing
red
A1Ù
Node
address of
error
--- All Safety I/O
communication
stopped because of
a Safety I/O
communication
error
Ye s
(See note
2.)
A safety I/O
connection timed
out, interrupting
the relevant I/O
connection.
--- P1Ù
Node
address of
error
Target
terminal
lit red
Paired
terminal
(Dual
Setting)
flashing
red
External Test
Signal Failure at
Safety Input
See note
1.
External wiring
error in safety
input.
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.
--- P1Ù
Node
address of
error
Target
terminal
(Dual
Setting)
lit red
Discrepancy Error
at Safety Input
See note
1.
Discrepancy
error between 2
inputs at safety
input.
--- P1Ù
Node
address of
error
Target
terminal
lit red
Paired
terminal
(Dual
Setting)
flashing
red
Internal Input
Failure at Safety
Input
See note
1.
Internal circuit
failure at safety
input.
Indicators/display Error history Cause Corrective actions
NS Seven-
segment
display
I/O Name Saved in
nonvola-
tile
memory