Omron NE1A-SCPU01 - 07-2009 Operation Manual page 270

Indicator/Display Status and Corrective Actions for Errors
Indicators/display
NS Seven-
segment
display
--- E2
Node
address of
error
A0
Node
address of
Flashing
error
red
A1
Node
address of
Flashing
error
red
--- P1
Node
address of
error
--- P1
Node
address of
error
--- P1
Node
address of
error
236
Error history
I/O Name
--- Transmission
Timeout
--- Relevant Safety I/O
communication
stopped because of
a Safety I/O
communication
error
--- All Safety I/O
communication
stopped because of
a Safety I/O
communication
error
Target External Test
terminal Signal Failure at
Safety Input
lit red
Paired
terminal
(Dual
Setting)
flashing
red
Target Discrepancy Error
terminal at Safety Input
(Dual
Setting)
lit red
Target Internal Input
terminal Failure at Safety
Input
lit red
Paired
terminal
(Dual
Setting)
flashing
red
Cause
Saved in
nonvola-
tile
memory
See note Transmission
1. timeout
Yes A safety I/O
(See note connection timed
2.) out, interrupting
the relevant I/O
connection.
Yes A safety I/O
(See note connection timed
2.) out, interrupting
the relevant I/O
connection.
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.
Section 12-3
Corrective actions
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.
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.
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.