Omron NE1A-SCPU01 - 07-2009 Operation Manual page 272

Indicator/Display Status and Corrective Actions for Errors
Indicators/display
NS Seven-
segment
display
--- P3
Node
address of
error
--- P3
Node
address of
error
--- P3
Node
address of
error
--- P3
Node
address of
error
--- P3
Node
address of
error
238
Error history
I/O Name
Target Over Current
terminal Detected at Safety
Output
lit red
Paired
terminal
(Dual
Setting)
flashing
red
Target Short Circuit
terminal Detected at Safety
Output
lit red
Paired
terminal
(Dual
Setting)
flashing
red
Target Stuck-at-high
terminal Detected at Safety
Output
lit red
Paired
terminal
(Dual
Setting)
flashing
red
Target Cross Connection
terminal Detected at Safety
Output
lit red
Paired
terminal
(Dual
Setting)
flashing
red
Target Dual Channel
terminal Violation at Safety
(Dual Output
Setting)
lit red
Cause
Saved in
nonvola-
tile
memory
See note Overcurrent was
1. detected at
safety output.
See note Short circuit was
1. detected at
safety output.
See note Stuck-on-high at
1. safety output
See note Short circuit was
1. detected
between output
signal wires at
safety output
See note Output data
1. error at safety
output
Section 12-3
Corrective actions
Check the following points:
• Make sure there is no overcur-
rent for the output.
• Make sure the output signal
wire does not have an earth
fault.
• Make sure the output signal
wire is not contacting the
power source (positive side).
• Make sure there is not a short
circuit between output signal
wires.
To recover from these errors,
the following conditions are
required:
Latch input error time must
have passed, and the root
cause must have been
removed.
The output signal from the user
application for the target safety
output must turn OFF.
Check whether program output
data (for two outputs) in the
Dual Channel Mode are config-
ured as equivalent channels.