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Error History Section 12-4
EM Transmission Error
(Destination Device
Absence)
Unable to transmit
because the destination
device is not on the
network.
Check the following points:
• Node address of the destination node
• Node address of the transmission message
• Make sure the power supply voltage for the destination node is set
within the specification range.
• Make sure the baud rate is the same for all nodes.
• Make sure the cable lengths (of main/branch lines) are not too
long.
• Make sure a cable or wire is not disconnected or loose.
• Make sure terminating resistance is at both ends of the main line
and only at both ends.
• Make sure there is not a lot of noise.
EM Transmission Error
(Destination Buffer Full)
Unable to transmit
because the destination
buffer was busy.
Check the message receive size at the destination node.
EM Transmission Error
(Command Length
Error)
Unable to transmit
because the command is
longer than the maximum
length.
Check the response message size from the destination.
Or check that the response size expected in the request message
is correct.
EM Transmission Error
(New Request
Received)
Message was deleted due
to receiving the new
request.
No
Received Error
Response (UEM)
Receiving an error
response when the user
explicit message function is
used.
Check that the specified service or data size in the user explicit
message matches the destination object specifications.
Error Related to Power Supply for I/O
Input PS Voltage Low I/O power supply (input) is
not connected.
Check the following points:
• Make sure the power supply voltage is set within the specification
range.
• Make sure that a cable or wire is not disconnected.
Output PS Voltage Low I/O power supply (output) is
not connected.
Safety Input Terminal-related Failures
External Test Signal Fail-
ure at Safety Input
Failure in the external wire
at 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 a failure had not occurred in the connected
device.
• Make sure the set value of discrepancy time is valid.
To recover from these failures, the following conditions 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.
When changing the discrepancy time, reconfiguration is required.
Discrepancy Error at
Safety Input
Discrepancy error
between two inputs at
safety input
Internal Input Failure at
Safety Input
Internal circuit failure at
safety input
Replace the unit if the system failure still occurs after cycling the
power supply.
Test Output Terminal-related Failures
Overload Detected at
Test Output
Overloading was
detected at test output.
Check whether the output signal wire has an earth fault or is over-
loaded.
Stuck-at-high Detected
at Test Output
Stuck-at-high at test
output
Check whether the power source (positive side) is contacting the
output signal wire. After the latch input error time has passed, turn
OFF the input when the cause of the error has been removed, and
the error will be reset. If there is no fault with the wires, replace the
unit.
Under Current
Detected Using Muting
Lamp
Lower limit error of
current was detected at test
output.
Check whether the output signal wire is disconnected.
If there is no fault with the wires, check the indicators.
Message Corrective Actions
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