Omron DST1-ID12SL-1, Operation Manual

Page: 142 / 182

118
Error History Section 7-3
7-3 Error History
The DST1-series Safety I/O Terminals internally store up to 10 error history
records. The history is updated each time an error occurs. When more than
ten records exist, the oldest record will be deleted. The error history can be
read using the Network Configurator.
Message Countermeasure
DST1 Series System Failures
System Failure Check to see if the positive side of the power supply is in contact with
the signal line.
Replace the DST1 if the system failure still occurs after turning ON the
power.
Invalid Configuration Configure the DST1 correctly.
DeviceNet Communications Errors
Switch Setting Mismatch Check to see if the node address is the same as the node address used
for the previous configuration.
If not, set the node address to that of the previous configuration, or con-
figure the DST1 again.
If the error occurs again, replace the DST1.
Duplication MAC ID Check the node addresses of other nodes.
After setting the node addresses to eliminate address duplication, turn
ON the power to the DST1 again.
Transmission Timeout Check the following items.
• Are cable lengths (trunk and branch lines) correct?
• Are cables broken or loose?
• Are Terminating Resistors connected to both ends of the trunk line
and only to both ends of the trunk line?
• Is noise interference excessive?
Bus off
Standard I/O Connection Timeout
Safety I/O Connection Timeout
Test Output Terminal-related Failures
Stuck-at-high Detected at Test Output Check to see if the positive side of the power source is in contact with
the output signal line.
If the wiring is okay, replace the DST1.
Overload Detected at Test Output Check the wiring to see if a ground fault occurred in the output signal
line.
Under Current is Detected using Muting
Lamp Check the wiring to see if an output signal line is broken.
If the wiring is okay, replace the external lamp.
Safety Input Terminal-related Failures
Discrepancy Error at Safety Input Check the following points:
• Make sure the input signal wire is not contacting the positive side of
the power source.
• 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 has not occurred in the connected device.
• Make sure the set value of the discrepancy time is valid.
To recover from these failures, the following conditions are required:
The latch input error time must have passed, and the cause of the error
must have been removed.
The target safety input terminal inputs must turn OFF.
When changing the discrepancy time, reconfiguration is required.
External Connected Device Failure at Safety
Input
Internal Input Failure at Safety Input • Replace the DST1 if the system failure still occurs after turning the
power supply ON again.