Operation When Test Switch Is Pressed; Self-Diagnostic Function - Omron CJ2 CPU UNIT User Manual

Cj2 cpu unit hardware
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7 Inspection and Maintenance

Operation When TEST Switch Is Pressed

The following operation will be performed when the TEST switch on the replacement notification
function module is pressed. When the switch is pressed for less than 3 seconds, the unit version will
be displayed 3 times at 0.5-second intervals. When the switch is pressed for at least 3 seconds, the
alarm output will momentarily turn OFF, and the alarm display A02 will be shown. The operation will
return to the normal display and output when the switch is released. Use the TEST switch to check
the connection between the replacement notification output and devices.
• Operation when TEST switch is pressed for less than 3 seconds.
TEST switch
Alarm output
• Operation when TEST switch is pressed for less than 3 seconds.
TEST switch
Alarm output
Precautions for Correct Use
Precautions for Correct Use
Under normal application conditions, the replacement notification function will operate after sev-
eral years or even tens of years. When using a Power Supply Unit for an extended period of time,
periodically check operation with the TEST switch as described above and be sure the alarm
output functions properly.

Self-diagnostic Function

Error name
Display
Unit overheated
error
Unit error
*1 If the error continues for 3 hours or longer, the replacement notification function will be disabled. Even if the cause of the
overheating is removed, the display will continue as "Hot," and the notification output will remain OFF. In this state, the
internal parts may deteriorate even if the PLC operation is normal, so replace the Power Supply Unit.
7-14
ON
0.5 s
0.5 s
0.5 s
3 s
ON
0.5 s
0.5 s
0.5 s
ON
Alarm out-
Error details (cause)
put status
OFF
Internal overheating has occurred in
the Power Supply Unit as a result of
usage under conditions that exceed
the specified values, insufficient venti-
lation, or incorrect installation.
OFF
System error from external noise or
hardware malfunction.
0.5 s
0.5 s
0.5 s
ON
0.5 s
0.5 s
0.5 s
*1
CJ2 CPU Unit Hardware User's Manual
OFF
ON
Recovery method
Remove the cause of the over-
heating error.
Turn ON the input's power sup-
ply again. If the Unit does not
recover, the error may be
caused by a Unit malfunction.
Consult with your OMRON rep-
resentative.

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