Omron CJ2 CPU UNIT - Operation When TEST Switch Is Pressed; Self-Diagnostic Function

7 Inspection and Maintenance
7-14
CJ2 CPU Unit Hardware User’s Manual
z 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.
• Operation when TEST switch is pressed for less than 3 seconds.
Precautions for Correct UsePrecautions 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.
z Self-diagnostic Function
*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.
Error name Display
Alarm out-
put status
Error details (cause) Recovery method
Unit overheated
error
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.
*1
Remove the cause of the over-
heating error.
Unit error OFF System error from external noise or
hardware malfunction.
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.
ON
ON
TEST switch
Alarm output
0.5 s
0.5 s 0.5 s
0.5 s
0.5 s 0.5 s
ON
ON OFF ON
0.5 s 0.5 s 0.5 s 0.5 s 0.5 s 0.5 s
TEST switch
Alarm output
3 s