3-5
3 Configuration Units
NJ-series CPU Unit Hardware User’s Manual (W500)
3-1 CPU Units
3
3-1-2 Components and Functions
You can check the CPU Unit status with the indicators at the top of the front panel of the CPU Unit.
The following table describes these indicators.
CPU Unit Operation Status Indicators
Indicator Color Status Meaning
RUN Green Lit The CPU Unit is in normal operation in RUN mode. (The user
program is in execution.)
Flashing (3-s
intervals)
An Incorrect Power Supply Unit Connected error occurred. (A CJ-
series Power Supply Unit is connected in the CPU Rack.) The
CPU Unit will not operate and the ERROR indicator will light.
Flashing (1-s
intervals)
The CPU Unit is starting (entering RUN mode or PROGRAM
mode at startup).
Not lit Operation is stopped in PROGRAM mode, when a CPU Unit
reset is in progress, or when any of the following errors occurs.
• Controller error in the major fault level
• CPU error (WDT error)
ERROR Red Lit Self-diagnosis found one of the following errors.
• Controller error in the major fault level
• CPU error (WDT error)
The CPU Unit operation will stop, and all outputs will turn OFF.
Flashing (1-s
intervals)
Self-diagnosis found one of the following errors.
• Controller error in the partial fault level (an error in which all
control of a Function Module is disabled)
• Controller error in the minor fault level (an error in which partial
control of a Function Module is disabled)
CPU Unit operation will continue for either of these errors.
Operation will stop for the Function Module in which a Controller
error in the partial fault level occurred.
Operation will continue for the Function Module in which a Con-
troller error in the minor fault level occurred.
Not lit The CPU Unit is in normal operation, a CPU reset is in progress,
or monitored information occurred. (CPU Unit operation will con-
tinue.)
BUSY Yellow Flashing Built-in non-volatile memory access in progress.
Not lit Other than the above.
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