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4.A2CCPU
MELSEC·A
No.
Name
Function
(3)
RUN LED
A2.C run status indicator LED
I
• ON:
A sequence program operation is being executed with the RUN key switch set
in the RUN position.
The LEO remains lit
if
an error, which permits sequence operation to continue,
occurs.
• OFF:
The RUN LED goes out in the following cases.
• '00/200 VAC is nolsupplied 10 the A2C.
• The RUN key switch is in the STOP position.
• The remote STOP signal is input. See Section 4.2.3.
• The remote PAUSE signal is input.
See Section 4.2.4.
• Flicker:
The RUN LED flickers in the following cases.
• An error which causes sequence operation to stop is detected by the self-diag-
nosis function.
• The latch clear operation is executed. See Section 4.2.2.
(4)
ERROR LED
The self-diagnosis error detection status indicator LED
I
• ON:
An error is detected by the self-diagnosis function.
The LED remains off when an error for which the indicator LED should remain
OFF by the LED indication priority setting is detected.
• OFF:
The A2C is running correctly.
• Flicker:
The annunciator (F) is set ON by the sequence program.
(5)
SO LED
The data transmission state indicator LED (transmission to I/O modules and
remote terminal modules)
• ON:
The A2C
is transmitting data to an 1/0 module or remote terminal module
correctly.
• OFF:
The SO LED goes out in the follOWing cases.
• Data is not being transmitted an I/O module or remote terminal module.
• There is an error in the Initial data or the initial program error.
• The A2C hardware is faulty.
4-78
I

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