
3.STAND-ALONE TYPE 16i/18i/21i-A MAINTENANCE B-62714EN/04
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3.2 LED INDICATIONS AND THEIR MEANINGS
On the I/O Link-II board, four green LEDs (RUN, COM, SO, and
SLV) and two red LEDs (TER and PRT) are provided for status
indication. The locations and display information of the LEDs are
described below.
In the description below, each LED has one of the following states:
A : Turned off B : Turned on C : Blinking D : Irrelevant
NOTE
The face plate is indicated using dotted lines.
LEDs for state indication
No. LED indication Board state
1 1(RUN) B Turned on when the board starts normally.
2 2(COM) B
Turned on when communication starts.
Master station: Turned on when a response is
made to an initialization service request.
Slave station: Turned on when a response is
made to an initialization service request.
3 3(SO) B Turned on each time transmission is performed.
4 4(SLV) B Turned on for a slave station.
LEDs for error occurrence indication
No. LED indication Board state
1 A(TER) B
A communication error was detected in data
reception.
2 B(PRT) B A parity error occurred in main memory.
4(SLV)(GREEN)
3(SO )(GREEN)
2(COM)(GREEN)
1(RUN)(GREEN)
B(PRT)(RED)
A(TER)(RED)