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4.
SElTlNGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
(1)
LEDs 2-C/N to 4-510 (LED Nos.16 to 23) above light when an error
occurs.
The ON/OFF status of the LED Nos. 16 to 23 are stored in the buffer
memory at address 101H. The status can be read using the PC CPU
instruction which permits checking by a sequence program.
Mode Setting
Main Channel Setting
(2) After any LED 2-CIN to 4-510 (LED Nos. 16 to 23) is ON, they remain ON
even when the cause of the error is eliminated.
I
to
4
RS-232C
RS-422
ON
OFF
LED No.
4
7
It is necessary to send a turn-off request to address 102H of the buffer
memory using the sequence program TO instruction to turn OFF the LED.
LED
2-NEU
4-NEU
(3) LEDs RUN to 4-RD (LED Nos. 0 to 11) and CPU R/W (LED No.25) above
light corresponding to the relevant status.
5 to
8
RS-232C
RS-422
OFF
ON
(4)
LEDs 2-C/N and 4-C/N (LED Nos. 16 and 20) above light in the following
circumstances:
(a) When the AJ71C24 attempts to make an illegal access while the PC
CPU is running (a write during program execution, for example).
(b) During abnormal PC CPU access.
9
RS-232C
RS-422
OFF
OFF
( 5 )
The "initial state" column indicates the status when the power is turned
ON or the PC CPU is reset.
F
RS232C
RS-422
OFF
OFF
A ~ O
D
RS-232C
ON
OFF
- -
RS-422
OFF
ON
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