7.
INITIAL
SETTING
OF
TRANSMISSION CONTROL DATA
TO
BUFFER
MEMORY
,
.
,
.,
,..
7.3.2
Turning
OFF
error
LEDs
When an error LED turns
ON,
it
stays
ON
(lit) even when the cause
of
the
error has been eliminated.
To turn OFF the
lit
LED,
'1'
must be written to the appropriate
bit
of
address
102H
of
the buffer memory, using the sequence program TO instruction.
(1)
Error LED turn-OFF request area
102HL
b15
b14to
b8
b7
b6
b5
M
b3
b2
bl
bO
2-m
(LED
N0.16)
2-PB
(LED
No.17)
2sK)
(LED
No.19)
4cM
(LED
No20)
-
(2)
Program example to turn OFF error LEDs
A
sequence program example to turn OFF LED
2-C/N
(LED
No.16)
and
LED 4-PRO (LED
No.22)
is given below.
TOP
I
I
'b15 b14 to
b8
b7
b6
b5
M
b3
b2
bl
&
POINTS
I
(1)
The LED turn-OFF request is only valid when
it
is written.
(2)
Relevant data
in
the error LED display status storage area at address
101
H
is cleared when the LED turn-OFF request is made. Data at
address
102H
remains as written.
(3)
If
the error data has not been cleared after the LED turn-OFF request
is made, the corresponding
bit
in the error LED display status
storage area turns the error LED
ON
again.
7-a
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