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3. SPECIFICATIONS
MELSEC-A
Example 1: Use of input signals Xn4 to Xn6
Request from computer
1 1 1
Station
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Computer
number
Message wait time
(Value;
Example 2: Use of Xn8, Y(n+1)8, and Y(n+l)C when printer function
i s
used.
ON
Xn8
OFF
I Q 1 I H
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h
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ACK or
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N AK
1 4
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Request
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to PC
Error code
(address 801 H)
O O H
O O H
O O H
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Reply
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from PC
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Printer output
Output
Stop
Output
/
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/ \ I \
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Operation contents
(1)
W h e n
Y[.+t)8 is turned ON, the message output to the printer is started.
(2) When
Y
is turned OFF, the message output to the printer is forcibly completed. At this time, an
error(08h) occurs.
(3) O O H Is written to buffer address 801 Hand an error is reset.
(4) When Y@+?)8 is turned ON, the message output to the printer is started.
(5) When Y[.+$
is turned ON, the message output to the printer is interrupted. At this time, an error(07H)
occurs.
(6) When Yinr?) is tumed OFF, the interrupted messages are output to the printer. At this time, an error Is
automatically reset to WH.
(7) When the message output is completed, Xn8 is turned ON.
(8) Y(,+1)8 is tumed OFF by a sequence program.
(9) When Yp+q 8 is turned OFF, X [ W ? ) ~ is turned OFF.
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-1+2+3-4-5+1-
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