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4 ABOUT QD51 (-R24) FUNCTIONS
4.5.1 ON/OFF data communications by general output (X/Y)
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Using the QD51 (-R24)'s general purpose input / output, ON/OFF data can be
communicated between the QD51 (-R24) and the programmable controller CPU.
Programmable controller CPU
Internal Memory
Sequence Program
Yn
ON/OFF
Reading of
Xn
ON/OFF
data
(1) In the case of programmable controller CPU
Sending of ON/OFF data from the programmable controller CPU to the QD51 (-
R24) is carried out by general output (Y).
The QD51 (-R24) uses the special variable B@ in a BASIC program to read the
general output turned ON/OFF by the programmable controller CPU.
(2) In the case of QD51 (-R24)
Sending of ON/OFF data from the QD51 (-R24) to the programmable controller
CPU is carried out by general input (X).
The programmable controller CPU uses a sequence program to read the general
input turned ON/OFF by a QD51 (-R24) BASIC program.
[Special variables used]
The special variables used to read ON/OFF data from general input (X) and general
output (Y) are shown below.
Special Variable
B@ (X, Formula)
B@ (Y, Formula)
Output
ON/OFF data
(Y)
area
Input
ON/OFF data
(X)
area
Programmable controller CPU
Processing Contents
:
Turns the QD51 (-R24)'s general input (X) ON and OFF.
:
Reads ON/OFF data from the QD51 (-R24)'s general output (Y).
MELSEC-Q
QD51(-R24)
Reading of
ON/OFF
General
data
output
(Y)
BASIC
program
General
ON/OFF
output
(X)
QD51 (-R24)
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