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MELSEC-Q
1 OVERVIEW
1.2 Features of QD51 (-R24)
Systems which use the QD51 (-R24) have the features shown below.
(1) Simultaneous execution of up to two BASIC programs (tasks)
Since multitask processing is possible, BASIC programs can be created by
dividing the control tasks to be done by the QD51 (-R24).
The necessary task is started depending on the control level and the system can
be controlled while exchanging data and synchronizing executions between
tasks.
Controls
executed
in the QD51
D
i
v
i
ded
by
c
on
t
r
o
l
t
y
pe
Task 1
Task 2
It is possible to create
3 or more BASIC programs.
However, a maximum of
2 tasks (BASIC programs)
can be run simultaneously.
(2) Data communications with external devices
<Data communications with external devices>
Non-procedural data communications can be carried out with external devices
connected to the RS-232 and RS-422/485 interfaces.
<Data communications with a console or terminal>
The following data communications can be performed with a console or terminal
connected to the RS232 or RS-422/485 interface.
• Data display to a console or terminal
• Data input to a console or terminal
<Printout on a Printer>
Data can be printed out on a printer connected to the RS-232 interface.
QD51 -R24
ERR.
P.RUN
SD
RD
RUN
PROG
SD
RD
CH. 1
CH.1 CH.2
CH. 2
External device
(printer)
Robot, bar code reader,
thermostat, etc.
PC/AT personal computer, etc.
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