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3 SPECIFICATIONS
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(3) Task Start Signal (Y19)
(a)
This is a signal that starts the task designated by the start task No.
designation signal (Y11/Y12). The task start signal (Y19) cannot be used as
a general output even in cases where there is no task that is started by an
interrupt from the sequencer CPU. Also, if the task is compiled BASIC, it
cannot be started by an interrupt from the programmable controller CPU.
(b)
The task start signal (Y19) is enabled only while the multitask execution
start signal (X0B) is ON.
(c)
The designated task
(OFF
ON). (Even if the start task No. designation signal (Y11/Y12) goes
ON while the task start signal (Y19) is ON, it is disregarded.)
Example
The example shows a program in the case where task 1 is started from the programmable controller
CPU.
[Conditions]
"IT (started by an interrupt from the programmable controller CPU)" is set with only task 1 set for
multitasking.
Task start signal
Task 1 start signal
General output
treatment
1)
1 Since it is treated as a general output, starting of the task is not carried out.
2)
2 Since the task start signal is not changing from OFF
[Sequence Program]
Task 1 setting designation
Task start command
(d)
In the case of the task designated by the start task No. designation signal
(Y11/Y12) being in the process of starting, task start is disregarded.
(Operation of the currently executing task is continued.)
(e)
If the exclusive command YCHECK is used, the task's starting time can be
shortened. Refer to Chapter 6 concerning the YCHECK command.
1 is started when the task start signal (Y19) rises
ON
Y19 OFF
ON
Y11 OFF
ON
1
OFF
Y12
Task 1 starts
Task 1 executed
MELSEC-Q
ON
2
END
ON, starting of task 1 is not carried out.
Y11
Y19
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