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Programming Device Operations for Tasks Section 4-4
will not be interrupted for execution of interrupt task, i.e., execution of the
instruction will be completed before the interrupt task is executed, delaying
the response of the interrupt. To prevent this, separate data processing for
these instructions into more than one instructions, as shown below for XFER.
4-4 Programming Device Operations for Tasks
4-4-1 Using Multiple Cyclic Tasks
Use the CX-Programmer to create more than one cyclic task (including extra
cyclic tasks). A Programming Console cannot be used to create new cyclic
tasks. Be sure to use a CX-Programmer to allocate the task type and task
number for programs that are created.
• Multiple cyclic tasks created and transferred to a CPU Unit from the CX-
Programmer can be monitored or edited from a Programming Console.
• The Programming Console can be used to create one cyclic task and one
or more specific interrupt tasks simply by using the Programming Con-
sole’s All Clear function and specifying Interrupt Tasks. Only interrupt
tasks 1 (power OFF interrupt), 2 and 3 (scheduled interrupts), and 100
through 131 (I/O interrupts) can be created with a Programming Console.
With a CJ1M CPU Unit, however, interrupt tasks 140 through 143 (for
built-in inputs) can also be created. Cyclic task 0 will start when PLC
operation is started.
4-4-2 Programming Device Operations
CX-Programmer Specify the task type and number as attributes for each program.
1,2,3... 1. Select View/Properties, or click the right button and select Properties on
the popup menu, to display the program that will be allocated a task.
2. Select the General tab, and select the Task Type and Task No. For the
cyclic task, click the check box for Operation start to turn it ON.
XFER
&50
D00050
D30050
XFER
&50
D00000
D30000
XFER
&100
D00000
D30000
Interrupts are possible as
soon as execution of XFER
has been completed.
XFER instruction is
not interrupted.
Processing
separated.
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