Chapter 5 Programming Concepts
XBC E-Type Main Unit
5-9
Ver. 1
3. Task type
Task type and function is as follows.
Type
Spec.
Cycle time task
(Interval task)
I/O task
(Interrupt task)
Internal device task
(Single task)
“
E
”
type
Max. Task
number
8
4
8
Start condition
Cyclic
(setting up to max.
4,294,967.295 sec. by
1ms unit)
Rising or falling edge of main unit’s
contact P000 ~P003
Internal device
execution condition
Detection and
execution
Cyclic execution per
setting time
Immediate execution at the edge of
main unit’s contact
Retrieve the condition
and execute after
completing Scan
Program
Detection delay
time
Max. 1 ms delay
Max. 0.05 ms delay
Delay as much as max.
scan time
Execution
priority
2~7 level setting
(2 level is highest in
priority)
2~7 level setting
(2 level is highest in priority)
2~7 level setting
(2 level is highest in
priority)
Task no.
Within 0~7 range
without user
duplication
With 8~15 range without user
duplication
Within 16~23 range
without user duplication
4. Processing methods of task program
Below describes the common processing method and notices for Task program.
a. Feature of task program
i. Task Program is executed only when the execution condition occurs without
every scan repeat processing. When preparing Task Program, please consider
this.
b. Execution priority
i. In the event several tasks to be executed are waiting, execute from the highest
Task Program in priority. When the same priority tasks are waiting, execute
consecutively.
ii. In the event Cycle time task and external I/O task is occurred concurrently,
execute from the highest task program. (In sequence of XG5000 setting)
iii. The task program priority should be set considering the program requirements,
importance and the emergency when the execution requested.
Summary of Contents for XBC-DN10E
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