LSIS XBE-DC08A, Руководство пользователя, Страница: 107 / 1284

M
ain
Chapter 1 Configuration and Operation Mode of Programs
1-10
(5)Example of program configuration and processing
The example of the program execution sequence is given under the registered tasks and programs as below.
• Registered task programs
Interrupt source Interrupt Name Priority Task No. Program Name running time
Fixed cycle 10
㎳
_fixed cycle 3 0 Program1 2ms
Internal contact Internalcontact_M00 5 24 Program2 7ms
External contact Externalcontact_P08 2 16 Program3 2ms
- - - - Scan program 17ms
Time (
㎳
) Executed details
0~6 The scan program starts and is executed.
6~8
Request on running the external contact interrupt is entered and the scan program is interrupted and
the program 3 runs. There is the request on rerun at 7[
㎳
] but it is ignored since the program is running.
8~10 The execution of the program 3 is completed and the scan program will run continuously.
10~12
There is the request on running 10
㎳
_fixed cycle interrupt so the scan program is interrupted and the
program 1 runs.
12~20
The execution of the program 1 is completed and the scan program that was interrupted runs
continuously.
20
Although there are the requests on 10
㎳
_fixed cycle interrupt and the external contact interrupt at the
same time, the external contact interrupt has higher priority so the program 3 runs and the program 1
stands by for execution.
20~22 The scan program is interrupted and the program 3 runs.
22~24
The execution of the program 3 is completed and the pending 10
㎳
_fixed cycle interrupt program 1
runs.
24~25 The execution of the program 1 is completed and the scan program is finished.
25
The program 2 is executed by checking the interrupt request on internal contact_M0 of P2 at the time
of completion of the scan program.
Execution of Scan
program
Execution of program 1
Occurrence of
10ms_fixed cycle
Execution of program 2
Occurrence of Internal
contact %M000
Execution of program 3
Occurrence of external
contact %Q000
Time
0
6 7 8 10 12 20 22 24 25 30 32 34
Scan startup
(Initial operation
t )
End of Scan program
New scan startup