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Chapter 5 Programming Concepts
XBC E-Type Main Unit
5-15
Ver. 1
Process per time
Time (
㎳
)
Process
0
Scan started and scan program started to execute.
0~6
Scan program is executed.
6~8
Scan program is stopped because execution external I/O (P000) is requested. And
program 3 is executed. Request of execution at 7[ms] is ignored because program 3 has
been executing.
8~10
Program 3 is finished and Scan program is continued.
10~12
Scan program is stop by the request of ‘10
㎳
_Cycle time’ interrupt signal and execute program
1.
12~20
Program 1 is finished and Scan program is continued.
20
Request of ‘Cycle time’ interrupt signal and ‘External I/O (P000)’ signal occurs concurrently
but priority of ‘External I/O’ signal is higher than ‘Cycle time’ interrupt signal so program 3
is executed and program 1 is standby.
20~22
Program 3 is finished and Scan program continues.
22~24
After program 3 is completed, program 1 (the program of ‘10ms_Cycle time’ is executed.
24~25
P1 execution completed and the stop scan program execution finished
25
At the finished point of scan program, check the request of Internal device ‘M000’ execution
and execute program 2.
25~30
Program P2 is executed.
30~32
When ‘10
㎳
_Cycle time’ interrupt signal occurs, its priority is higher than the Internal device
‘M000’ though program 2 is stopped and program 1 is executed.
32~34
P1 execution completed and the stopped P2 execution finished
34
New scan starts (Start scan program execution)
Scan program
Program 1
10ms_Cycle time
Program 2
Internal device_M000
Program 3
External I/O_P000
Time
0
6 7 8 10 12
20 22 24 25
30 32 34
Scan started
(Initial operation started)
Scan program stopped New scan started
Summary of Contents for XBC-DN10E
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