LSIS XBC-DN20SU - Page 75

Chapter 5 Program Configuration and Operation Method
5- 24
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 stop 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 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 is occurred
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 is continued.
22~24
After program 3 is completed, program 1 (the program of „10ms_Cycle time‟ is executed.
24~25
P1 execution completed and the stopped 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 is occurred, the priority of that is higher than Internal
device „M000‟ though program 2 is stopped and program 1 is executed.
32~34
P1 executed 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
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