Interrupt Pointer (I) - Mitsubishi Electric L02SCPU User's Manual And Reference

5.11

Interrupt Pointer (I)

The interrupt pointer (I) is used as a label at the start of an interrupt program, and can be used in any programs.
The number of points available for the interrupt pointer is 256 (I0 to I255). The following shows interrupt factors for the
applicable interrupt pointers.
Interrupt factor
Interrupt by built-in I/O
Interrupt by an internal timer
Intelligent function module interrupt
*1 Interrupt pointer numbers can be changed in the PLC Parameter dialog box.
*2 They can be used for interruptions by built-in I/O by configuring parameter in the "PLC Parameter" dialog box.
To use the intelligent function module interrupt, set values in the "Interrupt Pointer Setting" dialog box opened from the "PLC
System" tab of the PLC Parameter dialog box. ( Page 354, Appendix 1.2 (2))
The list of interrupt pointer numbers and interrupt factors are shown below.
I No. Interrupt factor
I0
I1
I2
I3
I4
I5
I6
I7
Interrupt by built-in I/O
I8
I9
I10
I11
I12
I13
I14
I15
*1 The time-limit value of the internal timer is set by default. In the PLC System tab of the PLC Parameter dialog box, the
value can be changed within the range of 2ms to 1000ms in increments of 1ms.
*2 When an interrupt occurs, even if no interrupt pointer exists on the program, "CAN'T EXECUTE(I)" (error code: 4220)
does not occur.
*3 Among I50 to I255, I50 has the highest priority (priority 21), and I255 has the lowest priority (priority 226).
Interrupt pointer (interrupt program label)
Interrupt pointer
I0 to I15
I28 to I31
I50 to I255
Priority
1st point 5
2nd point 6
3rd point 7
4th point 8
5th point 9
6th point 10
7th point 11
8th point 12
9th point 13
10th point 14
11th point 15
12th point 16
13th point 17
14th point 18
15th point 19
16th point 20
Interrupt program
No.
*1
Interrupt from a built-in I/O
Interrupt at fixed intervals by an internal timer of the CPU
module
*2
Interrupt from the intelligent function module
I No. Interrupt factor
I16 to I27 
I28
I29
Interrupt by internal
*1*2
timer
I30
I31

I32 to I49
Intelligent function
I50 to I255
module interrupt
CHAPTER 5 DEVICES
Description
Priority
Empty 
100ms 4
40ms 3
20ms 2
10ms 1

Empty
*3
Empty
21 to 226
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