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6 BASIC INSTRUCTIONS
IMASK
(1) Enables/disables the execution of the interrupt program marked by the designated interrupt
pointer by using the bit pattern of 8 points from the device designated by
• 1 (ON) ......Interrupt program execution enabled
• 0 (OFF).....Interrupt program execution disabled
(2) The interrupt pointer numbers corresponding to the individual bits are as shown below:
(3) When the power is turned ON or when the CPU module has been reset with the execution of
interrupt programs I0 to I31 is enabled.
(4) The statuses of devices
and SD781 to SD785 (storage area for IMASK instruction mask pattern).
(5) Although the special registers are separated as SD715 to SD717 and SD781 to SD785, device
numbers should be designated as
POINTS
(1) An interrupt pointer occupies 1 step.
(2) Refer to the Basic model QCPU (Q mode) User's Manual (Function Explanation, Program
Fundamentals) for information on interrupt conditions.
(3) The DI state (interrupt disabled) is active during the execution of an interrupt program.
Do not insert EI instructions in interrupt programs to attempt the execution of multiple
interrupts, with interrupt programs running inside interrupt programs.
(4) If there are EI and DI instructions within a master control, these instructions will be
executed regardless of the execution/non-execution status of the MC instruction.
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b15
b14 b13 b12 b11 b10 b9
S
I15 I14
I13 I12 I11 I10
+ 1
S
I31 I30 I29 I28 I27 I26 I25 I24 I23 I22 I21 I20 I19 I18 I17 I16
+ 2
S
I47 I46 I45 I44 I43 I42 I41 I40 I39 I38 I37 I36 I35 I34 I33 I32
+ 3
S
I63 I62 I61 I60 I59 I58 I57 I56 I55 I54 I53 I52 I51 I50 I49 I48
+ 4
S
I79 I78 I77 I76 I75 I74 I73 I72 I71 I70 I69
+ 5
S
I95 I94 I93 I92 I91 I90 I89 I88 I87 I86 I85 I84 I83 I82 I81 I80
+ 6
S
I111 I110 I109 I108 I107 I106 I105 I104 I103 I102 I101 I100 I99 I98 I97 I96
+ 7
S
I127 I126 I125 I124 I123 I122 I121 I120 I119 I118 I117 I116 I115 I114 I113 I112
,
+1,
S
S
S
I10
50
Stored at step 50
53
55
b8
b7
b6
b5
b4
b3
b2
I9
I8
I7
I6
I5
I4
I3
I2
I68 I67 I66 I65 I64
+2, and
+3 to
+7 are stored in SD715 to SD717
S
S
to
+7 successively.
S
S
X1C
X5
MELSEC-Q/QnA
.
S
b1
b0
I1
I0
Y10
Y30
IRET
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