IDEC MicroSmart - Manual (Page 322)

18: P ROGRAM B RANCHING I NSTRUCTIONS
18-8 « FC4A M ICRO S MART U SER ’ S M ANUAL »
Example: DI and EI
The following example demonstrates a program to disable and enable interrupt inputs and timer interrupt selectively. For
the interrupt input and timer interrupt functions, see pages 5-20 and 5-22. In this example, inputs I2 and I3 are designated
as interrupt inputs and timer interrupt is used with interrupt intervals of 100 ms.
M8120 is the initialize pulse special internal relay.
D8032 stores jump destination label number 0 for interrupt input I2.
D8033 stores jump destination label number 1 for interrupt input I3.
D8036 stores jump destination label number 2 for timer interrupt.
When input I10 is on, DI disables interrupt inputs I2, I3, and timer inter-
rupt, then M8140, M8141, and M8144 turn off.
When input I11 is on and I10 is off, EI enables interrupt inputs I2 and I3,
then M8140 and M8141 turn on.
When input I12 is on and I10 is off, EI enables timer interrupt, then
M8144 turns on.
End of the main program.
When input I2 is on, program execution jumps to label 0.
M8125 is the in-operation output special internal relay.
ALT turns on or off the output Q2 internal memor y.
IOREF immediately writes the output Q2 internal memor y status to actual
output Q2.
Program execution returns to the main program.
When input I3 is on, program execution jumps to label 1.
M8125 is the in-operation output special internal relay.
ALT turns on or off the output Q3 internal memor y.
IOREF immediately writes the output Q3 internal memor y status to actual
output Q3.
Program execution returns to the main program.
Timer interrupt occurs ever y 100 ms, then program execution jumps to
label 2.
M8125 is the in-operation output special internal relay.
ALT turns on or off the output Q4 internal memor y.
IOREF immediately writes the output Q4 internal memor y status to actual
output Q4.
Program execution returns to the main program.
M8120
END
I10
REP S1 –
0
D1 –
D8032
MOV(W)
DI S1
19
LABEL
0
REP S1 –
1
D1 –
D8033
MOV(W)
REP S1 –
2
D1 –
D8036
MOV(W)
I10
EI S1
3
EI S1
16
I11
I12 I10
M8125
ALT D1
Q2
M8125
IOREF S1
Q2
LRET
LABEL
1
M8125
ALT D1
Q3
M8125
IOREF S1
Q3
LRET
LABEL
2
M8125
ALT D1
Q4
M8125
IOREF S1
Q4
LRET