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3. INTERRUPT PROCESSING
MELSEC-A
3.
INTERRUPT PROCESSING
3.1
Designating an lnterrupt Program (10 to 115)
The A1 S161 can execute 16 interrupt programs (10 to 1 1
5)
which correspond
to interrupt requests 0 to F.
When an interrupt signal is input to terminal number 0 and a slide switch is
set to RISE, the program jumps to interrupt pointer 10, and an interrupt
program is executed.
The interrupt pointer numbers (I) which correspond to A1S161 terminal num-
bers is given below.
A1 S161 terminal numbers
Interrupt pointers (program)
POINT
The interrupt program that corresponds to an interrupt factor includes
interrupt pointers 116 to 123 (spec~al-function module interrupt) and 129 to
131 (time interrupt).
The priority of these pointers is as follows.
116to 123- 10to115+ 113to129
+
Higher priority
3.2
lnterrupt Signal Pulse Width
The response t ~ m e of an A1S161 is
0.2
msec from OFF to ON.
Therefore, the pulse width of an interrupt signal is 0.2 msec or more.
If the pulse width is less than 0.2 msec, an interrupt may not be received.
lnterrupt input (external switch)
0.2 msec or more
lnterrupt detect~on and pre-processing
lnterrupt program
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