Mitsubishi Electric MELCEC Q Series User Manual page 69

4. CPU MODULE
The interrupt counters in C224 to C255 are allocated to the interrupt pointers I0 to I31 as
shown below, and count the occurrences of interrupts by those of I0 to I31.
Interrupt
pointer
Interrupt Interrupt
counter pointer
I0 C224 I8
I1 C225 I9
I2 C226 I10
I3 C227 I11
I4 C228 I12
I5 C229 I13
I6 C230 I14
I7 C231 I15
(d) The counter-use points can be set arbitrarily by 16 points using the serial
numbers.
By setting the counter which points to the number actually used, the counter
processing time subsequent to the END instruction can be shortened.
(e) The counter set values are as follows:
C0 to C255 :constant or word device (D)
C256 to C1023
(Allocate a storage device for the set value by setting
parameters.)
POINT
When the timer-use points are set to 257 points or more or the counter-use points
are set to 257 points or more, the set value storage devices (D, W, R) specified at
the time of timer/counter use point setup are automatically set in the serial
numbers.
<Example>
When the timer-use points are set to 512 points and the set value storage device
is set to D1000, D equivalent to 256 points (D1000 to D1255) in T256 to T511
becomes the devices for the set values using the continuous numbers.
Interrupt Interrupt
counter pointer
C232 I16
C233 I17
C234 I18
C235 I19
C236 I20
C237 I21
C238 I22
C239 I23
:word device (D, W, R)
4 - 23
Interrupt Interrupt Interrupt
counter pointer counter
C240 I24
C241 I25
C244 I26
C243 I27
C244 I28
C245 I29
C246 I30
C247 I31
C248
C249
C250
C251
C252
C253
C254
C255