Mitsubishi NZ2GFCF-D62PD2 User Manual page 102

(b) "Present value < Ring counter lower limit value" or "Ring counter upper limit value <
Present value"
• For counting up
When the value in CH Present value (RWr10 to RWr11, RWr28 to RWr29) reaches CH Ring counter
lower limit value (RWw10 to RWw11, RWw28 to RWw29), the value in CH Ring counter lower limit value
(RWw10 to RWw11, RWw28 to RWw29) is held as the present value. The value "ring counter upper limit
value + 1" is stored in CH Present value (RWr10 to RWr11, RWr28 to RWr29) at the next count-up pulse
input.
• For counting down
When the value in CH Present value (RWr10 to RWr11, RWr28 to RWr29) reaches CH Ring counter
upper limit value (RWw12 to RWw13, RWw2A to RWw2B), the value in CH Ring counter lower limit
value (RWw10 to RWw11, RWw28 to RWw29) is automatically stored in CH Present value (RWr10 to
RWr11, RWr28 to RWr29).
Both for counting up and down, the value in CH Ring counter upper limit value (RWw12 to RWw13, RWw2A
to RWw2B) is not stored in CH Present value (RWr10 to RWr11, RWr28 to RWr29).
For example, if CH Count enable command (RY24, RY3C) is turned on when CH Ring counter lower limit
value (RWw10 to RWw11, RWw28 to RWw29) is 0, CH Ring counter upper limit value (RWw12 to RWw13,
RWw2A to RWw2B) is 2000, and CH Present value (RWr10 to RWr11, RWr28 to RWr29) is 3000, the
counting range and the CH Present value (RWr10 to RWr11, RWr28 to RWr29) change as follows.
-2147483648
CH Present value
(RWr10 to RWr11,
RWr28 to RWr29)
3000
In counting
up
CH Present value
(RWr10 to RWr11,
RWr28 to RWr29)
3000
In counting
down
(c) Ring counter lower limit value = Ring counter upper limit value
When the ring counter lower limit value equals to the ring counter upper limit value, the counting range is from
-2147483648 to 2147483647 regardless of CH Present value (RWr10 to RWr11, RWr28 to RWr29).
100
CH Ring counter lower limit value
(RWw10 to RWw11, RWw28 to RWw29)
0
Counting range
CH
upper limit value
(RWw12 to RWw13,
RWw2A to RWw2B)
3001 to 2147483647 -2147483648 to
CH Ring counter
upper limit value
(RWw12 to RWw13,
RWw2A to RWw2B)
(2000)
2999 to 2001 0 -1
The value of CH
value (RWw12 to RWw13, RWw2A to RWw2B),
2000, is not stored in CH
(RWr10 to RWr11, RWr28 to RWr29).
CH Ring counter upper limit value
(RWw12 to RWw13, RWw2A to RWw2B)
CH Present value
2000
(RWr10 to RWr11, RWr28 to RWr29)
3000
Counting range
Ring counter
CH
lower limit value
(RWw10 to RWw11,
RWw28 to RWw29)
(2000)
-2 -1 0 2001
The value of CH
value (RWw12 to RWw13, RWw2A to RWw2B),
2000, is not stored in CH
(RWr10 to RWr11, RWr28 to RWr29).
CH Ring counter
lower limit value
(RWw10 to RWw11,
RWw28 to RWw29)
2147483647
-2 to -2147483648 2147483646
Ring counter upper limit
Present value
2147483647
Ring counter
2002 to 2998 2999
Ring counter upper limit
Present value
3002 3001