User`s manual

105
CHAPTER 4 FUNCTION
4
4.2 Counter Format Selection 4.2.2 Ring counter function
(a) When the ring counter lower limit value the present value  the ring counter upper
limit value (common use)
• When counting up
When the present value reaches the ring counter upper limit value, the ring counter lower limit value is
automatically stored in CH1 Present value (Un\G1050, Un\G1051).
• When counting down
When the present value reaches the ring counter lower limit value, the ring counter lower limit value is held
as the present value. The value (ring counter upper limit value - 1) is stored in CH1 Present value
(Un\G1050, Un\G1051) at the next count-down pulse input.
Both when counting up and down, the ring counter upper limit value is not stored in CH1 Present value
(Un\G1050, Un\G1051). (Except for the case that the present value equals to the ring counter upper limit value
at the rising state (off to on) of CH1 Count enable command (Y06), or when the preset/replace function is
performed.)
For example, if CH1 Count enable command (Y06) is turned on when the ring counter lower limit value is 0, the
ring counter upper limit value is 2000, and the present value is 500, the counting range and the present value
change as follows.
-2147483648
0
500
2000
2147483647
(2000)
500 501 1998 1999to 0 1 2 to 498 499
The ring counter upper limit value,
2000, is not stored in CH1 Present
value (Un\G1050, Un\G1051).
Ring counter lower limit
Present value
Ring counter upper limit
Ring counter
lower limit
Present value
Counting range
Ring counter
upper limit