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(2) Count range of the ring counter
The count range is determined by the relationship between CH Present value (Un\G2, Un\G3, Un\G34,
Un\G35) and the ring counter lower limit/upper limit values when CH Count enable command (Y4, YC) is turned
on or when the preset function is performed.
Normally, the count range is "Ring counter lower limit value Present value Ring counter upper limit value".
(a) When the count range is Ring counter lower limit value Present value Ring
counter upper limit value (normally used)
• For up count
When the present value reaches the ring counter upper limit value, the ring counter lower limit value is
automatically stored in CH Present value (Un\G2, Un\G3, Un\G34, Un\G35).
• For down count
Even when the present value reaches the ring counter lower limit value, the ring counter lower limit value
is held as the lower limit, and "Ring counter upper limit value - 1" is stored in CH Present value (Un\G2,
Un\G3, Un\G34, Un\G35) at the next count-down pulse input.
Both in up count and in down count, the ring counter upper limit value is not stored in CH Present value
(Un\G2, Un\G3, Un\G34, Un\G35).
For example, when the count enable command is valid while the ring counter lower limit value is 0, the ring
counter upper limit value is 2000, and the present value is 500, the count range and the present value will
change as follows.
-2147483648
Ring counter
lower limit value
Present value
Ring counter
upper limit value
0
500
2000
2147483647
Ring counter
lower limit value
(2000)
Present value
500 501 1998 1999to 0 1 2 to 498 499
Counting range
Ring counter
upper limit value
The ring counter upper limit value,
2000, is not stored in CH Present
value (Un\G2, Un\G3, Un\G34,
Un\G35).