YASKAWA SGD7C-***AMAA*** Product Manual page 628

12.8 Counter Function Module
12.8.1 What Is the Counter Function Module?
Pulse Counting
Pulse counting is used to read the pulse A/B input signals and increment (forward) or decre-
ment (reverse) the count.
A time graph that illustrates pulse counting for different operating modes is provided below.
The above graph is described in the following table.
Current count
Count preset 1
Maximum overflow
Minimum overflow
Count preset 2
12-54
2,147,48 ,647 (max.)
(+)
Count pre et 1
0
n1
(-)
-2,147,48 ,648 (min.)
Time ( )
T
n1
Current count
Count pre et data
T = can time ( )
Item
The values n1 to n7 (count for each scan) are given in sequence in IL04
(Current Count).
The count is preset at position p1. Therefore, the count is forced to the preset
value (p2).
When the count reaches the maximum value (p3), it is automatically reset to the
minimum value (p4).
When the count reaches the minimum value (p5), it is automatically reset to the
maximum value (p6).
The count is preset at position p7. Therefore, the count is forced to the preset
value (p8).
p
p2
n
n2
p1
Counting prohibition
relea ed.
Counting prohibited.
n4
p4
n2 n
p2
Description
p6
p7
Count pre et 2
p8
n6
Counting
prohibited.
Counting prohibition
n5
relea ed.
p5
n4 n5 n6
p8
n7
n7