Chapter 10 DC Input Option Board
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(2) Counter type
Option board supports linear counter.
(a) Linear counter
1) Linear Count range: -2,147,483,648 ~ 2,147,483,647
2) If count value reaches the maximum value while increased, Carry will occur, and if count value
reaches the minimum value while decreased, Borrow will occur.
3) If Carry occurs, count stops and increasing is not available but decreasing is available.
4) If Borrow occurs, count stops and decreasing is not available but increasing is available.
(3) Carry signal
(a) When Carry signal occurs
1) When count range maximum value of 2,147,483,647 is reached during Linear Count
(b) Count when Carry Signal occurs
1) Count stops if Carry occurs during Linear Count.
(c) Carry reset
1) „Carry reset‟ instruction is not supported at option board. Reset „Carry‟ by using „Preset‟ instruction
after making the counter value within counter range.
(4) Borrow signal
(a) When Count when Borrow signal occurs
1) When count range minimum value of -2,147,483,648 is reached during Linear Count.
(b) Count when Borrow signal occurs
1) Count stops if Borrow occurs during Linear Count.
(c) Borrow reset
1) „Carry reset‟ instruction is not supported at option board. Reset „Carry‟ by using „Preset‟ instruction
after making the counter value within counter range.
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