LG Electronics 120S user manual Parameter Setting

Chapter 7 Usage of Various Functions

8)Parameter Setting

(1)Format setting

(a)Linear counter

•If HSC is designate as Linear counter, it can counts from -2,147,483,648 to 2,147,483,647.

•The carry flag F18*(* is channel number) turns on when the current value of high speed counter is overflow during up counting and HSC stop counting.

•The borrow flag F19*(* is channel number) turns on when the current value of high speed counter is underflow during down counting and HSC stop counting.

•Carry and borrow flags can be reset by preset operation and HSC can re-starts its operation.

2,147,483,647	Carry occurs
Current value
Decreasing	0	Increasing
Borrow occurs	-2,147,483,648

(b)Ring counter

•If HSC is designate as Ring counter, it can counts from 0 to set value.

•The carry flag turns on when the current value of high speed counter reaches set value during up counting and current value is changed to 0.

•The borrow flag turns on when the current value of high speed counter is reaches 0 during down counting and current value is changed to ‘set value –1’.

•When set value is out of range(2 ~ 2,147,483,647), Ring counter setting error(h’11) occurs and HSC operates as linear counter.

•When current value is changed to out of range(2 ~ 2,147,483,647) by preset operation, Ring counter setting error(h’11) occurs and HSC operates as linear counter.

•The ring counter setting error can be corrected by re-start of instruction(HSCST) only.

		Carry occurs
Current value
Decreasing	Borrow occurs	0
		Increasing
		7-6