Delta DVP-ES2 - Manual (Page 244)

D V P - E S 2 / E X 2 / S S 2 / S A2 / S X 2 / S E O p e r a t i o n M a n u a l - P r o g r a m m i n g
3 - 1 2 8
M1000
DCNT C251 K100
DHSCS C251 K100 M0
¾ When C251 counts up and the value in C251 varies from 100 to101, DHSCS instruction
sets M0 ON.
¾ When C251 counts down and the value in C251 varies from 100 to 99, DHSCR
instruction resets M0.
¾ Timing diagram for the comparison:
Counting
No.
Time
Count up Count down
M0
101
100
99
98
101
100
99
98
1 2
Program Example 3:
Executes interrupt subroutine by applying software comparator.
M1000
DCNT C235 K100
DHSCS C235 K100 I010
EI
FEND
I010
M1000
OUT Y10
IRET
END
¾ When value in C235 varies from 99 to100, interrupt subroutine triggered by I010 executes
immediately to set Y0 ON.
Points to note:
¾ If operand D is specified as S, M or Y0~Y3 for the above high speed comparison, the compare
result will immediately output to the external points Y0~Y3 (Y0~Y5 for SS2/SX2). However, if
D is specified as Y4~Y337, external outputs will be updated till the end of program (delay for
one scan cycle).