2. Programming Concepts
Accumulative Timer
The timer executes once when the program reaches END instruction. When TMR instruction is
executed, the timer coil will be ON when the current value reaches its preset value. For
accumulative timers, current value will not be cleared when timing is interrupted.
Timer T250 will be driven when X0 = ON. When X0 = OFFor the power is off, timer T250 will pause
and retain the current value. When X0 is ON again, T250 resumes timing from where it was paused.
T250
Y0
X0
TMR
T250 K100
X0
T2
Y0
K100
T1+T2=10sec
T250
T1
present
value
Timers for Subroutines and Interrupts
Timers for subroutines and interrupts count once when END instruction is met. The associated
output coils will be ON if the set value is achieved when End instruction executes. T184~T199 are
the only timers that can be used in subroutines or interrupts. Generals timers used in subroutines
and interrupts will not work if the subroutines or interrupts are not executing.
2.11 C (Counter)
Counters will increment their present count value when input signals are triggered from OFFON.
16 bits
32 bits counters
counters
Type General General High speed
Counters C0~C199 C200~C231(C232)
C232(C233)~C242,
C243, C244
C245~C254
Count
direction
Count up Count up/down Count up
Range 0~32,767 -2,147,483,648~+2,147,483,647 0~2,147,483,647
Preset
value
register
Constant K or
data register
D (Word)
Constant K or data register D (Dword)
Counter will keep on
counting when preset
value is reached. The
count value will
become 0 if one more
count is added to
+2,147,483,647
Counter will
stop when
preset value
reached
Counter will keep on counting when preset
value reached. The count value will become
Output
operation
-2,147,483,648 if one more count is added
to +2,147,483,647
2-31
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