Omron SYSMAC CJ - REFERENCE MANUAL 08-2008 Reference Manual page 325

Timer and Counter Instructions
Example 1:
Long-term Timers
The following program examples show three ways to create long-term timers
with standard TIM and CNT instructions.
Two TIM Instructions
In this example, two TIM instructions are combined to make a 30-minute
timer.
000000
T0001
T0002
TIM and CNT Instructions
In this example, a TIM instruction and a CNT instruction are combined to
make a 500-second timer.
TIM 0001 generates a pulse every 5 s and CNT 0002 counts these pulses.
The set value for this combination is the timer interval
case, the timer SV would be 5 s
long-term timer's PV is actually the PV of a counter, which is maintained
through power interruptions.
Start Count up
Clock Pulse and CNT Instruction
In this example, a CNT instruction counts the pulses from the 1-s clock pulse
to make a 700-second timer.
If the First Cycle Flag (A20011) is ORed with the counter's reset input
(CIO 000001), the counter's PV will be reset to the SV (0700) when program
execution begins rather than resuming the count from the previous PV.
Address Instruction Operands
000000 LD
000001 TIM
000002 LD
000003 TIM
000004 LD
000005 OUT
counter SV. In this
100 = 500 s. With this combination, the
Address Instruction Operands
000000 LD
000001 LD
000002 CNT
000003 LD
000004 AND NOT
000005 AND NOT
000006 TIM
000007 LD
000008 OUT
000009 LD
000010 OUT
Section 3-6
000000
0001
#9000
T0001
0002
#9000
T0002
000200
010000
000001
0002
#0100
000000
010000
C0002
0001
#0050
T0001
010000
C0002
000201
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