Omron CP - PROGRAMMING MANUAL 05-2007 - Page 237

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Timer and Counter Instructions Section 3-5
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 (A200.11) is ORed with the counter’s reset input
(CIO 0.01), the counter’s PV will be reset to the SV (0700) when program exe-
cution begins rather than resuming the count from the previous PV.
Example 2:
Two-stage Counter
When an SV higher than 9999 is required, two counters can be combined as
shown in the following example. In this case, two CNT instructions are com-
bined to make a BCD counter with an SV of 20,000.
0.00
0.01
A200.11
C0001
000000 LD 0.00
000001 AND 1 s
000002 LD NOT 0.01
000005 LD
#700
C0001
000006 OUT 200.02
000004 CNT 0001
#700
200.02
000003 OR A200.11
Instruction OperandsAddress
P_1 s (1-s clock)
000000 LD 0.00
000001 AND 0.01
000002 LD NOT 0.02
000003 OR C0001
000004 OR C0002
000005 CNT 0001
#100
000006 LD C0001
000007 LD NOT 0.02
000008 CNT 0002
#200
000009 LD C0002
000010 OUT 200.03
0.00 0.01
0.02
#100
0.02
#200
200.03
Instruction OperandsAddress