Allen-Bradley LOGIX 5000 Reference Manual page 550

Chapter 11 Common Attributes for Advanced Process Control and Drives Instructions
550
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x is the small incremented variable.
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y is the large incremented variable.
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z is the total current count that can be used anywhere.
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x = x+1;
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if x = 100,000;
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{
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y = y + 100,000;
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x = 0;
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}
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z = y + x;
Or another example:
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x = x + some_tiny_number;
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if (x >= 100)
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{
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z = z + 100;
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x = x - 100; // there might be a tiny remainder
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}
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018