From the course: Learning PLC Ladder Logic: 2 Diving Deeper
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Types of math instructions - Ladder Logic Tutorial
From the course: Learning PLC Ladder Logic: 2 Diving Deeper
Types of math instructions
- [Instructor] The type of operation is usually written at the top of the block to indicate what type of operation is currently used. For source A and source B fields, it can be an input rack location, file address, instruction field, or a constant. For the destination field, it can be an output location, file address, or an instruction field. In terms of operation of the math instruction, it happens every scan when the rung is true. So if we have addition, then it adds every scan when the rung is true. If there is an input in the rung, then as long as the input is true, the add operation works. These are the basic four mathematical functions performed by PLC. The operation of each math instruction is the same. They all have two sources and one destination, only depending on what is selected, the instruction works accordingly. In subtraction, the order of the two sources' value becomes important here. Source B is always…
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Contents
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Introduction to math instructions1m 25s
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Types of math instructions1m 40s
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Considerations with math instructions2m 49s
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Example: Convert Fahrenheit to Celsius40s
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Solution: Convert Fahrenheit to Celsius1m 52s
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Example: Use arithmetic instructions1m 12s
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Solution 1: Use arithmetic instructions2m 28s
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Solution 2: Use arithmetic instructions2m 52s
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ONS: One-shot instruction2m 9s
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Example: ONS with math instructions3m 22s
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