From the course: Learning PLC Ladder Logic: 2 Diving Deeper
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Common comparison instructions - Ladder Logic Tutorial
From the course: Learning PLC Ladder Logic: 2 Diving Deeper
Common comparison instructions
- [Instructor] The common conversion instructions that are used in PLC ladder logic programming are equal, not equal, greater than, greater than or equal, less than, less than or equal. The name of the instruction is written on the top of the block. An equal instruction is true whenever the source values for A and B are equal. Then the rung is true and the output turns on. An example is if the temperature reaches 50 degrees, a light turns on indicating that. Since compare instructions are input, so we can have as many other inputs required by the logic. For example, we can have a start push button. In this case, the red pilot light turns on only when the start push button is pressed, and the temperature equals 50. Both inputs need to be true. The not equal instruction is true whenever the source values are not equal. So in this case, whenever the temperature does not equal 50 degrees, the green pilot light turns on.…
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Contents
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Introduction to comparison instructions1m 24s
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(Locked)
Common comparison instructions1m 37s
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(Locked)
Example: Comparison instruction1m 1s
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(Locked)
Solution: Comparison instruction2m 21s
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(Locked)
Limit Comparison instruction1m 10s
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(Locked)
Example and solution 1: LIM1m 51s
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(Locked)
Example and solution 2: LIM2m 23s
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