Bit Masking Tutorial - MEQ | Masked Equals Instruction PLC Programming Bit Manipulation Optimization

Bit Masking Tutorial - MEQ | Masked Equals Instruction PLC Programming Bit Manipulation Optimization

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The MEQ or the Masked Equals Instruction allows for efficient bit manipulation in PLC programming. This instruction was covered in one of our previous tutorials, but we've received many questions with regards to the functionality of MEQ and a request to incorporate it into an example.
In this tutorial, we will be looking at a PLC routine that is used for recipe manipulation. By using this logic, it's possible to switch between multiple valves that are required only in certain recipes and not in other ones.
Do note that the example is fairly basic to convey the point across. An actual recipe routine would include many more elements, fault checks, additional valves, an interface to an HMI and more. The goal of the demonstration is to demonstrate how the logic within the first implementation can be translated into a much more condensed and customizable version through the use of a bit-mask. Furthermore, note that this could have been implemented in a different manner; as always, there's more than one way to implement every functionality.
The most basic way of building a recipe control system begins with the user picking a recipe. In our case, we have a single rung of logic which is connected to a "virtual HMI" system. Through this system, the operator is able to select a recipe number that we've limited to 10.
Full Tutorial:
https://www.solisplc.com/tutorial/bit...

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