Скачать или смотреть PLC Programming Example Project - Batching Tank Ladder Logic PLC and HMI Tutorial

PLC Programming Example Project - Batching Tank Ladder Logic PLC and HMI Tutorial

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Generally speaking, there are two types of processes in manufacturing: discrete and analog. A discrete process is a manufacturing methodology that will produce separate widgets. In other words, a production line may output one item, two items, three items, etc. An analog production process is where the plant will create a quantity of product that is quantifiable by weight. Examples include the production of beverages, sauces, raw ingredients, etc. Although it is technically possible to design a flow that will continuously output the product, such production is often managed in batches. It is important to note that although batches are considered to be analog or continuous flow, most of them end up being packaged for consumption which converts them into a discrete manufacturing process.

A batch is a certain volume of product to be produced in a single run. Let us look at the simplest example of a batch:
A mixing tank has two infeed pipes coming from a source of water and sweet syrup respectively. An operator is able to open the flow of water or sweet syrup into the mixing tank.

In this case, a batch would be the action of creating a specific mixture of the two inputs in the mixing tank. For example, a batch can be defined as 5000 pounds of water and 200 pounds of sweet syrup. A different batch may contain 4500 pounds of water and 700 pounds of syrup. Note that although the total weight is the same in both cases, it may vary between batches.

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