The basic principle for selecting a PLC model is to choose the most reliable, convenient to maintain, and cost-effective optimal model, provided that its functions meet the requirements.
In situations where the process is relatively fixed and the environmental conditions are good (with a small amount of maintenance), it is recommended to choose a PLC with an integral structure; In other cases, it is best to choose a modular PLC structure.
For engineering projects with switch based control and a small amount of analog control, the control speed generally does not need to be considered. Therefore, selecting a low-end computer with A/D conversion, D/A conversion, addition and subtraction operations, and data transmission functions can meet the requirements.
In engineering projects with complex control and high requirements for control functions (such as PID calculation, closed-loop control, communication networking, etc.), medium or high-end machines can be selected based on the control scale and complexity. Among them, high-end machines are mainly used for large-scale process control, distributed control systems with full PLC, and automation of the entire factory.
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