At the end of this article, there are 55 practical case materials.
Introduction: In automated equipment, weight sensors are often used to detect whether materials are qualified. If qualified, they are packaged; if not, they are rejected. The weight sensor typically provides an analog signal to the PLC, which then evaluates the signal to determine if the material is qualified. So, how should this program be written?
Control Requirements:
There is a production line that requires weight detection for products, with a standard weight of 30g. A weight within plus or minus 2g is considered qualified, and automatic packaging must be implemented.
(1) The system runs when the start button is pressed.
(2) When the weight sensor (2-10V corresponding to 0-50g) detects an object, if it is not qualified, cylinder 2 is energized to reject it; if qualified, cylinder 1 is energized to proceed with packaging.
(3) After packaging 10 items, cylinder 3 is energized to implement the box-changing function.
1. Create a new DB data block.
3. Program Writing
Program segment 1 implements the system startup function (the stop button is normally closed).
Program segment 2 converts the analog value from the weight sensor into actual engineering units.
Program segment 3 determines which cylinder to actuate through comparison instructions. The action condition for cylinder 2 includes a greater than or equal to 1.0 to avoid cylinder 2 actuating when there is no weight, i.e., equal to 0.
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