There is a bottle filling machine that fills the empty bottles on a conveyor belt with liquid from this tank. In this and the next lessons you’re going to learn how this machine works and how to write a professional PLC program that fully controls this machine.
This filling machine has three operation modes which are off, manual and automatic. These modes are determined by the three position selector switch.
Three position selector switches usually have one input and two outputs. The use of the terms input and output may be confusing but they should not be confused with inputs and outputs of PLC's. The term input refers to the power portion of the contacts that the switch contain while the outputs re...
Previously, I wrote code for controlling the signal lamps and also running the motor in the clockwise direction. In this lesson, I’m going to write code for running the motor in the counter clockwise direction.
In addition to sensor number 2, I have sensors at the two ends of the conveyer belt. As I previously said, I want sensor number 1 to count the number of empty bottles and sensor number 3 to count the number of filled bottles.
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