Abstract
The concept of force is common in our life and there are many tools that can be used to measure force, such as spring balance, new balance, etc, these tools are very simple, although they are used conveniently, but not have high accuracy. And the pulling force which changes as long as its length change is difficult to measure, such as tape, the dog rope and so on.In this paper we make a study of the principle and method of tension tests, moreover, we do the tension test with a system which is constructed with PLC and touch screen, sensors, the A/D converter and stepping motor. In this system we designed a man-machine interface by touch screen, it can be operated simplify and have practical significance, what’s more it can be used to do product qualified inspection.
Key words: tension tests, PLC, touch screen, step motor