Introduction to Industrial Automation

Example 4.10:  A Drilling and Milling Machine Tool 

with Two Different in Duration Processes

Consider the complex machine shown in Figure 4.25, where a processed object of a production line 

undergoes two different treatments. The two treatments, which are performed via the operation of 

two corresponding motors M

1 

and M

2

, start simultaneously, but one of them lasts 20 s longer than 

the other. It is desired to design an automation circuit, so that an instant signal START will cause 

the simultaneous operation of the two motors, while an instant signal STOP will stop one motor 

immediately and the other motor after 20 s.