Introduction to Industrial Automation

10.14   Chemical Cleaning Process of Metallic Objects

Figure 10.14 shows a tank for chemical cleaning of metallic objects. The basket with metallic 

objects must be immersed inside the tank several times according to the following plan. By instan-

taneously pressing the button b

0

, the basket must be immersed three times into the tank and to 

remain there for 20 seconds each time. Between the three immersions, the basket returns to its 

initial (up) position and goes down again without delay through the forward/reverse motor M

1

. 

After the third immersion, the basket returns to the up position and remains there until the next 

M

1

M

2

PC

2

PC

1

C

1

C

2

H

0 V

0 V

Inputs

Outputs

PC

2

+24 V DC

+24 V DC

PC

1

I1.0

Q0.0 Q0.2 Q0.4

PLC

I1.3