Introduction to Industrial Automation

Figure 10.19  Working time monitoring of a machine.

PS

M

Bucket

Components Groove

+24 VDC

+24 V DC

Pick-up rail Rotating disk Motor-vibrator

0 V

0 V

b

1

b

1

b

2

b

3

b

2

b

3

Start

PS

M

D

4

8

12

RS

0-1

RS

0-1

PLC

I1.0

I2.1

Q2.1

Q2.2

Q2.3

Q5.0

Q6.0

I2.2

I2.3

I3.0

I4.0

Inputs

Outputs

Number of components

Start

4

8

12

Figure 10.20  Feeder system of an assembly machine.

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Industrial Applications 

◾

 

399

  4. With a new START command, Step 3 is repeated, and so on.

  5. If during the disk rotation it is spent without feeding a component for 2 min, then the 

vibrator motor M is automatically switched on for 10 s (without stopping the rotation of 

the disc), which shakes the bucket and the components, and thus facilitates their collection 

by a blade.

  6. If during a feeding procedure (after START) a different number of components is selected, 

the system does not respond to this change. Only in the non-feeding phase (the disk does 

not rotate) can the desired number of components be changed.

If at any time the switch RS

0-1

 is opened, the system stops and all are reset.

Write the required PLC program in Boolean language.