Introduction to Industrial Automation

Figure 4.12  The automation circuit of a machine with a three-speed motor as extracted from 

the state diagram of Figure 4.11.

S

0

S

1

x

S

2

x

x

00

01

11

Figure 4.13  Indirect transition from one state to another, for satisfaction of the “one-change 

each time” rule of state diagram design.

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Logical Design of Automation Circuits 

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state diagram will lead to a false automation circuit, which will cause the high speed rotation of 

the machine directly, with only one activation of the pushbutton. Let us demonstrate this situation 

through an example.